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| U-Series | Air Circuit Breakers Instruction Manual
For Operational Safety of Air Circuit Breakers
Safety Practices
This instruction manual applies only to U-Series air circuit breakers (ACB) regarding installation and maintenance procedures.
Installing and maintaining these products improperly may result in serious personal injury, property damage, or even death.
Therefore this instruction manual must be read and understood at any step in unpacking, assembly, operation, and maintenance of
the breaker. Only qualified persons who are familiar with installing and maintaining circuit breakers are permitted to work on breakers,
and this instruction manual should be accessible to those persons at any time.
Signal Words
Signal words used in this instruction manual are divided by DANGER, WARNING, and CAUTION depending on the situation.
Indicates an imminently hazardous point that, if ignored, a serious accident causing death or severe injury could occur.
DANGER
This is the most dangerous point.
WARNING
Indicates a potentially hazardous point that, if ignored, a serious accident causing death or severe injury could occur.
Indicates a potentially hazardous point that, if ignored, minor or moderate injury could occur.
CAUTION
This signal reminds operators to work safely.
Transportation Precaution
Never lift the ACB over an area where there are people.
DANGER
Naver stand under the ACB.
OCR Field Test Precautions
• OCR field tests and setting changes must be performed by qualified personnel.
CAUTION
• After completion of OCR tests, make sure to return the original values.
• Failure to do may cause a fire or burnout.
Operation Precautions
• Never touch live terminal parts.
DANGER
There is a risk of electric shock.
• Do not leave the ACB in the draw-out position.
Dropping the ACB cause serious injury.
• If the ACB trips open automatically, remove the cause before closing the ACB.
CAUTION
Otherwise, a fire could occur.
• For the ACB with the fixing block, be sure to loosen the block screws before drawing out the ACB.
Otherwise, damage to the ACB may occur.
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