Square D QOB120HM 1 Pole Bolt-on Circuit Breaker 20A

Product Description

The SQUARE D QOB120HM is a 1-pole, bolt-on miniature circuit breaker rated at 20 amps and 120 volts AC. It provides overcurrent and short-circuit protection for branch circuits in commercial and residential electrical distribution panels. The bolt-on mount design secures the breaker directly to the bus bar, reducing the risk of vibration-related loosening common with plug-in styles. A pressure plate terminal connection accommodates 14 to 8 AWG copper conductors. Licensed electricians install this breaker as part of a panelboard replacement, circuit addition, or service upgrade. It carries UL listing and CSA certification and meets RoHS compliance requirements.

The QOB120HM is designed specifically for use with Square D NQOD panelboards, making it a direct-fit replacement in commercial light-duty distribution applications. Typical install scenarios include branch circuit protection for lighting, HVAC controls, and general-purpose receptacle circuits. The single-pole configuration handles 120-volt branch loads. Its compact form factor fits standard NQOD panel spaces without modification.

Key Features

• 20-amp overcurrent rating with 120-volt AC operating voltage
• Bolt-on mount type for secure, vibration-resistant installation on the bus bar
• Pressure plate terminal accepts 14 to 8 AWG conductors
• Single-pole design for 120-volt branch circuit protection
• UL Listed, CSA certified, and RoHS compliant
• Direct replacement fit for Square D NQOD panelboards

Compatibility

Designed for use with Square D NQOD panelboards as stated by the manufacturer.

Installation Notes

Installation must be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and all applicable local codes. De-energize the panel and verify absence of voltage with a meter before handling any breaker or bus bar connections. Confirm conductor wire gauge falls within the 14 to 8 AWG range before terminating at the pressure plate. Do not exceed the breaker's rated amperage when sizing the protected circuit.