Square D QOU3405283 Miniature Circuit Breaker 40A 3P

Product Description

The SQUARE D QOU3405283 is a 3-pole miniature circuit breaker rated for 40 amps at 240 volts AC, designed for panel mount installation in load centers and distribution panels. It provides overcurrent and short-circuit protection for three-phase or multi-wire branch circuits in residential and light commercial applications. The ring tongue terminal connection type ensures a secure, low-resistance conductor termination. Licensed electricians install this breaker as part of panel work or system upgrades where a compact, panel-ready breaker is required to meet branch circuit protection requirements.

This breaker is suited for panel mount configurations in load centers where a 3-pole, 40-amp breaker is called for. Typical applications include HVAC equipment circuits, multi-wire branch circuits, and sub-panel feeder positions in residential and light commercial electrical systems. Its compact footprint makes it appropriate for installations where panel space is limited. The ring tongue terminal design accommodates standard conductor termination methods used in panel assembly work.

Key Features

• 40-amp continuous current rating for branch circuit overcurrent protection
• 240 VAC rated for standard North American panel voltages
• 3-pole configuration for three-phase or multi-wire circuit applications
• Panel mount design for direct installation in compatible load centers
• Ring tongue terminal connection for secure, code-compliant conductor termination
• Compact miniature circuit breaker form factor conserves panel space

Compatibility

Designed as an OEM-style replacement miniature circuit breaker for panel mount load centers and distribution panels requiring a 3-pole, 40-amp, 240 VAC device with ring tongue terminal connections.

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 absence of voltage with a meter before handling any breaker or conductor. Follow the panel manufacturer's instructions for breaker seating and conductor torque specifications as listed on the equipment nameplate. Do not install in panels that are not rated for this breaker type.