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6.9 Troubleshooting
Fixed-
‘mounted
breaker
Draw-out
circuit
breaker
Disturbance Possible cause(s) Remedy
X X
Circuit breaker cannot be
closed.
Circuit breaker not ready to
close.
"Ready-to-close" indicator
shows:
1. Closing spring not charged Charge closing spring
X X
2. Undervoltage release not ener-
gized.
Energize undervoltage release
X X
3. Electrical closing interlock
effective
Switch off control voltage for
interlocking
X X
4. Key lock engaged
(optional accessory)
Unlock
X X
5. Padlocks installed
Remove padlocks
X X
6. "EMERGENCY OPEN" button
engaged in operating position
(accessories)
Release "EMERGENCY OPEN"
button by rotating it
X X
7. Lockout effective against closing
when cubicle door is open
(accessories)
Close cubicle door
X X
8. Electronic trip unit missing or
incorrectly installed
Install electronic trip unit properly
X X
9. Shunt trip energized
De-energize shunt trip
X
10. Racking handle withdrawn Rack circuit breaker into discon-
nected, test or connected position,
unlatch crank and push it fully in
X X
11. Closing coil energized
Closing coil has to be deenergized
shortly for reclosing
X X
12. Mutual mechanical circuit breaker
interlocks effective (accessories)
Open second circuit breaker or rack
into disconnected position
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