A drop-in replacement for older commercial systems, the Siemens E43B080 restores reliable power distribution without panel upgrades. This 80A, three-pole molded case circuit breaker features a proven thermal-magnetic trip mechanism for long-time and instantaneous protection. Designed as a unit mount MCCB, it installs seamlessly into legacy Siemens P1, P2, P3, and classic ITE panelboards. It serves as a direct substitute for the ED43B080. Rated 18 kAIC at 480VAC, it is also HACR rated.
Can I install the E43B080 in a standard residential load center?
No. The E43B080 is a unit mount, bolt-on molded case circuit breaker designed for commercial and industrial applications. It is compatible with Siemens P1, P2, and P3 panelboards, SB switchboards, and legacy ITE panelboards.
What is the direct replacement for the older ED43B080 circuit breaker?
The E43B080 serves as a direct drop-in substitute for the legacy ED43B080, restoring power distribution without requiring a panel upgrade.
Is the E43B080 suitable for use in DC circuits?
Yes. In addition to its AC ratings, this breaker is rated for 30kAIC at 250VDC, making it suitable for specific direct current applications.
Can the E43B080 circuit breaker be reverse fed?
Yes. This thermal magnetic breaker does not have line and load markings, meaning it can be safely reverse fed in applications that require it.
Is this breaker HACR rated for HVAC applications?
Yes. The E43B080 is HACR rated, meaning it is approved for use with heating, air conditioning, and refrigeration equipment.
Does the E43B080 feature a trip-free mechanism?
Yes. The breaker utilizes a trip-free mechanism, ensuring that the contacts will open under fault conditions even if the operating handle is physically held in the ON position.
Are the trip units on the E43B080 interchangeable?
No. The E43B080 features a fixed thermal and fixed magnetic trip unit that is non-interchangeable.
What wire sizes are accepted by the E43B080 lugs?
The factory-installed lugs accept copper or aluminum conductors ranging from 10 AWG to 1/0 AWG.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 25 reviews.
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Reviews Summary
Generated by AI from 30 most recent customer reviews
Last updated 8/15/25
Customers say this electrical breaker meets their expectations in terms of functionality and performance. Many reviews mention quick delivery times and competitive pricing. While one user reports voltage detection issues, most find these units work effectively. Common feedback includes satisfaction with product condition upon arrival and straightforward installation. Reviews indicate availability of specialty models that are often hard to find through local suppliers.