Podcast
Questions and Answers
What does the code abbreviation 'ABB' represent in EMU components?
What does the code abbreviation 'ABB' represent in EMU components?
- Buchholz Indication Relay
- Auxiliary Supply Rectifier
- Battery Isolating Switches
- Air Blast Circuit Breaker (correct)
Which component is represented by the abbreviation 'BIR'?
Which component is represented by the abbreviation 'BIR'?
- Battery Isolating Relay
- Buchholz Indication Relay (correct)
- Current Limit Relay
- Control Circuit Breaker
What is the function of the component denoted by the abbreviation 'EFRA 2'?
What is the function of the component denoted by the abbreviation 'EFRA 2'?
- Earth Fault Relay for Auxiliary Circuit (correct)
- Emergency Fault Relay
- Earth Monitoring Switch
- Electrical Failure Relay
What does the abbreviation 'CC 1' stand for in the context of EMU components?
What does the abbreviation 'CC 1' stand for in the context of EMU components?
The component represented by the abbreviation 'DVB' is responsible for which function?
The component represented by the abbreviation 'DVB' is responsible for which function?
Which of the following codes indicates an auxiliary supply device?
Which of the following codes indicates an auxiliary supply device?
What type of relay does the code 'CR' refer to in EMU components?
What type of relay does the code 'CR' refer to in EMU components?
Which component does 'EFRA 2' correlate with in functionality?
Which component does 'EFRA 2' correlate with in functionality?
What is the code for the Air Blast Circuit Breaker Relay?
What is the code for the Air Blast Circuit Breaker Relay?
What does the abbreviation 'BUD' represent in EMU components?
What does the abbreviation 'BUD' represent in EMU components?
What is the purpose of the Earth Fault Relay Power?
What is the purpose of the Earth Fault Relay Power?
Which component is associated with the Over Voltage Relay?
Which component is associated with the Over Voltage Relay?
What is the function of the Battery Earthing Switch?
What is the function of the Battery Earthing Switch?
What does the acronym 'EFRP' stand for?
What does the acronym 'EFRP' stand for?
What is the function of the 'Emergency Lighting Relay'?
What is the function of the 'Emergency Lighting Relay'?
What is the main purpose of a Surge Suppression Unit?
What is the main purpose of a Surge Suppression Unit?
Which switch is specifically used for the Main Compressor Governor?
Which switch is specifically used for the Main Compressor Governor?
Which of the following is a function of the 'Battery Charger Failure Relay'?
Which of the following is a function of the 'Battery Charger Failure Relay'?
Which of the following is NOT a designation used in this context?
Which of the following is NOT a designation used in this context?
What does the 'Starting Relay' do in a system?
What does the 'Starting Relay' do in a system?
What could be the role of the Aux.Circuit Earth Fault Relay?
What could be the role of the Aux.Circuit Earth Fault Relay?
Which relay is designed to protect against overload in transformers?
Which relay is designed to protect against overload in transformers?
Which component provides a path for electrical currents during faults?
Which component provides a path for electrical currents during faults?
Which of the following functions is performed by the ammeter rotary shunt?
Which of the following functions is performed by the ammeter rotary shunt?
Identify the switch used for tap changing contractors?
Identify the switch used for tap changing contractors?
What is the primary purpose of a 'Surge Diverter'?
What is the primary purpose of a 'Surge Diverter'?
What is the primary use of a series resistor for OVR?
What is the primary use of a series resistor for OVR?
Which component is responsible for cooling in the system?
Which component is responsible for cooling in the system?
Which item is associated with the function of monitoring zero voltage conditions?
Which item is associated with the function of monitoring zero voltage conditions?
For which governor is the 'Governor by Pass Switch for Control Governor' designated?
For which governor is the 'Governor by Pass Switch for Control Governor' designated?
What is the function of the component designated by the code 'ASR'?
What is the function of the component designated by the code 'ASR'?
Which component is indicated by the code 'BUD'?
Which component is indicated by the code 'BUD'?
The function of the relay represented by 'CBAR' is primarily to:
The function of the relay represented by 'CBAR' is primarily to:
Which of the following is designed to disconnect the battery quickly, as denoted by the code 'BIS'?
Which of the following is designed to disconnect the battery quickly, as denoted by the code 'BIS'?
What is the primary role of the relay coded 'EFR'?
What is the primary role of the relay coded 'EFR'?
The code 'DVB' corresponds to which component in the EMU setup?
