Typical Control Circuit
Typical Control Circuit-Electrically Operated SEM Control Circuit
Operation of Switch
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The switch closes if the closing springs have been charged electrically or manually.
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The closing circuit has continuity when the closing springs are charged, the switch is open and no continuous trip signal is applied. Applying a close signal energizes the close coil, Y2. It discharges the closing springs, closing the switch. When the switch closes. A5/a and A5/b change state.
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A5/a closing allows continuity in the trip circuit. A5/b opens, opening the close circuit.
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Applying a trip signal energizes the trip coil, Y1. It discharges the opening springs, opening the switch. When the switch opens, A5/a and A5b change state.
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Spare A5/a and A5/b contacts indicate the breaker state. A5/a closes when the switch closes. A5/b closes when the switch opens.
Legend
| F1 | Cartridge Fuse, KLM3 |
| K1 | Anti-Pump Relay |
| K2 | Control Relay |
| M | Charging Motor |
| 51, 53-56 | Switch Position Auxiliary Switch Contacts (A5/a) |
| 52, 57-59 | Switch Position Auxiliary Switch Contacts (A5/b) |
| 510, 11, 12 | Grounding Switch Position Auxiliary Switch Contacts |
| 513 | Load Break Switch Operating Lever Actuated Contact |
| 514 | Grounding Switch Operating Lever Actuated Contact |
| 515, 16 | Charging Limit Switch Contacts |
| 517 | End of Charge Motor Contact |
| 518, 19 | Blown/Missing Fuse Indiction/Interlock |
| 520 | Control Depress Contact |
| 521 | Lock Auxiliary Switch |
| TBM | Terminal Block |
| Y1 | Trip Coil |
| Y2 | Close Coil |
| 3 | Auxiliary Blown/Missing Fuse Relay (Instantaneous and TDE) |
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Switch shown in the open state with closing springs discharged.
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Grounding switch shown in the open state.
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Some terminal points not shown for simplicity.
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Switch wiring diagram is 44044-177.
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Destination wire markers without wire numbers are used in mechanism.
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Diodes are on DC control power module only.