Square D LH36150 Molded Case Circuit Breaker

This breaker is designed exclusively for Square D I-Line panelboards and switchboards. It utilizes the I-Line plug-in mounting system, which allows for modular installation alongside other I-Line breakers.

No, this breaker features an I-Line plug-in connection and is exclusively compatible with Square D I-Line panelboards and switchboards. It will not fit in standard residential QO or Homeline load centers.

The standard lugs accept either a single conductor ranging from 1 AWG to 600 kcmil or two conductors ranging from 1 AWG to 250 kcmil. Both aluminum and copper wires are supported.

Yes, the standard lugs on this breaker are dual-rated for both aluminum (Al) and copper (Cu) conductors. Ensure you use an approved oxide-inhibiting compound when terminating aluminum wire.

The "LI" designation means the breaker provides Long-Time (L) and Instantaneous (I) overcurrent protection. The long-time function protects against sustained overloads, while the instantaneous function provides immediate tripping during severe short circuits.

While the thermal protection (long-time) is fixed at 150 amps, the magnetic (instantaneous) trip setting can be adjusted by the user. This allows electricians to fine-tune the short-circuit response based on the specific load characteristics and coordination requirements of the electrical system.

Both are 150-amp, 3-pole L-frame breakers designed for I-Line panelboards. The primary difference is the interrupting capacity. The LH36150 is a high-interrupting breaker rated at 65kA at 240VAC, whereas the standard LA36150 is rated at 42kA at 240VAC.

Always de-energize the panelboard or switchboard before installing or removing any I-Line breaker. Verify that the power is off using a properly rated voltage sensing device, and follow all OSHA lockout/tagout (LOTO) procedures and NFPA 70E guidelines for personal protective equipment (PPE).