SQ40E-63 series smallest-volume auto-transfer power switch (ATSE for short hereinafter) is the outspread products of Sq40 series mainly consists of two ZB30 series MCB and single motor operational mechanism in dualinterlockings of machinery and electrodynamic, and intelligent controller. It is of super small volume, high reliability, full protective functions convenient to operate honored with many state patents. It is suitable in the dual-loop power supply system of terminals. However if the higher short-circuit breaking capacity is needed, the SQ40-63 series is better.

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