Federal Pacific HM632125 Molded Case Circuit Breaker

This breaker is designed specifically for legacy Federal Pacific Electric (FPE) industrial switchgear, load centers, and distribution panelboards that are configured to accept HM frame molded case circuit breakers.

Yes, Federal Pacific HM frame breakers are commonly used as direct drop-in replacements for discontinued NM frame breakers of the same amperage and pole configuration. They fit into the same panelboard space without requiring retrofit adapters.

The LI designation indicates that the thermal-magnetic trip unit provides Long-Time (L) protection against sustained overcurrents and Instantaneous (I) protection against short circuits. On this specific model, the instantaneous magnetic threshold is adjustable.

The breaker itself features a bolt-on connection design, but the specific bolts and connecting hardware required to attach the line side to the busbars are typically part of the panelboard chassis or must be reused from the outgoing breaker.

Before bolting the breaker into legacy Federal Pacific switchgear, inspect the panel busbars for signs of pitting, corrosion, or thermal damage. The contact surfaces must be clean and smooth to ensure a safe, low-resistance electrical connection.

No, they are the exact same physical breaker. The HM632125-R is simply an alternate catalog number used for inventory sourcing, but it shares the identical HM frame dimensions, trip functions, and electrical ratings.

The breaker is equipped with mechanical lugs on the load side. Conductors must be inserted into the lugs and tightened to the specific torque value printed on the breaker label to ensure a secure and code-compliant connection.

Yes, a three-pole molded case circuit breaker can be applied in a single-phase system by utilizing only two of the three poles, provided the system voltage does not exceed the maximum 600V rating of the breaker.