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RCD & MCB Operations

RCD & MCB Operations. Residual Current Devices. RCD Operation. Test. Toroidal. Button. Transformer. Test. Resistor. I+If. I+If. Phase. Neutral. I+If. Tripping. Relay. Earth. Residual Current Devices. RCD Operation. Test. Toroidal. Button. Transformer. Test.

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RCD & MCB Operations

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  1. RCD & MCB Operations

  2. Residual Current Devices • RCD Operation Test Toroidal Button Transformer Test Resistor I+If I+If Phase Neutral I+If Tripping Relay Earth

  3. Residual Current Devices • RCD Operation Test Toroidal Button Transformer Test Resistor I+If I+If Phase Neutral I Tripping Relay Fault current path If Earth

  4. LOAD TERMINAL BRAIDED CONNECTION THERMAL (BI-METAL) OVERCURRENT RELEASE ACTUATING LINK OVERCURRENT CONTACT ACTUATING CLOSED CAM 'ON' CAM ARC RUNNER ON/OFF SWITCH SHOWN IN THE 'ON' POSITION ARC CHUTE (12 ARC SPLITTERS) CONTACT CARRIER HOLE FOR MCB LOCKING DEVICE SETTING LINK 'OFF' CAM SUPPLY TERMINAL ELECTROMAGNETIC RELEASE Miniature Circuit Breaker

  5. MCB’s • Operation – Switched On

  6. MCB’s • Operation - Overload

  7. Time/Current Graph Overload by thermal operation of MCB over a time period

  8. MCB’s • Operation – Switched On

  9. MCB’s • Operation – Short Circuit

  10. Time/Current Graph Overload by magnetic operation of MCB

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