Siemens ED43B100L Molded Case Circuit Breaker

No. The ED43B100L is an ED frame molded case circuit breaker designed for unit mounting in industrial enclosures, switchboards, and motor control centers. It will not fit in standard residential plug-on or bolt-on load centers that require QP, QT, or similar branch breakers.

The "L" suffix indicates that the circuit breaker is supplied with factory-installed lugs on both the line and load sides. The standard ED43B100 without the suffix typically ships with load lugs only.

Yes. Like most Siemens thermal-magnetic ED frame breakers, the ED43B100L does not have restricted "Line" and "Load" markings, making it suitable for reverse feed or back-fed applications. Always confirm compliance with local electrical codes and use a hold-down kit if required by the application.

This is a unit-mount circuit breaker. It bolts directly to the backpan or mounting surface of a switchboard or control panel, rather than plugging into a busbar or snapping onto a DIN rail.

Yes. Because the ED43B100L utilizes thermal-magnetic trip technology, it is suitable for direct current applications. It carries a DC voltage rating of up to 250V DC with an interrupting capacity of 30kA.

Siemens has largely superseded the legacy ED frame series with the newer 3VA molded case circuit breaker family. The modern equivalent is typically found in the 3VA51 series, specifically catalog number 3VA5110-4EC31-0AA0. However, the ED43B100L remains readily available for maintaining existing infrastructure.

No. This breaker features fixed thermal and fixed magnetic (LI) trip functions. The overload and short-circuit protection limits are set at the factory and cannot be field-adjusted by the installer.

Yes. The factory-installed lugs on this breaker are dual-rated for both copper (Cu) and aluminum (Al) conductors, accepting wire gauges from 10 AWG up to 1/0 AWG. Ensure an appropriate oxide-inhibitor joint compound is used when terminating aluminum wire.