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Questions and Answers
The maximum switched current DC at 250 V is 1.0 A.
False
The AC dielectric strength between opened contacts is 2,500 V.
False
Normally closed (NC) dry-reed magnetic switches can switch a maximum voltage of 250 V.
True
The minimum switched current at the lowest voltage for normally open switches is 75 mA.
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Both normally closed and normally open dry-reed magnetic switches have the same AC switching capacity.
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The ambient temperature range for operation is from -50°C to +60°C.
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The switching operations for both types of dry-reed switches are rated at 10,000 cycles.
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The maximum switched current AC at the highest voltage for normally open switches is 2.0 A.
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The DC switching capacity for normally closed switches ranges from 1.2 W to 200 W.
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For normally closed switches, the maximum switching current at 125 V is 1.6 A.
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Disposal guidelines for electrically trained persons require them to handle all materials without protective equipment.
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Tripping circuit configurations are solely the responsibility of the operator without oversight from electrically skilled persons.
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Operational accuracy standards mandate that operators have no training on potential dangers from improper handling.
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Technical specifications indicate that maintenance can be performed by any personnel, regardless of training.
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Electrical data analysis is performed exclusively by maintenance personnel who do not require any oversight.
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The presence of damaged personal protective equipment is acceptable during high-risk tasks as long as typical procedures are followed.
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Only authorized personnel are permitted to carry out special maintenance as per technical specifications.
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Operators require independent certification to operate the product without guidance from technically skilled personnel.
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The protective relay must be tested while the transformer is energized.
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When connecting the protective conductor, it should be attached to the cylinder head screw.
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The terminal box cover should be loosened before securing it with screws during the mounting process.
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Grounding for work connection on the transformer should be removed during testing of the protective relay.
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Connection terminals should be connected according to a specified connection diagram.
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The automatic fire extinguishing device must be activated before testing the protective relay.
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Protective guidelines indicate that cables should be secured before inserting the protective cover.
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Technical specifications for the protective relay include models like RS 2001 and 2003.
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Study Notes
Electrical Data for Dry-Reed Magnetic Switches
Normally Closed (NC) Switch
- DC Switching Capacity: Ranges from 1.2 W to 200 W.
- AC Switching Capacity (50 Hz): Ranges from 1.2 VA to 400 VA.
- Switching Voltage (AC/DC): Operates between 24 V and 250 V.
- Switched Current (AC/DC): Ranges from 4.8 mA to 2 A.
- Minimum Switched Current (24 V): 50 mA (low voltage).
- Minimum Switched Current (250 V): 4.8 mA (high voltage).
- Maximum Switched Current DC (125 V): 1.6 A (with L/R = 40 ms).
- Maximum Switched Current DC (250 V): 0.9 A (with L/R = 40 ms).
- Maximum Switched Current AC (125 V): 2 A (with cos φ = 0.6).
- Maximum Switched Current AC (250 V): 1.6 A (with cos φ = 0.6).
- Switching Operations: Rated for 1,000 cycles.
Normally Open (NO) Switch
- DC Switching Capacity: Ranges from 1.2 W to 250 W.
- AC Switching Capacity (50 Hz): Ranges from 1.2 VA to 400 VA.
- Switching Voltage (AC/DC): Operates between 24 V and 250 V.
- Switched Current (AC/DC): Ranges from 4.8 mA to 2 A.
- Minimum Switched Current (24 V): 50 mA (low voltage).
- Minimum Switched Current (250 V): 4.8 mA (high voltage).
- Maximum Switched Current DC (125 V): 2 A (with L/R = 40 ms).
- Maximum Switched Current DC (250 V): 1 A (with L/R = 40 ms).
- Maximum Switched Current AC (125 V): 2 A (with cos φ = 0.6).
- Maximum Switched Current AC (250 V): 1.6 A (with cos φ = 0.6).
- Switching Operations: Rated for 1,000 cycles.
Dielectric Strength
- AC Dielectric Strength (Voltage Connections to Ground): 2,500 V at 50 Hz for 1 minute.
- AC Dielectric Strength (Opened Contacts): 2,000 V at 50 Hz for 1 minute.
Ambient Conditions
- Ambient Temperature Range: Operating from -40°C to +50°C.
Mounting Instructions
- Connection: Connect cables to terminals per the provided connection diagram.
- Protective Conductor: Attach to the cylinder head screw.
- Protective Cover: Insert and secure with screws.
- Wire Management: Position wires for terminal box cover and affix securely.
Protective Relay Checks
- Grounding: Ground transformer on both high and low voltage sides before testing.
- De-energization: Ensure transformer is de-energized during testing.
- Fire Safety: Deactivate automatic fire extinguishing system prior to testing.
Personnel Guidance
- Electrically Trained Persons: Should work under the guidance of qualified personnel, following safety protocols and instructions.
- Operator Responsibilities: Operators need proper instruction and training on equipment handling.
- Technical Service Recommendations: Maintenance, repairs, and upgrades should be conducted by authorized Technical Service department to ensure safety and correctness.
- Authorized Personnel: Must be trained by the manufacturer for special maintenance tasks.
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Description
This quiz covers the electrical specifications and functionalities of normally closed (NC) dry-reed magnetic switches. It includes information on switching capacities for both AC and DC, as well as voltage and current ratings. Test your knowledge on important electrical data essential for working with these switches.
