Siemens ED43B040 Molded Case Circuit Breaker

As a standard offering, the Siemens ED43B040 is supplied with load side lugs only (catalog number LN1E100). The line side is designed to bolt directly to the bus in panelboards or switchboards. If you need line side lugs for an individual enclosure application, they must be ordered separately or you must specify a factory-modified breaker with an L suffix.

Yes. All ED frame breakers feature a non-interchangeable trip unit and are UL listed to be reverse fed. This makes the ED43B040 suitable for use as a back-fed main breaker without violating UL 489 standards.

The ED43B040 is a bolt-on molded case circuit breaker designed to install directly into Siemens Sentron P1, P2, and P3 panelboards, as well as Siemens SB series switchboards. It is also backward compatible with many legacy ITE F-Series enclosures.

While it carries a rating for up to 250VDC, standard Siemens application guidelines for direct current systems require using two poles of this three-pole breaker. You must wire one pole on each leg of the DC supply circuit to achieve the full 250VDC rating.

No. It is equipped with a fixed thermal and fixed magnetic trip unit, denoted by the LI trip function code. Both the long-time overload protection and instantaneous short-circuit protection thresholds are set at the factory and cannot be altered in the field.

Siemens is transitioning the ED frame to the newer 3VA series. The direct functional replacement is the 3VA5140-4EC31-0AA0. Keep in mind that installing the 3VA equivalent into an older Sentron panelboard requires a specific mounting strap adapter kit.

Yes. This breaker is Heating, Air Conditioning, and Refrigeration (HACR) rated, which means it is UL approved for protecting the group motor loads commonly found in commercial HVAC equipment.