The code 'DVB' corresponds to which component in the EMU setup?
What type of monitoring device is identified by the code 'BIR'?
What type of monitoring device is identified by the code 'BIR'?
The component with the code 'AFI to AFII' serves what purpose?
The component with the code 'AFI to AFII' serves what purpose?
Which component does 'CC 2' refer to in the EMU components?
Which component does 'CC 2' refer to in the EMU components?
The relay signified by the code 'CLR 1' is identified as which type of relay?
The relay signified by the code 'CLR 1' is identified as which type of relay?
Which component is associated with the function of an Over Voltage Relay?
Which component is associated with the function of an Over Voltage Relay?
Which of the following resistors is specifically designed for EFRP's auxiliary circuit?
Which of the following resistors is specifically designed for EFRP's auxiliary circuit?
What role does the Surge Suppression Unit play in electrical systems?
What role does the Surge Suppression Unit play in electrical systems?
Which device serves as a switch for battery earthing?
Which device serves as a switch for battery earthing?
Which resistors are associated with the series connection for Over Voltage Relay?
Which resistors are associated with the series connection for Over Voltage Relay?
What type of shunt does the code 'SH 1 to SH 4' refer to?
What type of shunt does the code 'SH 1 to SH 4' refer to?
Which component functions as a resistor for the earth fault relay?
Which component functions as a resistor for the earth fault relay?
Which code refers to an Auxiliary Circuit Earth Fault Relay?
Which code refers to an Auxiliary Circuit Earth Fault Relay?
Which component represents a permanent field divert resistor?
Which component represents a permanent field divert resistor?
Which designation is linked to a battery earthing switch resistor?
Which designation is linked to a battery earthing switch resistor?
Which component is used for the auxiliary compressor governor?
Which component is used for the auxiliary compressor governor?
What is the primary role of the No Volt Relay?
What is the primary role of the No Volt Relay?
Which switch is designated for the EFR A 1?
Which switch is designated for the EFR A 1?
What is the function of the Brake Relay?
What is the function of the Brake Relay?
Which code represents the switch for tap changing reactors?
Which code represents the switch for tap changing reactors?
Which relay is associated with transformer over load protection?
Which relay is associated with transformer over load protection?
Identify the function of the Rectifier Fan Proving Relay.
Identify the function of the Rectifier Fan Proving Relay.
Which code corresponds to the Motor Cut Out Switch for TM 3/4?
Which code corresponds to the Motor Cut Out Switch for TM 3/4?
What is the designation for the Static Battery Charger?
What is the designation for the Static Battery Charger?
Which item is used for controlling the operation of TM 1 & 2?
Which item is used for controlling the operation of TM 1 & 2?
What does the abbreviation 'OVR' stand for?
What does the abbreviation 'OVR' stand for?
Which component is utilized for surge suppression?
Which component is utilized for surge suppression?
Identify the component that serves as a switch for battery earthing.
Identify the component that serves as a switch for battery earthing.
Which of the following codes corresponds to the Earth Fault Relay for auxiliary circuits?
Which of the following codes corresponds to the Earth Fault Relay for auxiliary circuits?
What is the purpose of the component denoted by the abbreviation 'RPP'?
What is the purpose of the component denoted by the abbreviation 'RPP'?
Which of these correspond to the ammeter rotary shunt?
Which of these correspond to the ammeter rotary shunt?
Identify the code that represents a series resistor for Over Voltage Relay.
Identify the code that represents a series resistor for Over Voltage Relay.
What function does the device indicated by 'NC 1 to NC 4' perform?
What function does the device indicated by 'NC 1 to NC 4' perform?
Which resistor is specifically designated for Earth Resistor for EFRP?
Which resistor is specifically designated for Earth Resistor for EFRP?
What does the abbreviation 'SU' refer to in electrical components?
What does the abbreviation 'SU' refer to in electrical components?
What does the code abbreviation 'BCC 1' refer to in EMU components?
What does the code abbreviation 'BCC 1' refer to in EMU components?
Which of the following abbreviations denotes a type of relay used for current regulation?
Which of the following abbreviations denotes a type of relay used for current regulation?
What function does the code 'AFI to AFII' serve?
What function does the code 'AFI to AFII' serve?
Which of the following components is represented by the abbreviation 'ASR'?
Which of the following components is represented by the abbreviation 'ASR'?
The component identified by the code 'EFR' is primarily designed for what purpose?
The component identified by the code 'EFR' is primarily designed for what purpose?
