DOCA0095EN

Opening, Closing, Resetting and Testing a Circuit Breaker with a Side Rotary Handle

Testing the Trip Mechanism with a Side Rotary Handle

CAUTION
HAZARD OF NUISANCE TRIPPING
Circuit breaker tests must only be done by qualified electrical personnel.
Failure to follow these instructions can result in injury or equipment damage.

When testing the trip mechanism, take precautions against:

  • Disrupting operations

  • Activating inappropriate alarms

  • Triggering unwanted actions

For example, tripping the circuit breaker with the push-to-trip button can lead to inappropriate fault indications or corrective actions (such as switching to an alternate power source).

There is no push-to-trip button on the door of a circuit breaker with a side rotary handle. To check the trip mechanism, the door must first be opened.

Follow these steps to test the trip mechanism.

Step

Action

Position

1

With the circuit breaker in the O (OFF) position, open the enclosure door. O (OFF)

O (OFF)

2

Turn the circuit breaker from the O (OFF) position to the I (ON) position.

The circuit breaker is ready for the test.

I (ON)

3

Press the push-to-trip button.

The circuit breaker trips.

Trip

4

Turn the circuit breaker from the Trip position to the O (OFF) position.

The circuit breaker is open.

O (OFF)

5

Close the door.

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