Square D BJA36125 Molded Case Circuit Breaker

Yes. The PowerPacT B-frame is Schneider Electric's designated replacement for legacy F-frame breakers. The BJA36125 is a direct retrofit for obsolete FA36125 and FH36125 I-Line circuit breakers, maintaining the identical physical footprint in existing panelboards.

This circuit breaker is engineered exclusively for Square D I-Line panelboards and switchboards. It features a plug-on line side connection with shrouded jaws that clamp directly onto the energized I-Line bus structure.

No. Because it is specifically manufactured with an I-Line plug-on bracket and line side jaws, it cannot be used in unit mount, DIN rail, or standard surface mount enclosures.

Yes. Like standard PowerPacT B-frame circuit breakers, this unit carries a HACR rating, certifying it for use with heating, air conditioning, and refrigeration equipment in compliance with modern electrical codes.

While primarily used for alternating current, the BJA36125 is also rated for direct current applications up to 250VDC, where it provides a maximum 50kA short circuit interrupting capacity.

The LI designation indicates thermal magnetic protection with Long-Time (L) and Instantaneous (I) trip functions. The fixed thermal element provides continuous overload protection, while the fixed magnetic element protects the circuit against severe short circuits.

No. Although the internal thermal magnetic trip unit is bi-directional, this specific model is built with an I-Line bus connection on the line side. Because it must plug directly into the panelboard bus, physical reverse feeding is impossible.

The load side is equipped with standard mechanical lugs designed to secure one 14 AWG to 2/0 AWG copper or aluminum conductor per phase. The line side requires no wiring, as it plugs securely onto the I-Line bus.

Yes. The front cover features a built-in push-to-trip button. This enables electricians to mechanically trip the breaker for maintenance testing and safely verify that the operating mechanism moves freely.

Yes. The operating toggle is compatible with standard Square D padlock attachments. This allows the breaker to be secured in the OFF position to comply with standard OSHA Lockout/Tagout safety procedures.