6 – 19
6.10 Troubleshooting
Draw-out
breaker
Disturbance Possible Cause(s) Remedy
X
Circuit breaker cannot be
closed.
Circuit breaker not ready to
close.
Ready-to-close indicator
shows:
1. Spring not charged Charge spring
X
2. Undervoltage release not
energized.
Energize undervoltage release
X
3. Mechanical open fuse lock-out
effective
For fused circuit breakers:
Replace defective fuses and press
reset button
X
4. Key lock engaged
(optional accessory)
Unlock
X
5. Padlocks installed
Remove padlocks
X
6. "EMERGENCY OPEN"
button engaged in operating
position (accessories)
Release "EMERGENCY OPEN"
button by rotating it
X
7. Lockout effective against closing
when cubicle door is open
(accessories)
Close cubicle door
X
8. Electronic trip unit missing or
incorrectly installed
Install electronic trip unit properly
X
9. Racking handle withdrawn Rack circuit breaker into disconnected,
test or connect position, unlatch crank
and push crank fully in
X
10. Mutual mechanical circuit breaker
interlocks effective (accessories)
Open second circuit breaker or rack
into disconnected position
To Next Page
Loading...
