SCND69120ANGTH – SIEMENS 3P1200A 600V 100% RATED LSIG BREAKER

LSIG stands for Long-time, Short-time, Instantaneous, and Ground-fault — the four independent protection functions built into the trip unit of this breaker. Each function is typically adjustable, allowing engineers to precisely coordinate this 1200A breaker with upstream and downstream devices. This is essential in large commercial or industrial distribution systems where selective coordination is required by the Canadian Electrical Code (CEC) to minimize the scope of outages during a fault.

A standard breaker is derated to 80% of its nameplate rating for continuous loads (loads lasting 3 hours or more), meaning a standard 1200A breaker could only serve 960A continuously. The 100% rating on the SIESCND69120ANGTH allows the full 1200A to be used for continuous loads, provided it is installed in a listed enclosure also rated for 100% duty. This can result in a smaller, more cost-effective installation compared to upsizing to a 1600A standard-rated breaker.

Yes — Northern Breaker Group specialises in sourcing obsolete, discontinued, and hard-to-find breakers across Canada. To ensure we source the correct unit or a verified equivalent, have the following ready: the full nameplate part number (SIESCND69120ANGTH), the interrupting rating required for your system, any zone-selective interlocking (ZSI) requirements, and the switchboard or panelboard make and model. Contact us at any of our Calgary, Edmonton, or Vancouver counters or request a quote online.