Square D THQL2145 45A 2-pole Circuit Breaker 120/240V

Product Description

The SQUARE D THQL2145 is a 2-pole, plug-in circuit breaker rated at 45 amps and 120/240 volts AC, designed for use in residential and light commercial load centers. With a 10 kiloamp interrupting rating, it provides reliable overcurrent protection for branch circuits. The quick-make/quick-break mechanism ensures fast, positive switching action, while the common trip bar guarantees simultaneous disconnection of both poles on an overcurrent or fault event. A visible trip indication makes it easy to identify tripped breakers at a glance, supporting faster service calls and safer panel work. Licensed electricians install this breaker as a direct plug-in unit requiring no tools beyond standard panel work.

The THQL2145 is suited for residential and light commercial load center applications where a 45-amp, 2-pole branch circuit breaker is required. It accepts wire sizes from 8 to 3 AWG, covering common branch circuit conductors used in 240-volt appliance circuits, HVAC equipment feeds, and sub-panel ties. Its non-interchangeable, plug-in design ensures it seats correctly in compatible load centers and cannot be substituted with incompatible breaker types. The unit is also rated suitable for reverse feed applications, offering added flexibility during panel configuration.

Key Features

• Quick-make/quick-break mechanism for positive, reliable switching action
• Common trip bar ensures simultaneous 2-pole disconnection on fault events
• Visible trip indication for fast identification during service
• Rated suitable for reverse feed applications
• Accepts 8 to 3 AWG wire for standard branch circuit wiring
• UL Listed under file E11592

Compatibility

Non-interchangeable plug-in type designed for use in compatible load centers accepting THQL-series breakers. Consult the load center manufacturer documentation to confirm breaker compatibility before installation.

Installation Notes

Installation must be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and applicable local codes. De-energize and lock out the panel at the utility disconnect or main breaker before beginning any work inside the load center. Confirm wire size falls within the 8 to 3 AWG range and that terminal connections are torqued per the load center manufacturer specifications. Do not force the breaker into positions or panel types for which it is not rated.

Technical Specifications

• Current Rating: 45 amps
• Voltage Rating: 120/240 volts AC
• Number of Poles: 2
• Interrupting Rating: 10 kiloamps
• Mounting Type: Plug-In
• Breaker Type: Non-Interchangeable
• Wire Size Range: 8 to 3 AWG
• Used On: Load Center
• Approval: UL E11592

Standard Information

• Brand: SQUARE D
• Manufacturer Part Number: THQL2145