SQUARE D
SQUARE D QO370 70A 3 Pole 120/240V AC circuit breaker
Three-pole 70 A breaker rated 120/240 V AC with 10 kA interrupting, plug-in mounting for QO load centres and NQ panelboards
- 70 A three-phase protection for 120/240 V AC panels
- 10 kA interrupting rating handles high fault currents safely
- Plug-in mounting fits QO load centres and NQ panelboards directly
- Operates reliably down to 77 °F ambient temperature
- Compact 3.1 × 2.3 × 2.9 in frame saves panel space
QO370 70 A Three-Pole Breaker
The SQUARE D QO370 is a standard miniature circuit breaker rated at 70 A for 120/240 V AC systems. It mounts by plug-in into QO load centres and NQ panelboards. The unit carries a 10 kA interrupting rating at the rated AC voltage. It also supports 48 V DC circuits.
Three-Pole 120/240 V AC Rating
This breaker provides three poles for three-phase distribution at 120/240 V AC. The 70 A ampere rating is the single figure that determines whether the device matches the circuit design. Terminal lugs accept wire for the 100 A frame size.
Electricians Wiring QO Panels
The breaker suits electricians installing or maintaining QO-series load centres where a 70 A three-pole feeder is required. It does not suit panels that accept only bolt-on breakers or panels rated for a different interrupting capacity. Buyers needing a different ampere rating or pole count should select another model.
Highlights
- 70 A three-phase protection for 120/240 V AC panels
- 10 kA interrupting rating handles high fault currents safely
- Plug-in mounting fits QO load centres and NQ panelboards directly
- Operates reliably down to 77 °F ambient temperature
- Compact 3.1 × 2.3 × 2.9 in frame saves panel space
Specifications
| Brand | SQUARE D |
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Questions about this item
What does the 70 A rating mean once the breaker is installed in a panel?
The breaker will carry up to 70 A continuously and trip if the current exceeds that value, protecting the connected circuit in a QO load centre.
How does the 10 kA AIR rating at 120/240 V AC limit the breaker's use?
The breaker can safely interrupt fault currents up to 10 kA on a 120/240 V AC system; it must not be applied where available fault current exceeds that level.
What physical space and mounting style does the QO370 require in a load centre?
It uses a plug-in mounting style, fits QO series load centres, and measures 3.1 in long, 2.3 in wide and 2.9 in deep.
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