Which component is indicated by the code 'CC 2'?
Which component is indicated by the code 'CC 2'?
What is the purpose of the component denoted by the abbreviation 'BUD'?
What is the purpose of the component denoted by the abbreviation 'BUD'?
Which of the following components is identified by the code 'DL'?
Which of the following components is identified by the code 'DL'?
What function does the relay represented by 'CLR 1' primarily serve?
What function does the relay represented by 'CLR 1' primarily serve?
The abbreviation 'EFRA 2' is associated with which functionality?
The abbreviation 'EFRA 2' is associated with which functionality?
Which switch is used specifically for the Main Compressor Governor?
Which switch is used specifically for the Main Compressor Governor?
What type of relay is associated with the code 'RFR'?
What type of relay is associated with the code 'RFR'?
Which component is represented by the abbreviation 'OL 6'?
Which component is represented by the abbreviation 'OL 6'?
The code 'MCS 1' corresponds to which switch type?
The code 'MCS 1' corresponds to which switch type?
What is the function of the component denoted by 'NVR'?
What is the function of the component denoted by 'NVR'?
Which switch corresponds to the auxiliary compressor governor?
Which switch corresponds to the auxiliary compressor governor?
What is the role of the 'Static Battery Charger', identified by the code 'SBC'?
What is the role of the 'Static Battery Charger', identified by the code 'SBC'?
Which component is associated with the 'Transformers Thermostat Relay'?
Which component is associated with the 'Transformers Thermostat Relay'?
What does the code 'K1' represent?
What does the code 'K1' represent?
What is the primary function of the 'Brake Relay' indicated by the code 'BR'?
What is the primary function of the 'Brake Relay' indicated by the code 'BR'?
Flashcards
ABB
ABB
Air Blast Circuit Breaker
ABR
ABR
Air Blast Circuit Breaker Relay
ARR
ARR
Air Blast Circuit Breaker Reset Relay
ABG
ABG
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ASR
ASR
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AFI to AFII
AFI to AFII
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BIS
BIS
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BIR
BIR
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BUD
BUD
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BF 1.2
BF 1.2
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BCC 1, BCC 2
BCC 1, BCC 2
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CF
CF
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CLR 1, CLR 2
CLR 1, CLR 2
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CBR
CBR
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CBAR
CBAR
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CC 1
CC 1
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CC 2
CC 2
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CCB
CCB
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CR
CR
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CG 1
CG 1
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CG 2
CG 2
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CCS
CCS
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DL
DL
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DVB
DVB
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DMH
DMH
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EFR
EFR
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EFRA 2
EFRA 2
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EAC
EAC
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EAS
EAS
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Over Voltage Relay
Over Voltage Relay
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ARS
ARS
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AS
AS
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EFRP
EFRP
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ETO
ETO
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HEFRP
HEFRP
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EFRA
EFRA
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NC 1 to NC 4
NC 1 to NC 4
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HOBA
HOBA
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PFD
PFD
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REFRP
REFRP
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ROVR
ROVR
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RPP
RPP
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REFRA 1
REFRA 1
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REFRA 2
REFRA 2
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RHOBA
RHOBA
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RPEFRA 1
RPEFRA 1
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RPEFRA 2
RPEFRA 2
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S
S
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SH 1 to SH 4
SH 1 to SH 4
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SU
SU
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Emergency Lighting Relay
Emergency Lighting Relay
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Governor Bypass Switch (Control Governor)
Governor Bypass Switch (Control Governor)
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Governor Bypass Switch (Equipment Governor)
Governor Bypass Switch (Equipment Governor)
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Governor Bypass Switch (Main Compressor Governor)
Governor Bypass Switch (Main Compressor Governor)
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Governor Bypass Switch (Auxiliary Compressor Governor)
Governor Bypass Switch (Auxiliary Compressor Governor)
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Switch for EFRA 2
Switch for EFRA 2
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Switch for EFRA 1
Switch for EFRA 1
