Square D LH36125 Molded Case Circuit Breaker

This breaker is designed exclusively for Square D I-Line panelboards and switchboards. It utilizes a plug-on I-Line connection that engages directly with the panel busbars.

No, this breaker features an I-Line plug-in connection. It is exclusively designed for commercial and industrial I-Line panelboards, and will not fit in standard QO or Homeline residential load centers.

The factory-installed lugs accept either one 1 AWG to 600 kcmil conductor or two 1 AWG to 250 kcmil conductors per phase. Both aluminum and copper wires are permitted.

No, this breaker features an I-Line style plug-in connection. The breaker jaws plug directly into the busbars of a compatible Square D I-Line panelboard or switchboard, eliminating the need for separate mounting brackets or strap kits.

While the thermal element for overload protection is fixed at 125A, the magnetic instantaneous trip (I) can be adjusted by the user to coordinate with downstream devices and handle specific inrush currents.

The "LI" designation indicates that the breaker provides Long-Time (L) and Instantaneous (I) trip functions. The long-time function protects against sustained overloads, while the instantaneous function protects against sudden short circuits.

Yes, this breaker is rated for DC systems, providing up to 50kA interrupting capacity at 250VDC and 20kA at 500VDC.

Yes, the LH36125 shares the same physical L-frame footprint and I-Line mounting as the LA36125. It can serve as a direct replacement while offering a higher interrupting rating of up to 65kA at 240VAC.

It is a Square D L-frame molded case circuit breaker. It fits into the same panel space as other legacy L-frame breakers, such as the LA and Q4 series.

No, this breaker is equipped with a standard thermal-magnetic trip unit that provides long-time overload and instantaneous short-circuit protection. It does not include built-in ground fault or equipment protection functions.