Siemens EF3A125 – 125A 3 Pole Motor Circuit Protector Crafted

Rated for 600VAC systems, this 125A instantaneous-only device isolates motor circuits during severe fault conditions. The magnetic-only architecture ignores temporary startup spikes while providing rapid disconnection during actual short circuits. Mounting via a standard bolt-on configuration, it fits legacy I-T-E panelboards and Siemens FC-20 switchboards. Maintenance teams often deploy this exact match for aging infrastructure, though the ED63A125 serves as the modern replacement.