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SQUARE D QOB345 three-pole bolt-on breaker grey plastic body 3.12 by 2.25 inches

SQUARE D

SQUARE D QOB345 45A 3 Pole 120/240V AC Circuit Breaker

SKU CH-Z4CM-E7BNY

A 45 A, three-pole miniature circuit breaker rated 120/240 V AC and 48 V DC with a 10 kA interrupting rating for QO-series panelboards

  • Three-pole protection for balanced 120/240 V AC loads
  • 45 A rating matches standard branch-circuit requirements
  • 10 kA interrupting capacity clears faults safely
  • Bolt-on mounting fits Square D QO panelboards directly
  • Compact 3.12 in length saves panel space

SQUARE D QOB345 45A Three-Pole Breaker

This SQUARE D QOB345 is a 45A three-pole miniature circuit breaker rated for 120/240V AC and 48V DC. It belongs to the QO series and uses a bolt-on mounting style with a paddle actuator. The unit fits a 100A frame size and carries a 10kA interrupting rating at 120/240V AC.

Check Panel Compatibility and Space

Verify that your panelboard is a Square D NQOD series unit compatible with QO breakers before ordering. Confirm the three-pole slot width matches the 2.25 in width and that the 3.12 in length and 2.91 in depth fit within the enclosure. Ensure the system operates within the 77 Degrees F minimum operating temperature.

Suits Standard Three-Phase Branch Circuits

This breaker suits electricians wiring standard three-phase branch circuits in compatible Square D load centres. It is not for installations requiring a higher interrupting rating than 10kA, DC voltages above 48V, or panels that accept only plug-on breakers. Buyers needing single-pole or two-pole protection should select a different model.

How it compares

Measured against everything we stock in Breakers & Circuit Protection, at today’s prices. Recalculated every night.

Price $192.99
Pricier than about 81% of the 1,135 comparable items (median $54.99).

Specifications

Product
Brand nameSQUARE D

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