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Compact® NSF and NSJ 150 to 600 A Circuit Breakers
Section 9—Accessories
© 1995–2003 Schneider Electric All Rights Reserved
28
AUXILIARY AND ALARM SWITCHES
Changeover
Switches
Auxiliary switches provide remote information of the circuit breaker status and can thus be used for
indications, electrical locking, relays, etc.
Functions • OF (open/closed): auxiliary switch—indicates position of the circuit breaker contacts
• SD (trip indication): bell alarm—indicates that the circuit breaker has tripped due to
— Overload
— Short circuit
— Ground fault
— The operation of a shunt trip or undervoltage trip or the "push-to-trip" button which resets when
the circuit breaker is reset
• Operation of a plug-in base or chassis when attempting to withdraw the circuit breaker in ON
position; SDE (fault indication): indicates the circuit breaker has tripped due to an overload, short
circuit or ground fault; resets when circuit breaker is reset
• CAM (early-make or early-break function): indicates the position of the rotary handle; used in
particular for advanced-opening safety trip devices
• Connected/disconnected: indicates the position of a drawout circuit breaker
• Switching of very low loads: all above auxiliary switches are also available in low-level versions
capable of switching very low loads (e.g., for controlling PLCs or electronic circuits)
Standards Auxiliary switches comply with UL 489, CSA C22.2 No. 5.1 and IEC 947-5 Standards. “Low-level"
switches are not UL Listed.
Installation • Functions OF, SD and SDE:
— Switches snap into cavities under front accessory cover of the circuit breaker
— For Compact
®
NSF150–NSJ600 circuit breakers, one model serves for all indication functions
depending on where it is fitted in the circuit breaker
• SDE function of a circuit breaker equipped with a thermal-magnetic trip unit requires the SDE
actuator
• CAM: to be fitted in the rotary handle module; depending on how it is installed, it ensures either the
CAO (early-break) or the CAF (early-make) function "Connected/disconnected" function; two parts
to be fitted on the chassis and the drawout circuit breaker
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