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Instructions for Installation, Operation and
Maintenance of Magnum SB Insulated Case
Low Voltage Power Circuit Breakers
EATON CORPORATION www.eaton.com
Instructional Leaet IB2C12063H03
Effective March 2012
1, 2 & 3 (NA)
4. ALL CONTACTS SHOWN WITH BREAKER IN OPEN POSITION AND WITH SPRING NOT CHARGED AND WITH TRIP UNIT IN
“NON-TRIPPED” STATE (OTS SWITCHES).
5. THE SPRING RELEASE ACCESSORY CONSISTS OF A “SR” COIL AND A P.C. BOARD. THE PRINTED CIRCUIT BOARD PROVIDES
A .20 SECOND PULSE FOR THE CLOSING OPERATION. VOLTAGE MUST BE REMOVED AND THEN REAPPLIED FOR SUBSEQUENT
OPERATION. AN OPTIONAL LATCH CHECK SWITCH (LCS) ACCESSORY MAY BE CONNECTED TO THE SPRING RELEASE. THE
(CLOSED) LCS DELAYS THE SPRING RELEASE PULSE UNTIL THE BREAKER MECHANISM IS READY TO CLOSE (CHARGED AND
RESET). (THIS WILL INSURE THAT THE LATCH WILL ALWAYS BE IN THE PROPER STATE BEFORE THE SPRING RELEASE PULSE IS
INITIATED). IF VOLTAGE IS MAINTAINED TO THE SPRING RELEASE, THE CLOSING PULSE WILL OCCUR WHEN THE MECHANISM
IS CHARGED AND RESET (LCS OPEN). VOLTAGE MUST BE REMOVED AND REAPPLIED TO THE SPRING RELEASE FOR SUBSE-
QUENT OPERATION.
6. TO PROVIDE SELECTED TIME DELAYS FOR SHORT TIME AND/OR GROUND TIME FUNCTIONS FOR TESTING OR NON-ZONE
INTERLOCKING APPLICATIONS, A JUMPER FROM B-8 TO B-9 IS REQUIRED.
7. ON THREE POLE BREAKERS ONLY, HAVING GROUND FAULT FUNCTIONALITY, A JUMPER INSTALLED FROM B-6 TO B-7 WILL
ENABLE SOURCE GROUND FAULT SENSING AND DISABLE RESIDUAL GROUND FAULT SENSING. INPUTS B-4 AND B-5 WILL BE
REASSIGNED FOR SOURCE GROUND SENSOR INPUTS.
8. (NA)
9. MOTOR OPERATOR SWITCH SHOWN WITH BREAKER CLOSING SPRING DISCHARGED.
10. ON 4-POLE BREAKERS, THE NEUTRAL CURRENT SENSOR IS THE SAME STYLE AND WIRED THE SAME AS THE PHASE SEN-
SORS AND IS LOCATED WITHIN THE BREAKER FRAME. THE SECONDARY CONTACTS B-4, B-5, ARE NOT WIRED OUT.
11. SECOND SHUNT TRIP MAY BE INSTALLED (USING A-7, A-8 CONTACTS) IN PLACE OF UVR. THIRD AUX SWITCH NOT AVAIL-
ABLE WITH SECOND SHUNT TRIP. SHUNT TRIP MAY BE STANDARD OR CONTINUOUS DUTY TYPE. SECONDARY WIRING IS
IDENTICAL.
12. ONLY ONE LATCH CHECK SWITCH MAY BE INSTALLED. USE OF CUSTOMER ACCESSIBLE LATCH CHECK SWITCH (B-28, B-29,
B-30) IN SERIES WITH SPRING RELEASE DEFEATS ANTI-PUMP FUNCTION AND IS NOT RECOMMENDED. SEE NOTE 5 FOR SPRING
RELEASE LATCH CHECK SWITCH.
13. THESE CONTACTS ARE PROVIDED FOR DIGITRIP 520M AS OPTIONAL ACCESSORY. THE CONTACTS ARE ASSIGNED FOR
GROUND ALARM ON GROUND TRIP FUNCTION FOR LSIG TRIP STYLE. HOWEVER, FOR A LSI STYLE TRIP UNIT, THE CONTACTS
ARE ASSIGNED AS A HIGH LOAD ALARM.
14. THE OTS (OVERCURRENT TRIP SWITCHES) WILL OPERATE DIRECTLY FROM THE DIGITRIP DRIVING THE TA (TRIP ACTUATOR)
TO TRIP THE CIRCUIT BREAKER. THE STANDARD OTS REQUIRES A MANUAL LOCAL RESET VIA RED BUTTON DEPRESSON. THE
AUTO RESET OTS DOES NOT REQUIRE MANUAL RESET, AND IF SO CONFIGURED, OCCUPIES THE MAKE-COM SECONDARY
TERMINALS A-4 AND A-5.
Figure 42. Connection Diagram for Narrow and Standard Frame with Digitrip 520 and 520M
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