Square D THQL2120 20A 2-pole Circuit Breaker 120/240V

Product Description

The SQUARE D THQL2120 is a 2-pole, plug-in circuit breaker rated at 20 amps and 120/240 volts AC, designed for use in residential and light commercial load centers. With a 10 kiloamp interrupting rating, this non-interchangeable breaker provides reliable branch circuit protection against overloads and short circuits. Quick-make/quick-break mechanisms ensure consistent switching performance, while a common trip bar guarantees simultaneous pole interruption on a fault. A high-visibility trip indication flag allows technicians to identify a tripped breaker at a glance without removing the panel cover. Licensed electricians install this breaker as a standard branch circuit device in load centers where double-pole, 20-amp protection is required.

This breaker is suited for residential and light commercial applications requiring a 2-pole, 20-amp branch circuit — typical uses include 240-volt appliance circuits, HVAC disconnect feeds, water heater branch circuits, and similar dual-voltage loads. The 1-inch plug-in mounting format fits standard load center bus bar configurations. Accepted wire sizes range from 14 to 8 AWG, covering most standard branch circuit conductor gauges encountered in residential panel work. The UL listing covers both US and Canadian installations, making it appropriate for projects governed by either the NEC or Canadian Electrical Code.

Key Features

• 20-amp, 2-pole configuration delivers 120/240 VAC branch circuit protection in a single 1-inch slot
• 10 kA interrupting rating handles fault currents typical of residential and light commercial services
• Quick-make/quick-break mechanism ensures reliable, consistent contact operation
• Common trip bar guarantees both poles open simultaneously under fault conditions
• High-visibility trip indication flag speeds troubleshooting and panel inspection
• UL listed for both US and Canadian installations

Compatibility

Non-interchangeable plug-in design intended for use in compatible load centers accepting the THQL breaker series. Consult the load center manufacturer documentation to confirm breaker acceptance before installation.

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 load center at the service disconnect and verify absence of voltage with a meter before handling any panel components. The plug-in design snaps onto the bus bar without additional hardware; confirm the breaker is fully seated before restoring power. Never exceed the wire size range of 14 to 8 AWG for conductors terminated on this device.

Technical Specifications

• Current Rating: 20 amps
• Voltage Rating: 120/240 volts AC
• Number of Poles: 2
• Interrupting Rating: 10 kiloamps
• Mounting Type: 1 inch plug-in
• Wire Size: 14 to 8 AWG
• Breaker Type: Non-interchangeable
• Used On: Load center
• Certifications: UL listed (US and Canada)

Standard Information

• Brand: SQUARE D
• Manufacturer Part Number: THQL2120