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Reversing Switch for TM 1 & 2
Reversing Switch for TM 1 & 2
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Reversing Switch for TM 3 & 4
Reversing Switch for TM 3 & 4
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Radiator Fans
Radiator Fans
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Surge Diverter
Surge Diverter
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Low Tension Proving Relay
Low Tension Proving Relay
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Motor Contactors (M 1 to M 4)
Motor Contactors (M 1 to M 4)
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Static Battery Charger
Static Battery Charger
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Battery Charger Failure Relay
Battery Charger Failure Relay
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Motor Cut Out Switch for TM 1/2
Motor Cut Out Switch for TM 1/2
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Motor Cut Out Switch for TM 3/4
Motor Cut Out Switch for TM 3/4
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Motor Switch White Light
Motor Switch White Light
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Master Controller
Master Controller
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Notching Relay (NR 1, NR 2)
Notching Relay (NR 1, NR 2)
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No Volt Relay
No Volt Relay
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Over Load Relay for TM 1 to 4 (OL 1 to OL 4)
Over Load Relay for TM 1 to 4 (OL 1 to OL 4)
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Rectifier Over Load Protection Relay (OL 5)
Rectifier Over Load Protection Relay (OL 5)
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Transformer Over Load Protection Relay (OL 6)
Transformer Over Load Protection Relay (OL 6)
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Over Load Primary Relay (OLP)
Over Load Primary Relay (OLP)
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Oil Pump (OP)
Oil Pump (OP)
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Rectifier Fan (RF)
Rectifier Fan (RF)
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Rectifier Fan Proving Relay (RFR)
Rectifier Fan Proving Relay (RFR)
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Rectifier Fan Auxiliary Relay (RFA)
Rectifier Fan Auxiliary Relay (RFA)
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Smoothening Reactor (SL)
Smoothening Reactor (SL)
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Starting Relay (SR)
Starting Relay (SR)
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Tap Changing Contactors (T 1 to T 9)
Tap Changing Contactors (T 1 to T 9)
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Tap Changing Reactor (TL)
Tap Changing Reactor (TL)
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Test Sequence Switch (TSS)
Test Sequence Switch (TSS)
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Transformer Thermostat (TT)
Transformer Thermostat (TT)
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Transformer Thermostat Relay (TTR)
Transformer Thermostat Relay (TTR)
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Winding Grouping (W1)
Winding Grouping (W1)
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Switch Contactors (W2)
Switch Contactors (W2)
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Winding Grouping Relay (WGR)
Winding Grouping Relay (WGR)
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Brake Relay (BR)
Brake Relay (BR)
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Ammeter (A)
Ammeter (A)
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Aux. Overvoltage Relay (AOVR)
Aux. Overvoltage Relay (AOVR)
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Air Blast Circuit Breaker (ABB)
Air Blast Circuit Breaker (ABB)
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Air Blast Circuit Breaker Relay (ABR)
Air Blast Circuit Breaker Relay (ABR)
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Air Blast Circuit Breaker Reset Relay (ARR)
Air Blast Circuit Breaker Reset Relay (ARR)
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Air Blast Governor (ABG)
Air Blast Governor (ABG)
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Auxiliary Supply Rectifier (ASR)
Auxiliary Supply Rectifier (ASR)
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Auxiliary Fuses (AFI to AFII)
Auxiliary Fuses (AFI to AFII)
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Battery Isolating Switches (BIS)
Battery Isolating Switches (BIS)
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Buchholz Indication Relay (BIR)
Buchholz Indication Relay (BIR)
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Buchholz Device (BUD)
Buchholz Device (BUD)
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Battery Fuses (BF 1.2)
Battery Fuses (BF 1.2)
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Battery Charging Contactors (BCC 1, BCC 2)
Battery Charging Contactors (BCC 1, BCC 2)
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Control Fuse (CF)
Control Fuse (CF)
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Current Limit Relay (CLR 1, CLR 2)
Current Limit Relay (CLR 1, CLR 2)
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Current Balance Relay (CBR)
Current Balance Relay (CBR)
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Current Balance Auxiliary Relay (CBAR)
Current Balance Auxiliary Relay (CBAR)
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Main Compressor Contactor (CC 1)
Main Compressor Contactor (CC 1)
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Auxiliary Compressor Contactor (CC 2)
Auxiliary Compressor Contactor (CC 2)
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Control Circuit Breaker (CCB)
Control Circuit Breaker (CCB)
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Emergency Lighting Relay
Emergency Lighting Relay
