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Square D QOU370 three-pole miniature circuit breaker with toggle actuator and slotted box lug terminals

SQUARE D

SQUARE D QOU370 Circuit Breaker 70A 3 Pole 120/240V AC

SKU CH-S1HX-EWZDJ

Three-pole miniature circuit breaker rated 70 A at 120/240 V AC with 10 kA interrupting capacity, compatible with QO load centres

  • 70 A three-pole protection for 120/240 V AC circuits
  • 10 kA interrupting rating handles high fault currents
  • 60 V DC rating adds low-voltage versatility
  • Slotted box lug accepts line or load in either direction
  • 1 in frame fits QO panelboards and DIN rail

Application fit

The SQUARE D QOU370 is a 70 A three-pole miniature circuit breaker rated for 120/240 V AC and 60 V DC. It belongs to the QO series and is designed for surface or DIN rail mounting in compatible QO load centres. The toggle actuator provides clear on/off indication. Its slotted box lug terminals accept reversible line and load connections. The unit carries a 10 kA interrupting rating at the rated AC voltage.

Build integration

Installation requires a QO-series panelboard or load centre that accepts the 100 A frame size. The 4.1 in length fits standard QO mounting spaces without additional hardware. Three poles protect three-phase circuits or multi-wire branch circuits in a single device. The standard trip curve suits general-purpose branch-circuit protection for air-conditioning, refrigeration and heating loads.

Who should choose it

Electrical contractors and facility managers needing a new 70 A three-pole breaker for existing QO equipment will find this unit matches the required frame and interrupting rating. Buyers using non-QO panelboards or requiring a different pole count, amperage or mounting style should look elsewhere. Those needing higher interrupting capacity or specialised trip curves must select a different series.

Highlights

  • 70 A three-pole protection for 120/240 V AC circuits
  • 10 kA interrupting rating handles high fault currents
  • 60 V DC rating adds low-voltage versatility
  • Slotted box lug accepts line or load in either direction
  • 1 in frame fits QO panelboards and DIN rail

Specifications

BrandSQUARE D

Questions about this item

What is the maximum interrupting rating of the QOU370 breaker at 120/240V AC?

The breaker carries a maximum AIR rating of 10kA at 120/240V AC, meaning it can safely interrupt fault currents up to that level.

How much heat does the 70A three-pole breaker dissipate during continuous all-day operation?

As a standard thermal-magnetic breaker, it dissipates heat proportional to the 70A load on each pole; the 4.1-inch frame is designed to handle this within its 100A frame rating without forced cooling.

Which load-center series must I already have to install this QOU370 breaker?

It is compatible only with Square D QO series panelboards or load centers, so one of those must already be in place.

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