SQUARE D QOB120HID Miniature Circuit Breaker 20A 1 Pole 120/240V

QOB Series 20 A Breaker

The Square D QOB120HID is a single-pole miniature circuit breaker rated at 20 amps for 120/240 V AC and 48 V DC systems. It mounts by bolting onto compatible QO-series panelboards and load centres. The paddle actuator provides clear on/off indication. This breaker suits residential and light-commercial panels that require a bolt-on format.

High-Intensity Discharge Rating

The HID designation means the breaker is tested for the high inrush currents of HID lighting circuits without nuisance tripping. It carries a 10 kA interrupting rating at 120/240 V AC, providing adequate short-circuit protection for typical branch circuits. The 100 A frame size sets the physical envelope, but the 20 A trip unit limits continuous load to that value. Circuits with sustained loads above 20 A or fault currents exceeding 10 kA need a different device.

Bolt-On QO Compatibility

The breaker installs only in Square D NQOD panelboards and QO-series load centres that accept bolt-on QOB frames. The pressure-plate terminals accept standard copper conductors. Builders using plug-on QO panels or other manufacturers' enclosures cannot use this unit. Verify the panelboard series before purchase.