Siemens Circuit breaker for transformer protection, size S00Product Overview The SIRIUS 3RV2 motor protection circuit breaker is a compact, current limiting device designed for transformer protection applications. This size S00 circuit breaker features an A release range of 7 10A and N release of 208A with screw terminal connections and standard switching capacity. Key Features This motor protection circuit breaker provides essential protection for electrical motors and transformers through a thermal overload