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Table 8: Troubleshooting
Problem
Circuit breaker fails to close.
60
Symptoms
Closing spring will not automatically charge.
Closing coil or solenoid
(52SRC) fails to energize.
No sound of circuit
Closing springs charge,
breaker closing.
but circuit breaker does
not close.
Closing coil energizes.
Sound of circuit breaker
closing is heard but
circuit breaker contacts
do not close.
Possible causes and remedies
1. Secondary control circuit is de-energized or control
circuit fuses are blown. Check and energize or replace
if necessary.
2. Secondary disconnect contacts 15 or 16 are not
engaging. Check and replace if required.
3. Damage to wiring, terminals or connectors. Check and
repair as necessary.
4. Failure of charging motor (88). Replace if required.
5. Motor cut-off switch LS21 or LS22 fails to operate.
Replace if necessary.
6. Mechanical failure of operating mechanism. Check
and contact regional service centers, the factory or
telephone Siemens field service at
+1 (800) 347-6659 or +1 (919) 365-2200 outside
the U.S.
1. Secondary control circuit de-energized or control
circuit fuses blown. Correct as indicated.
2. No closing signal to secondary disconnect pin 13.
Check for continuity and correct protective relay logic.
3. Secondary disconnect contacts 13 or 15 are not
engaging. Check and correct as required.
4. Failure of anti-pump relay (52Y) contacts 21 to 22, 31
to 32 or 13 to 14. Check and replace as required.
5. Failure of close coil (solenoid) (52SRC). Check and
replace as required.
6. Auxiliary switch NC contacts 41 to 42 are open when
circuit breaker contacts are open. Check linkage and
switch. Replace or adjust as necessary.
7. Spring-charged switch LS9 NO contacts remain open
after springs are charged. Check and replace as
required.
1. Mechanical failure of operating mechanism. Check
and contact regional service centers, the factory or
telephone Siemens field service at +1 (800) 347-
6659 or +1 (919) 365-2200 outside the U.S.
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