Instruction manual

KRB-5377
5
1. SAFETY NOTICES
Thank you for purchasing the TERASAKI AR-series Air Circuit Breaker (TemPower2).
This chapter contains important safety information.
Be sure to carefully read these safety notices, instruction in this manual, and other documents accompanying the Air Circuit Breaker
(hereinafter referred to as the ACB) to familiarize yourself with safe and correct procedures or practices before installing, operating,
or servicing the ACB.
In this manual, safety notices are divided into “DANGER” and “CAUTION” according to the hazard level:
DANGER : A danger notice with this symbol indicates a potentially hazardous situation which, if not avoided, could result in
death or serious injury.
CAUTION
: A caution notice with this symbol indicates a potentially hazardous situation which, if not avoided, may result in
minor or moderate injury and/or property damage.
Note that failure to observe a caution notice could result in serious injury/damage in some situations. Because safety notices contain
important information, be sure to read and observe them.
 Transportation Precaution
DANGER
z Never stand under the ACB that has been lifted or suspended by a lifter or lifting attachments. The weight of the ACB may
cause serious injury.
 Installation Precautions
CAUTION
z Electrical work must be done by competent persons.
z Do not place the ACB in such an area that is subject to high temperatures, high humidity, dusty air, corrosive gases, strong
vibration and shock, or other unusual conditions. Mounting the ACB in such an area could cause a fire or malfunction.
z Be careful to prevent foreign objects (such as debris, concrete powder, dust, chippings, and iron powder) and oil or rainwater
from entering the ACB. These materials inside the ACB could cause a fire or malfunction.
z Prior to commencing any work on the ACB, open an upstream circuit breaker or the like to isolate all sources of
power/voltage. Otherwise, electric shock may result.
z Fix the draw-out cradle of the ACB firmly on a flat, level surface using mounting screws. Otherwise, the draw-out operation
may cause the breaker body or the draw-out cradle to fall, resulting in damage to the ACB or personal injury.
z Take care not to deform or bend protrusions in the bottom face of the draw-out cradle when fixing the draw-out cradle with
mounting screws. Deformation of the protrusions may cause a malfunction.
z Connect conductors (including screws) to the main circuit terminals in the specified area. Otherwise, a short-circuit may
result.
z When terminating conductors to the ACB, tighten terminal screws to the torque specified in this manual. Otherwise, a fire
could result.
z For 4-pole ACBs, be sure to connect a 3-phase, 4-wire neutral conductor to the N-phase pole (on the right end). Otherwise, an
overcurrent may hinder the ACB from tripping, resulting in a fire.
 Operation Precautions
DANGER
z Never touch live terminal parts. Doing so will result in electric shock.
z Do not leave the ACB body in the draw-out position. If the ACB body is accidentally dropped, its weight may cause serious
injury.
CAUTION
z Do not force down the charging handle after completion of manual charging operation. Doing so may cause a malfunction.
z The permissible operating voltage of the spring charging motor is 85 to 110% of the rated ac voltage or 75 to 110% of the rated
dc voltage. Be sure to supply a voltage within the above ranges to the motor. Otherwise, a malfunction, burnout, or fire may
result.