The Siemens 3RV1021-1DA15 is a SIRIUS 3RV1 series motor protection circuit breaker designed for reliable overload and short-circuit protection of three-phase motors. It features an adjustable overload release (A-release) range of 2.2–3.2 A, a fixed short-circuit release (N-release) at 42 A, and Class 10 tripping characteristics. The unit is supplied with a transverse-mounted auxiliary switch block (1 NO + 1 NC) pre-installed and uses screw terminals for main circuit connections.
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