Square D QOU345 45A 240V 3-pole Miniature Circuit Breaker

Product Description

The SQUARE D QOU345 is a 3-pole miniature circuit breaker rated at 45 amps and 240 volts AC, designed for panel mount installation in commercial and residential electrical distribution equipment. It provides overcurrent and short-circuit protection for three-phase or multi-wire branch circuits. Box lug terminal connections accept 14 to 2 AWG wire. The QOU345 meets CSA, IEC, UL, and RoHS requirements, making it suitable for a wide range of protected branch circuit applications handled by licensed electricians.

The QOU345 is rated for use with air conditioning and refrigeration equipment as well as heating systems, making it a common choice for HVAC branch circuit protection. It is appropriate for both light commercial and residential panel installations where a compact, multi-pole breaker is required. The panel mount design integrates directly into compatible load centers and distribution panels.

Key Features

• 45-amp trip rating with 240 VAC operating voltage
• 3-pole configuration for multi-wire branch circuit protection
• Box lug terminals accept 14 to 2 AWG conductors
• Panel mount design for direct load center installation
• Rated for air conditioning, refrigeration, and heating equipment circuits
• Certified to CSA, IEC, UL, and RoHS standards

Compatibility

Rated for use with air conditioning and refrigeration equipment and heating systems. Designed as a panel mount miniature circuit breaker for compatible Square D load centers and distribution panels that accept QOU-series breakers.

Installation Notes

Installation must be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and all applicable local codes. De-energize the panel and verify zero voltage with a meter before handling or installing the breaker. Confirm that conductor sizing matches the 14 to 2 AWG terminal range and that the load center is rated to accept QOU-series breakers before installation.