Specification

© 1998–2008 Schneider Electric
All Rights Reserved
QO
®
and QOB Miniature Circuit Breakers
Accessories
16
07/2008
Auxiliary Switch
The auxiliary switch accessory monitors the circuit breaker contact status and provides a remote signal
indicating whether the circuit breaker contacts are open or closed. When the circuit breaker is off or
tripped, the auxiliary switch with an “A” contact is open and the auxiliary switch with a “B” contact is
closed. When the circuit breaker is on, the auxiliary switch with an “A” contact is closed and the
auxiliary switch with a “B” contact is open.
Auxiliary switches are available for QO and QOB circuit breakers and miniature switches. (Auxiliary
switches are not available on QO and QOB AFI and CAFI products.)
Alarm Switch
The alarm switch accessory monitors the circuit breaker trip status and is used to provide a remote
warning signal indicating that the circuit breaker has tripped. This signal can be used in conjunction
with a horn, pilot light, or some other indicator.
The contact on the standard alarm switch is open when the circuit breaker is in the off or on position
and is closed when the circuit breaker is in the tripped position.
Alarm switches are actuated when the circuit breaker has tripped as a result of an overload, short
circuit or shunt trip operation. Alarm switches are available for QO and QOB circuit breakers and
miniature switches. (Alarm switches are not available on QO and QOB AFI and CAFI products.)
Figure 6: Auxiliary Switch Wiring Diagrams
Figure 7: Alarm Switch Wiring Diagram
"A" Contact
"B" Contact
"A" Contact
"B" Contact
A
A
Com
A
B
Power
B
Com
B
Power
A
07303109
Circuit Breaker OFF or Tripped
Circuit Breaker OFF or Tripped—Light B “On”
Circuit Breaker ON—Light A “On”
Circuit Breaker ON
C
BC
07303110
Circuit Breaker OFF or ON
Normally-open Alarm Switch Circuit Breaker Tripped