Specification

QO
®
and QOB Miniature Circuit Breakers
Special Application Circuit Breakers
11
07/2008
© 1998–2008 Schneider Electric
All Rights Reserved
Two-Pole Qwik-Gard GFCIs
Two-pole Qwik-Gard GFCIs can be installed on a 120/240 Vac 1Ø3W system, the 120/240 Vac portion
of a 120/240 Vac 3Ø4W system, or two phases and neutral of a 208Y/120 Vac 3Ø4W system.
Regardless of the application, connections must be made to two “hot” busses and the panel neutral
assembly. When installed on these systems, protection is provided for two-wire 240 Vac or 208 Vac
circuit, three-wire 120/240 Vac or 208Y/120 Vac circuits and 120 Vac multiwire circuits.
The 60 A QO260GFI and QOB260GFI GFCIs are limited for use on 208 Vac and 240 Vac two-wire
systems. These GFCIs require the panel neutral connection to provide the 120 Vac power necessary
for testing the ground-fault circuitry.
Figure 3: Typical Two-Pole Qwik-Gard GFCI Wiring
N
AB
120/240 Vac Source
Hot B
Hot A
Equipment Ground
S/N
GND
120 V
240 V
Two-pole
Circuit Breaker
with
GFCI or EPD
120 V
240 V
250 V Duplex
Receptacle
07303103
Two-wire 240 Vac or 208 Vac
Equipment Ground
GND
S/N
120 V
N
AB
120/208 Vac or
120/240 Vac Source
Two-pole
Circuit Breaker
with
GFCI or EPD
Hot B
Neutral
Load
Hot A
120 V
240
V
Three-wire 120/240 Vac or 208Y/120 Vac Circuits
15–50 A Only
07303104
NB
120 V
120 V
Neutral
Duplex
Receptacle
Duplex
Receptacle
Two-pole
Circuit Breaker
with
GFCI or EPD
240 V
120 V
A
120/208 Vac or
120/240 Vac Source
Equipment Ground
Hot A
Hot B
S/N
GND
120 V
120 Vac Multiwire Circuits
15–50 A Only
07303105