Square D QO120AS Circuit Breaker
- 20
- 1 Pole
Quantity
Square D QO120AS 1 Pole Circuit Breaker
New
Quantity
Description
Square D QO120AS 1 Pole Circuit Breaker
The Square D QO120AS is a 1 Pole thermal magnetic molded case circuit breaker with a current rating of 20 Amps and a voltage rating of 120VAC. It has an interrupting rating of 10kAIC at 120V. The QO120AS features a plug-in connection type and includes long-time and instantaneous trip functions.
Specifications
Product FAQs
6 answersWhich panelboards and load centers are compatible with the QO120AS?
This plug-in breaker is designed for Square D QO series load centers, as well as NQ and legacy NQOD panelboards configured for plug-on breakers. It is not compatible with Homeline panels.
Can I use the QO120AS in a Square D Homeline panel?
No. Square D QO and Homeline series are not interchangeable. The QO120AS has a specific mounting clip designed only for QO bus bars and will not fit Homeline enclosures.
How does the plug-in connection work for the QO120AS?
The breaker features a snap-on design that attaches directly to the bus bar of a compatible QO panel. This allows for a tool-free line-side installation, unlike bolt-on QOB breakers that require mounting screws.
Does this breaker offer AFCI or GFCI protection?
No. The QO120AS is a standard thermal-magnetic breaker. It provides essential protection against overloads and short circuits but does not include Arc Fault (AFCI) or Ground Fault (GFCI) circuitry.
How does the thermal-magnetic trip mechanism operate?
The thermal-magnetic mechanism provides two layers of protection. A bimetallic strip provides a delayed trip for prolonged overloads, while an electromagnetic coil trips instantaneously during a short circuit.
What is the difference between QO and QOB breakers?
QO breakers, like the QO120AS, are plug-in style breakers typically used in residential load centers and some commercial panels. QOB breakers are the bolt-on equivalents designed for commercial panelboards where a bolted connection to the bus bar is required.
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