ABB E1B-A08-800A-3P-PR121 Low Voltage Circuit Breaker

The ABB SACE E1B-A08-800A-3P-PR121 is a three-pole low-voltage circuit breaker from ABB’s E1B family, built around an 800 A frame and equipped with a PR121 trip unit (variants LI, LSI, or LSIG are available). It protects industrial feeders and distribution panels by interrupting fault currents and overloads to prevent damage to downstream equipment. Verified specifications include a nominal current rating of 800 A and an interrupting capacity (Icu) up to 42 kA, with PR121 trip units offering the protection functions associated with these modules in a 3P configuration. The E1B-A08 frame is designed for compact protection within low‑voltage switchgear and is compatible with ABB protection architectures that use PR121-based protection schemes. Typical applications include large feeders in manufacturing facilities, distribution panels for industrial plants, and other heavy-load installations where reliable overcurrent protection for multiple phases is required.