Resetting the Circuit Breaker After a Trip Due to an Electrical Fault

Reset Procedure

DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH Do not re-close the circuit breaker on an electrical fault. First inspect and, if necessary, repair the downstream equipment. Failure to follow these instructions will result in death or serious injury.

The following table shows the sequence of actions to follow after a trip due to an electrical fault. Further explanation of each action is given in the following paragraphs.

Step	Action
1	Identify the trip cause.
2	Clear the electrical fault on the network.
3	Check the load.
4	Inspect the circuit breaker and switchboard after a short circuit.
5	Reset the circuit breaker.
6	Press the for 3 seconds to reset the latched events and switch off the trip cause LEDs and the status bar.
7	When the circuit breaker is ready-to-close, re-close it.

Identifying the Trip Cause

When the circuit breaker is tripped due to an electrical fault, the blue fault-trip reset button on the circuit breaker is popped out, and the trip cause is indicated by the status bar and the trip cause LEDs.

Description	Indication LEDs
Trip on long-time protection (L)		Ready LED: off Status bar: blinking red Service LED: off L trip cause LED: blinking red Other trip cause LEDs: off
Trip on short-time protection (S)		Ready LED: off Status bar: blinking red Service LED: off S trip cause LED: blinking red Other trip cause LEDs: off
Trip on instantaneous protection (I)		Ready LED: off Status bar: blinking red Service LED: off I trip cause LED: blinking red Other trip cause LEDs: off
Trip on ground-fault protection (G)		Ready LED: off Status bar: blinking red Service LED: off G trip cause LED: blinking red Other trip cause LEDs: off

Clearing the Electrical Fault

DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH Apply appropriate personal protective equipment (PPE) and follow safe electrical work practices. See NFPA 70E or CSA Z462 or local equivalent. This equipment must be installed and serviced by qualified electrical personnel. Turn off all power supplying this equipment before performing maintenance inspections.Assume that all circuits are live until they are de-energized, tested, grounded, and tagged. Consider all sources of power, including the possibility of backfeeding and control power. Always use a properly rated voltage sensing device to confirm that power is off. Replace all devices, doors, and covers before turning on power to this equipment. Beware of potential hazards and carefully inspect the work area for tools and objects that may have been left inside the equipment. Failure to follow these instructions will result in death or serious injury.

DANGER

HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH

Apply appropriate personal protective equipment (PPE) and follow safe electrical work practices. See NFPA 70E or CSA Z462 or local equivalent.
This equipment must be installed and serviced by qualified electrical personnel.
Turn off all power supplying this equipment before performing maintenance inspections.Assume that all circuits are live until they are de-energized, tested, grounded, and tagged. Consider all sources of power, including the possibility of backfeeding and control power.
Always use a properly rated voltage sensing device to confirm that power is off.
Replace all devices, doors, and covers before turning on power to this equipment.
Beware of potential hazards and carefully inspect the work area for tools and objects that may have been left inside the equipment.

Failure to follow these instructions will result in death or serious injury.

DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH Do not re-close the circuit breaker on an electrical fault. First inspect and, if necessary, repair the downstream equipment. Failure to follow these instructions will result in death or serious injury.

The feed must be isolated before inspecting the electrical equipment downstream of the protection.

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

Inspecting the Circuit Breaker after a Trip on Short Circuit

After a trip on short circuit due to short-time or instantaneous protection, the circuit breaker must be inspected for smoke deposits or cracks in the device casing.