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# Learning Task 1 ## Basic Contactor Construction - Clapper type - Stationary contacts - Movable contacts - Magnet - Coil - Armature - Vertical lift type For a three-phase motor starter, the contactor requires three power contacts. A single power contact is connected in series with each line conduc...

# Learning Task 1 ## Basic Contactor Construction - Clapper type - Stationary contacts - Movable contacts - Magnet - Coil - Armature - Vertical lift type For a three-phase motor starter, the contactor requires three power contacts. A single power contact is connected in series with each line conductor to the motor (Figure 2). ## Three-pole, solenoid-operated contactor for a three-phase motor starter - Stationary contacts - Movable contacts - Pressure springs - Insulated contact assembly (movable) - Solenoid coil - Stationary electromagnet - Coil terminals - Magnet shading coils - Moving armature or plunger - Vertical motion ### Schematic Diagram - L1 - L2 - L3 - T1 - T2 - T3 - Contacts ## Overload Relay (OLR) You may see overload relay written as OLR, O/L relay, O.L. relay or simply OL. Figure 3 shows an OLR connected into a magnetic starter.