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

Opening and Closing with a Direct Rotary Handle

Task	Action
Open the circuit breaker.	Turn the rotary handle from the I (ON) position to the O (OFF) position.
Close the circuit breaker.	Turn the rotary handle from the O (OFF) position to the I (ON) position.

Resetting with the Direct Rotary Handle After a Trip

When the circuit breaker trips, the rotary handle moves from the I (ON) position to the Trip position.

CAUTION
HAZARD OF CLOSING ON ELECTRICAL FAULT Do not close the circuit breaker without first inspecting and, if necessary, repairing the downstream electrical equipment. Failure to follow these instructions can result in injury or equipment damage.

The fact that a circuit breaker has tripped does not fix the cause of the fault detected on the downstream electrical equipment.

Follow these steps to reset the circuit breaker after a trip caused by an electrical fault.

Step	Action		Position
1	Turn the rotary handle from the Trip position to the O (OFF) position. The circuit breaker resets and is open.		O (OFF)
2	Take precautions to protect yourself (see Taking Precautions Before Responding to a Trip).	—	O (OFF)
3	Look for the cause of the detected fault (see Identifying the Cause of the Trip).	—	O (OFF)
4	Clean and test the downstream equipment and the circuit breaker (see Checking Equipment After a Trip).	—	O (OFF)
5	Turn the rotary handle from the O (OFF) position to the I (ON) position. The circuit breaker is closed.		I (ON)

Testing the Trip Mechanism with a Direct 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).

Follow these steps to test the trip mechanism.

Step	Action
1	Turn the rotary handle from the O (OFF) position to the I (ON) position. The circuit breaker is closed.	I (ON)
2	Press the push-to-trip button. The handle moves from the I (ON) position to the (Trip) position. The circuit breaker is tripped.	(Trip)
3	Turn the rotary handle from the Trip position to the O (OFF) position. The circuit breaker is reset.	O (OFF)

Step

Action

Position

Turn the rotary handle from the O (OFF) position to the I (ON) position.

The circuit breaker is closed.

I (ON)

Press the push-to-trip button.

The handle moves from the I (ON) position to the (Trip) position. The circuit breaker is tripped.

(Trip)

Turn the rotary handle from the Trip position to the O (OFF) position.

The circuit breaker is reset.

O (OFF)