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Installation Precautions
• Installation work must be performed by qualified personnel.
CAUTION
• Prior to commencing any installation work, open an upstream circuit breaker to shut off all sources of power.
Otherwise, electric shock may occur.
• Tighten terminal bolt up securely to the specified torque.
Otherwise, a fire may occur.
• Fix the draw-out cradle of the ACB firmly on a flat level surface using mounting screws.
Otherwise, draw-out operation may cause the ACB to fall.
• To ensure adequate arc space (insulation distance), avoid blocking the arc gas vents of the ACB.
Otherwise a burn may result from high temperature arc gas.
• Do not place the ACB in such as an area that is subject to high temperature, high humidity, dusty air,
corrosive gas, vibration and shock, or other unusual conditions.
Mounting in such area could cause a fire, non-tripping, or malfunction.
• Install the ACB to prevent dust, concrete powder, iron powder, and rainwater from entering the unit.
These materials could cause a fire or non-tripping.
• For the ACB with four poles, connect the neutral wire of a 3-phase, 4-wire cable to the N-phase pole
(on the right end).
Otherwise, an overcurrent may cause non-tripping resulting a fire.
Maintenance and Inspection Precautions
• ACB maintenance, inspection and/or parts replacement must be performed by qualified personnel.
CAUTION
• Prior to commencing any work on the ACB, open an upstream breaker or the like to isolate all sources of
power/voltage from both the primary and auxiliary circuits.
Otherwise, electric shock may result.
• Prior to commencing ACB internal inspection, make sure that the ACB is open and the closing spring is released.
Otherwise, fingers or tools could be pinched in the internal mechanism, resulting injury.
• Retighten the terminal screws periodically to the specified torque.
Otherwise, a fire could result.
• Be sure to reinstall the arc chamber if removed.
Failure to do so or incorrect installation of the arc chamber may result in a fire or burn.
• Do not touch ACB live parts (contacts in particular), or structural parts close to a live part immediately
after opening the ACB to stop supplying power.
Otherwise, remaining heat may cause burn or residual charged voltage may cause electric shock.
• Do not bring your hand or face close to the arc gas vent of the arc chute while the ACB is closed.
Otherwise, a burn may result from high-temperature arc gas blowing out of the arc gas vent
when the ACB trips open.
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