Square D QOB3501021 Circuit Breaker 50A 240V 3 Pole

Product Description

The SQUARE D QOB3501021 is a 3-pole, bolt-on miniature circuit breaker rated for 50 amps at 240 VAC. It provides overcurrent and short-circuit protection in panel applications requiring a bolt-on mount style. Box lug terminals accept wire from 8 to 2 AWG, making it suitable for branch circuit and feeder applications. The breaker is compatible with shunt trip configurations operating at 120, 208, or 240 VAC. Licensed electricians install this breaker during new construction, panel upgrades, or equipment replacement. It carries UL Listed and CSA certifications and meets RoHS compliance standards.

This circuit breaker is used in commercial and residential electrical distribution panels where a 3-pole bolt-on breaker is required. Its 50-amp rating suits HVAC equipment, large appliances, and other 240-volt three-phase or multi-wire branch circuits. The box lug terminal design provides a secure, vibration-resistant connection. For use with shunt trip accessories rated at 120, 208, or 240 VAC where remote trip capability is needed.

Key Features

• 50-amp overcurrent protection at 240 VAC
• 3-pole configuration for three-phase or multi-wire branch circuits
• Bolt-on mount for secure panel installation
• Box lug terminals accept 8 to 2 AWG wire
• Compatible with shunt trip accessories at 120, 208, or 240 VAC
• UL Listed, CSA certified, and RoHS compliant

Compatibility

Designed for use with shunt trip accessories rated at 120/208/240 VAC. Intended as a bolt-on miniature circuit breaker replacement in compatible Square D QOB-series panelboards.

Installation Notes

Installation must be performed by a licensed electrician in accordance with the National Electrical Code (NEC). De-energize the panel and verify the absence of voltage before handling any breaker or bus connections. Confirm wire gauge is within the 8 to 2 AWG range before terminating at the box lugs. If a shunt trip accessory is being used, verify the control voltage matches the accessory rating before energizing.