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Square D QOU170 miniature circuit breaker, single-pole toggle, grey plastic body, DIN-rail mount

SQUARE D

SQUARE D QOU170 Miniature Circuit Breaker 70A 1 Pole 120/240V AC

SKU CH-6EPK-TZFMN

Protects single-phase 120/240 V AC circuits at 70 A with a 10 kA interrupting rating and reversible box-lug terminals

  • 70 A rating protects heavy single-phase circuits
  • 10 kA interrupting capacity clears high fault currents
  • 120/240 V AC rating fits standard residential panels
  • 48 V DC rating allows limited low-voltage use
  • QO-series compatibility ensures direct fit in QO load centres

SQUARE D QOU170 70A Circuit Breaker

This SQUARE D QOU170 is a miniature circuit breaker rated at 70 amps for single-phase 120/240V AC systems. It uses a toggle actuator and mounts on surface or DIN rail within compatible QO series panelboards. The unit suits air conditioning, refrigeration and heating equipment.

QO Series Compatibility and 10kA Interrupting Limit

The breaker fits only QO series load centres and carries a maximum AIR rating of 10kA at 120/240V AC. It also supports 48V DC circuits. The slotted box lug accepts reversible line and load connections within the 100A frame size.

Buyers Needing Multi-Pole

This single-pole device cannot protect multi-phase loads or circuits demanding an interrupting rating above 10kA. Installers requiring two-pole or three-pole configurations must select a different model.

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Price $54.99
Typical for this category: the median of 1,135 items is $54.99.

Specifications

Product
Brand nameSQUARE D

Questions about this item

How do I choose the right amperage for my panel?

Select the 70 A rating when the branch circuit is protected at 70 A and the panel is a QO series load centre; the breaker fits a 100 A frame and mounts on DIN rail or surface.

What does the 10 kA AIR rating mean once installed?

It means the breaker can safely interrupt up to 10 kA of fault current at 120/240 V AC without damage, meeting typical residential and light commercial requirements.

Can this single-pole breaker be used on a 240 V circuit?

Yes — it is rated 120/240 V AC single phase, so it protects one hot leg of a 240 V load while the other leg uses a separate breaker.

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