Schneider Electric QOB320 Bolt-On Circuit Breaker

Schneider Electric's QOB320 Bolt-On Circuit Breaker is a 3-pole, 20-amp miniature breaker designed for bolt-on mounting in QOB-type panelboards, providing precise overcurrent protection for three‑phase circuits. It is rated for 120/240 VAC operation with a 10 kA interrupt rating at 240 VAC, offering reliable fault clearing for typical commercial installations. The device employs a thermal-magnetic trip mechanism and accepts 14 to 8 AWG conductors at its lugs, enabling straightforward wiring in compatible enclosures. As part of the Square D QO/QOB family, the QOB320 is intended for bolt-on installations in panelboards such as NQO and NQOD configurations where three-phase protection up to 20 A is required.