Abb THHQB1120 Bolt-on Circuit Breaker 20A 1 Pole

Product Description

The ABB THHQB1120 is a single-pole, bolt-on thermal-magnetic circuit breaker in ABB's Q Line series, rated at 20 amps and 22kA interrupting capacity. It is designed for use in load centers and lighting panels where bolt-on bus connections are required. The thermal-magnetic trip mechanism provides overcurrent and short-circuit protection in both residential and commercial electrical distribution systems. Licensed electricians install this breaker as part of branch-circuit protection schemes governed by the National Electrical Code. Its compact one-inch-per-pole footprint makes it well suited for high-density panelboard layouts.

The THHQB1120 is intended for residential and commercial load centers and lighting panels that accept bolt-on style breakers. It is part of the broader Q Line breaker family, which is available in one-, two-, and three-pole configurations. This breaker can also be ordered with auxiliary contact or shunt trip accessories, and it is available in configurations rated for HID lighting applications, giving installers flexibility across a range of branch-circuit protection needs.

Key Features

• 20-amp rating with 22kA interrupting capacity for reliable short-circuit protection
• Bolt-on design for secure bus connection in load centers and lighting panels
• One-inch-per-pole compact footprint supports high-density panel installations
• Quick-make and Quick-break mechanism for fast, consistent trip response
• Common trip bar design ensures coordinated multi-pole operation across the Q Line family
• Easy-to-spot trip indication simplifies fault identification during service calls

Compatibility

Designed as a bolt-on replacement or new-installation breaker for load centers and lighting panels that accept Q Line bolt-on circuit breakers.

Installation Notes

Installation must be performed by a licensed electrician in accordance with the National Electrical Code and all applicable local codes. De-energize the panel and verify the absence of voltage before removing or installing any circuit breaker. Confirm that the panel accepts bolt-on style breakers before installation, as bolt-on and plug-in breakers are not interchangeable. Torque all wire terminations to the value specified on the panel nameplate or breaker label.