Square D Q120 Circuit Breaker 20 Amp Single Pole

Product Description

The SQUARE D Q120 is a single-pole, plug-in circuit breaker rated at 20 amps and 120 volts AC. It provides overcurrent and short-circuit protection for branch circuits in residential and light commercial load centers. With a 10 kiloamp interrupting rating, the Q120 is built to safely interrupt fault currents typical of standard service panels. Licensed electricians and qualified service personnel install this breaker as part of new panel builds, circuit additions, or direct replacement of failed overcurrent protection devices. It carries UL 489 approval, confirming it meets recognized standards for molded-case circuit breakers.

The Q120 is designed for use in load centers that accept plug-in style breakers. It is well-suited for protecting 20-amp branch circuits serving outlets, appliances, and dedicated equipment circuits in residential construction and light commercial applications. The plug-in mounting style allows for straightforward installation into compatible panelboards without additional hardware. Where a failed or tripped breaker on a 20-amp, single-pole circuit needs replacement, the Q120 is a direct-fit solution for compatible load centers.

Key Features

• 20-amp continuous current rating for standard branch circuit protection
• 120-volt AC voltage rating suitable for single-pole residential and light commercial circuits
• 10 kiloamp interrupting rating for safe fault current interruption
• Plug-in mounting for tool-free installation into compatible load centers
• UL 489 listed, meeting established standards for molded-case circuit breakers
• Single-pole configuration for 120-volt branch circuit applications

Compatibility

Designed for use in load centers that accept plug-in style single-pole breakers. Refer to the panel manufacturer's compatibility documentation to confirm fit before installation.

Installation Notes

Installation must be performed by a licensed electrician in accordance with NFPA 70 (National Electrical Code) and applicable local codes. Always de-energize the main service disconnect and verify the panel is de-energized with a calibrated voltage tester before handling any breaker or wiring. Seat the breaker firmly into the bus bar clip until it is fully engaged before securing any load wiring. Do not install this breaker in panels where the bus bar configuration is incompatible with the plug-in mounting style.

Technical Specifications

• Current Rating: 20 amps
• Voltage Rating: 120 volts AC
• Interrupting Rating: 10 kiloamps
• Number of Poles: 1
• Mounting Type: Plug-In
• Used On: Load Center
• Width: 3.6 inches
• Depth: 12.8 inches
• Height: 3.5 inches
• Approval: UL 489

Standard Information

• Brand: SQUARE D
• Manufacturer Part Number: Q120