Siemens Circuit breaker, size S00 for system protectionProduct Overview The SIRIUS 3RV2 circuit breaker is a high performance, thermal magnetic motor protection circuit breaker designed for system protection with full UL 489 and CSA C22. 2 No. 5 02 approval. This frame size S00 circuit breaker features thermal overload release at 15A and short circuit release at 208A with screw terminal connections and standard switching capacity. Key Features This circuit breaker is optimized for system protection