Square D LCL36400 Molded Case Circuit Breaker

All three are 400A, 3-pole, legacy L-frame molded case circuit breakers with identical physical dimensions and mounting. The difference is their interrupting capacity at 480V. The LAL36400 is standard-rated at 30kAIC, the LHL36400 is high-rated at 35kAIC, and the LCL36400 is extra-high-rated at 65kAIC.

No. The LCL36400 is a unit-mount (bolt-on) circuit breaker designed for base mounting in enclosures, switchboards, or motor control centers. If you need a plug-on breaker for a Square D I-Line panelboard, you must use the I-Line equivalent, which is the LCP36400.

The LCL36400 features an adjustable magnetic trip dial with a Low setting of 2000A and a High setting of 4000A. This allows electricians to coordinate the instantaneous trip point with downstream devices and accommodate temporary motor inrush currents without nuisance tripping.

The standard AL400LA lugs on the LCL36400 accept either one 1 AWG to 600 kcmil aluminum or copper wire, or two 1 AWG to 250 kcmil aluminum or copper wires per phase.

LI stands for Long-Time and Instantaneous trip functions. The Long-Time function provides fixed thermal overload protection based on the 400A rating. The Instantaneous function provides magnetic short-circuit protection, which can be adjusted via a dial on the face of the breaker.

Yes. Like most Square D legacy molded case circuit breakers, the LCL36400 includes a push-to-trip button on the faceplate. This allows you to manually trip the breaker to verify the mechanical operation of the trip mechanism during routine maintenance.

Yes. Although the LCL36400 has a maximum voltage rating of 600VAC, it is fully compatible with 480V and 240V systems. Its interrupting capacity increases at lower voltages, providing 65kAIC at 480V and 100kAIC at 240V.

The LCL36400 is part of Square D's legacy L-Frame series of molded case circuit breakers. While it is an older design, it remains widely used in existing Square D switchboards, motor control centers, and enclosures. For new installations, Square D typically recommends the newer PowerPact L-Frame series, such as the LGL36400.