Square D QOB31001021 Bolt-on Circuit Breaker 100A 3P

Product Description

The SQUARE D QOB31001021 is a bolt-on miniature circuit breaker rated for 100 amps at 240 VAC across 3 poles. It provides overcurrent and short-circuit protection in panelboards and load centers that accept bolt-on style breakers. The QOB31001021 accepts wire sizes from 4 AWG through 2/0 AWG via box lug terminals, making it well-suited for feeder and branch circuit applications that require a higher-ampacity 3-pole device. Licensed electricians install this breaker as part of new construction wiring, panel upgrades, or direct replacement of failed breakers in compatible bolt-on enclosures. It carries UL Listed, CSA, and RoHS compliance certifications.

This circuit breaker is intended for use in bolt-on style panelboards and load centers. The shunt trip accessory compatibility supports remote trip applications requiring 120, 208, or 240 VAC shunt trip coils. At 100 amps and 3 poles, it is commonly used to protect three-phase or multi-wire branch circuits in commercial and light-industrial settings, as well as large residential feeder applications. The box lug terminal design accommodates aluminum or copper conductors in the 4 AWG to 2/0 AWG range.

Key Features

• 100-amp continuous current rating at 240 VAC
• 3-pole configuration for three-phase or multi-wire circuit protection
• Bolt-on mount type for secure, vibration-resistant installation in compatible panelboards
• Box lug terminals accept 4 AWG through 2/0 AWG conductors
• Compatible with shunt trip accessories rated 120, 208, or 240 VAC for remote trip functionality
• UL Listed, CSA certified, and RoHS compliant

Compatibility

Designed for use with bolt-on style panelboards and load centers that accept QOB-series miniature circuit breakers. Compatible with shunt trip accessories rated at 120, 208, or 240 VAC.

Installation Notes

Installation must be performed by a licensed electrician in accordance with the NEC and all applicable local codes. De-energize and lock out the panelboard before removing or installing any circuit breaker. Verify that conductor size falls within the 4 AWG to 2/0 AWG rating of the box lug terminals before terminating. Do not exceed the breaker's rated ampacity or install in a non-bolt-on enclosure.