Schneider Electric QOB320 Bolt-On Circuit Breaker

Schneider Electric's Square D QOB320 Bolt-On Circuit Breaker is a three-pole, 20-ampere protective device designed for bolt-on installation in QOB-series panels and compatible load centers. Rated for 240 V AC, it delivers thermal-magnetic overcurrent protection with a 10 kA (10,000 A) interrupting capacity at 240 V, making it suitable for three-phase distribution circuits in light industrial and commercial settings. The QOB320 belongs to the QOB family, providing bolt-on mounting rather than plug-on, and supports conductor terminations in common ranges such as 14 AWG through 8 AWG with a pressure-plate connection for secure, consistent wiring. As a 3P, 20A unit, it protects three-phase loads and can be reset manually with the handle indicating the circuit status. The bolt-on format is intended for installations that require a fixed-mount protective device in QOB-compatible panels, including protection of 3‑phase motors and other equipment fed from 240 V services. In practical terms, choose the QOB320 when your panel specifies a bolt-on 3P, 20A breaker in a 240 V system and you need a reliable, thermally-magnetic protection device that fits Square D’s QOB lineup.