To prevent any electrolytic risk between copper conductor or brass conductors and the back plate of the equipment, it is necessary to take precautions to isolate them one from the other. This can be done in several ways, for example by inserting between the conductor and the case a plated nickel washer or by using tinned terminations.
Most QO and QOB circuit breakers can be supplied with electrical accessories factory-installed on
one-, two- or three-pole circuit breakers. Electrical accessories are not available on AFCI circuit
breakers.
Handle accessories are also available for field installation on QO and QOB circuit breakers. All fieldinstalled handle accessories must be ordered separately.
Electrical Accessories
Only one electrical accessory can be installed per circuit breaker, and are factory-installed only. All
electrical accessories occupy one additional pole space. The proper suffix number must be added to
the circuit breaker catalog number to order an accessory. No field modification or field installation is
possible on electrical accessories.
Shunt Trip
The shunt trip is used to trip the circuit breaker from a remote location by using a tripping coil energized
from a separate circuit. When energized by a push-button or other pilot device, the shunt trip caused
the circuit breaker to trip. The handle moves to the tripped position and the Visi-Trip
indicator
appears. The trip coil has a coil clearing contact to break the coil circuit when the circuit breaker trips.
Shunt trips are available for QO and QOB circuit breakers only with standard control voltage ratings up
to 240 Vac or 24 Vdc. (Shunt trips are not available on QO and QOB GFCI, AFCI, EPD and miniature
switches.) Shunt trips operate at 75% or more of rated voltage.
Table 5: Factory-Installed Electrical Accessory Suffix Numbers
Accessory Description Voltage Coil
Burden
Max.
Load
Catalog
Suffix
Shunt Trip
Trips the circuit breaker from a remote location by means of a trip
coil energized from a separate circuit. All shunt trips will operate
at 75% or more of rated voltage.
• For use with momentary or maintained push button.
• Not available on QO-GF or QO-EPD circuit breakers.
• Shunt trip terminals accept (2) 14–12 AWG Cu leads.
12 Vac/dc
24 Vac/dc
60 VA
168 VA
— 1042
120 Vac
208 Vac
240 Vac
72 VA
228 VA
288 VA
— 1021
Auxiliary Switch
“A” Contact
Circuit breaker open—One contact only, opens when circuit
breaker is off or tripped. 5 A max at 120 Vac. 120 Vac — 5 A 1200
Auxiliary Switch
“B” Contact
Circuit breaker open—One contact only, closed when circuit
breaker is off or tripped. 5 A max at 120 Vac. 120 Vac — 5 A 1201
Alarm Switch
Used with control circuits and is actuated only when the circuit
breaker has tripped. Standard construction includes a normallyopen contact.
• Alarm switch terminals accept (2) 14–12 AWG Cu leads.
120 Vac — 5 A 2100
