Siemens UL 1066 User Manual

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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 Racking handle withdrawn Rack circuit breaker into disconnected,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

Siemens UL 1066 Specifications

General

Brand	Siemens
Model	UL 1066
Category	Circuit breakers
Language	English