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How does a QO-GFI, QOB-GFI, HOM-GFI, or CHOM-GFI breaker work?
Product Line:
QO, QOB, HOM, CHOM MCB's
Environment:
MCB' Sold in North America
Resolution:
The GFCI sensor in a QWIK-GARD circuit breaker continuously monitors the current flow in the ungrounded "hot" load conductors and the neutral conductor. The sensor compares the current flow in all directions. If the current flowing back to the source is less than the current flowing out to the load, a ground fault exists. When the difference in current flow exceeds 6 mA, the sensor sends a signal to the solid state circuitry, which activates the ground trip solenoid mechanism and trips the circuit breaker. The trip will be indicated by the operating handle moving to the center tripped position on QO, QOB, HOM, and CHOM. In addition, on QO and QOB breakers, the trip will be indicated by the VISI-TRIP indicator.
On 2P, 15 A to 50 A, the GFI breaker will work with or without a load neutral wire. However, the breaker neutral pigtail must still be connected to the panel neutral.
On 2P, 60 A and all 3P (QO only), there is no load neutral wire connection on the breaker. Again, the breaker neutral pigtail must be connected to the panel neutral. The sensor compares the current flow in both directions and trips the breaker when more than a 6 mA imbalance occurs.
See the Instruction Bulletins at the links below:
1P QO-GFI: 48840-088-01
HOM/CHOM-GFI: 48840-090-01
2P QO-GFI: 48840-435-03
3P QO-GFI: 48840-260-01
QO, QOB, HOM, CHOM MCB's
Environment:
MCB' Sold in North America
Resolution:
The GFCI sensor in a QWIK-GARD circuit breaker continuously monitors the current flow in the ungrounded "hot" load conductors and the neutral conductor. The sensor compares the current flow in all directions. If the current flowing back to the source is less than the current flowing out to the load, a ground fault exists. When the difference in current flow exceeds 6 mA, the sensor sends a signal to the solid state circuitry, which activates the ground trip solenoid mechanism and trips the circuit breaker. The trip will be indicated by the operating handle moving to the center tripped position on QO, QOB, HOM, and CHOM. In addition, on QO and QOB breakers, the trip will be indicated by the VISI-TRIP indicator.
On 2P, 15 A to 50 A, the GFI breaker will work with or without a load neutral wire. However, the breaker neutral pigtail must still be connected to the panel neutral.
On 2P, 60 A and all 3P (QO only), there is no load neutral wire connection on the breaker. Again, the breaker neutral pigtail must be connected to the panel neutral. The sensor compares the current flow in both directions and trips the breaker when more than a 6 mA imbalance occurs.
See the Instruction Bulletins at the links below:
1P QO-GFI: 48840-088-01
HOM/CHOM-GFI: 48840-090-01
2P QO-GFI: 48840-435-03
3P QO-GFI: 48840-260-01
Released for:Schneider Electric USA
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