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Governor Bypass Switch (Control Governor)
Governor Bypass Switch (Control Governor)
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Governor Bypass Switch (Equipment Governor)
Governor Bypass Switch (Equipment Governor)
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Governor Bypass Switch (Main Compressor Governor)
Governor Bypass Switch (Main Compressor Governor)
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Governor Bypass Switch (Auxiliary Compressor Governor)
Governor Bypass Switch (Auxiliary Compressor Governor)
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Switch for EFRA 2
Switch for EFRA 2
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Switch for EFRA 1
Switch for EFRA 1
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Reversing Switch for TM 1 & 2
Reversing Switch for TM 1 & 2
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Reversing Switch for TM 3 & 4
Reversing Switch for TM 3 & 4
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Radiator Fans
Radiator Fans
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Surge Diverter
Surge Diverter
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Low Tension Proving Relay
Low Tension Proving Relay
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Motor Contactors (M 1 to M 4)
Motor Contactors (M 1 to M 4)
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Over Voltage Relay
Over Voltage Relay
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ARS
ARS
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AS
AS
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EFRP
EFRP
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ETO
ETO
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HEFRP
HEFRP
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EFRA
EFRA
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NC 1 to NC 4
NC 1 to NC 4
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HOBA
HOBA
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PFD
PFD
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REFRP
REFRP
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ROVR
ROVR
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RPP
RPP
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REFRA 1
REFRA 1
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REFRA 2
REFRA 2
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RHOBA
RHOBA
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RPEFRA 1
RPEFRA 1
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RPEFRA 2
RPEFRA 2
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S
S
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SH 1 to SH 4
SH 1 to SH 4
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SU
SU
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ABB
ABB
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ABR
ABR
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ARR
ARR
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ABG
ABG
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ASR
ASR
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AFI to AFII
AFI to AFII
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BIS
BIS
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BIR
BIR
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BUD
BUD
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BF 1.2
BF 1.2
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BCC 1, BCC 2
BCC 1, BCC 2
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CF
CF
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CLR 1, CLR 2
CLR 1, CLR 2
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CBR
CBR
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CBAR
CBAR
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CC 1
CC 1
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CC 2
CC 2
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CCB
CCB
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CR
CR
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CG 1
CG 1
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CG 2
CG 2
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CCS
CCS
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DL
DL
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DVB
DVB
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DMH
DMH
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EFR
EFR
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EFRA 2
EFRA 2
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EAC
EAC
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EAS
EAS
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Emergency Lighting Relay
Emergency Lighting Relay
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Governor Bypass Switch (Control Governor)
Governor Bypass Switch (Control Governor)
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Governor Bypass Switch (Equipment Governor)
Governor Bypass Switch (Equipment Governor)
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Governor Bypass Switch (Main Compressor Governor)
Governor Bypass Switch (Main Compressor Governor)
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Governor Bypass Switch (Auxiliary Compressor Governor)
Governor Bypass Switch (Auxiliary Compressor Governor)
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Switch for EFRA 2
Switch for EFRA 2
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Switch for EFRA 1
Switch for EFRA 1
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Reversing Switch for TM 1 & 2
Reversing Switch for TM 1 & 2
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Reversing Switch for TM 3 & 4
Reversing Switch for TM 3 & 4
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Radiator Fans
Radiator Fans
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Surge Diverter
Surge Diverter
