Square D QOU370 70A 240V 3-pole Miniature Circuit Breaker

Product Description

The SQUARE D QOU370 is a 3-pole, panel-mount miniature circuit breaker rated at 70 amps and 240 volts AC. It provides overcurrent and short-circuit protection in electrical distribution panels serving HVAC, refrigeration, and heating equipment. The QOU370 accepts wire sizes from 12 to 2/0 AWG via box lug terminals, giving installers flexibility across a range of conductor sizes. At 1.45 pounds, it is a compact, load-center-style breaker built to meet CSA, IEC, and UL standards. Licensed electricians install this breaker as part of panel service work on commercial and residential HVAC systems and other high-draw equipment loads.

The QOU370 is designed for panel-mount installation in load centers supporting air conditioning, refrigeration, and heating equipment. Its 3-pole configuration delivers 240-volt protection across all three conductors simultaneously, which is standard practice for three-phase and split-phase HVAC equipment circuits. The box lug terminal design accommodates a wide AWG range, reducing the need for additional ferrules or adapters during installation. This breaker is suited for both new installation and replacement service in commercial and residential electrical panels.

Key Features

• 70-amp continuous current rating for high-draw HVAC and refrigeration circuits
• 240-volt AC rating across 3 poles for split-phase and three-phase applications
• Box lug terminals accept 12 to 2/0 AWG conductors
• Panel-mount design for standard load center installation
• UL Listed, CSA certified, IEC compliant, and RoHS compliant

Compatibility

Listed for use with air conditioning and refrigeration equipment and heating systems. Consult the panel manufacturer specifications to confirm load center compatibility before installation.

Installation Notes

Installation must be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and applicable local codes. De-energize the panel and verify zero voltage with a calibrated meter before handling any bus connections or existing wiring. Torque all terminal lugs to the values specified on the breaker label or in the manufacturer documentation. Confirm conductor insulation rating and ampacity are appropriate for the circuit before securing the panel cover.