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Low Tension Proving Relay
Low Tension Proving Relay
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Motor Contactors (M 1 to M 4)
Motor Contactors (M 1 to M 4)
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Static Battery Charger
Static Battery Charger
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Battery Charger Failure Relay
Battery Charger Failure Relay
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Motor Cut Out Switch for TM 1/2
Motor Cut Out Switch for TM 1/2
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Motor Cut Out Switch for TM 3/4
Motor Cut Out Switch for TM 3/4
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Motor Switch White Light
Motor Switch White Light
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Master Controller
Master Controller
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Notching Relay (NR 1, NR 2)
Notching Relay (NR 1, NR 2)
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No Volt Relay
No Volt Relay
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Over Load Relay for TM 1 to 4 (OL 1 to OL 4)
Over Load Relay for TM 1 to 4 (OL 1 to OL 4)
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Oil Pump (OP)
Oil Pump (OP)
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Rectifier Fan (RF)
Rectifier Fan (RF)
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Over Voltage Relay
Over Voltage Relay
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ARS
ARS
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AS
AS
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EFRP
EFRP
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ETO
ETO
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HEFRP
HEFRP
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EFRA
EFRA
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NC 1 to NC 4
NC 1 to NC 4
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HOBA
HOBA
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PFD
PFD
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REFRP
REFRP
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ROVR
ROVR
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RPP
RPP
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REFRA 1
REFRA 1
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REFRA 2
REFRA 2
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RHOBA
RHOBA
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RPEFRA 1
RPEFRA 1
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RPEFRA 2
RPEFRA 2
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S
S
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SH 1 to SH 4
SH 1 to SH 4
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SU
SU
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Study Notes
EMU Components Code Abbreviations
- ABB: Air Blast Circuit Breaker
- ABR: Air Blast Circuit Breaker Relay
- ARR: Air Blast Circuit Breaker Reset Relay
- ABG: Air Blast Governor
- ASR: Auxiliary Supply Rectifier
- AFI to AFII: Auxiliary Fuses
- BIS: Battery Isolating Switches
- BIR: Buchholz Indication Relay
- BUD: Buchholz Device
- BF 1.2: Battery Fuses
- BCC 1, BCC 2: Battery Charging Contactors
- CF: Control Fuse
- CLR 1, CLR 2: Current Limit Relay
- CBR: Current Balance Relay
- CBAR: Current Balance Auxiliary Relay
- CC 1: Main Compressor Contactor
- CC 2: Auxiliary Compressor Contactor
- CCB: Control Circuit Breaker
- CR: Compressor Relay
- CG 1: Main Compressor Governor
- CG 2: Auxiliary Compressor Governor
- CCS: Control Changeover Switch
- DL: Dropping Reactor
- DVB: Drivers Brake Valve
- DMH: Dead Man's Handle
- EFR: Earth Fault Relay
- EFRA 2: Earth Fault Relay for Auxiliary Circuit
- EAC: Earthing Contactor
- EAS: Earthing Switch
- ELR: Emergency Lighting Relay
- GS 1: Governor by Pass Switch for Control
- GS 2: Governor by Pass Switch for Equipment
- GS 3: Governor by Pass Switch for Main Compressor Governor
- GS 4: Governor by Pass Switch for Auxiliary Compressor Governor
- HEFRA 2: Switch for EFR A 2
- HEFRA 1: Switch for EFR A 1
- K1: Reversing Switch for TM 1 & 2
- K2: Reversing Switch for TM 3 & 4
- KF 1, KF 2: Radiator Fans
- LA: Surge Diverter
- LTR: Low Tension Proving Relay
- M 1 to M 4: Motor Contactors
- SBC: Static Battery Charger
- BCFR: Battery Charger Failure Relay
- MCS 1: Motor Cut Out Switch for TM 1/2
- MCS 2: Motor Cut Out Switch for TM 3/4
- MSWL: Motor Switch White Light
- MC: Master Controller
- NR 1, NR 2: Notching Relay
- NVR: No Volt Relay
- OL 1 to OL 4: Over Load Ready for TM 1 to 4
- OL 5: Rectifier Over Load Protection Relay
- OL 6: Transformer Over Lead Protection Relay
- OLP: Over Load Primary Relay
- OP: Oil Pump
- RF: Rectifier Fan
- RFR: Rectifier Fan Proving Relay
- RFA: Rectifier Fan Auxiliary Relay
- SL: Smoothening Reactor
- SR: Starting Relay
- T 1 to T 9: Tap Changing Contactors
- TL: Tap Changing Reactor
- TSS: Test Sequence Switch
- TT: Transformer Thermostat
- TTR: Transformer Thermostat Relay
- W1: Winding Grouping
- W2: Switch Contactors
- WGR: Winding Grouping Relay
- BR: Brake Relay
- A: Ammeter
Additional EMU Components
- AOVR: Auxiliary Over Voltage Relay
- ARS: Ammeter Rotary Shunt
- AS: Ammeter Shunt
- EFRP: Earth Fault Relay Power
- ETO: Earth
- HEFRP: Switch for Earth Fault Relay Power
- EFRA: Earth Fault Relay, Auxiliary Circuit
- NC 1 to NC 4: Negative Contactors
- HOBA: Earthing Switch for Battery
- OVR: Over Veltage Relay
- PFD: Permanent Field Divert Resistor
- REFRP: Resistor For EFRP
- ROVR: Series Resistor for OVR
- RPP: Earth Resistor for EFRP
- REFRA 1: Earth Resistor for EFRP Aux. 1
- REFRA 2: Earth Resistor for EFRP Aux. 2
- RHOBA: Resistor for Battery earthing switch
- RPEFRA 1: Resistor for EFR Aux. 1
- RPEFRA 2: Resistor for EFR Aux. 2
- S: Speedometer
- SH 1 to SH 4: Inductive Shunt for Motor 1 to Motor 4
- SU: Surge Suppression Unit
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