Siemens Industry, Inc. 3RV2742-5FD10 Circuit Breaker

Siemens Industry, Inc. 3RV2742-5FD10 is a SIRIUS 3RV2 motor protection circuit breaker, size S3, designed for system protection with UL 489 and CSA C22.2 No.5-02 approvals. This three-pole AC device handles main voltages from 20 to 600 V at 50–60 Hz and is rated for 35 A continuous operation, with an instantaneous release (N-release) of 455 A and an overload release (A-release) of 35 A, and it features screw terminals for straightforward wiring. Weighing about 2.263 kg, it is built for industrial environments with an insulation voltage of 1,000 V (pollution degree 3), a surge voltage resistance of 8 kV, and a mechanical/shock tolerance of 25 g/11 ms. Its electrical endurance is rated for roughly 25,000 cycles for main and auxiliary contacts, with a typical power loss of 14 W total (4.7 W per pole) at rated current. The unit supports operation from -20 to +60 C and storage from -50 to +80 C, with a storage/humidity range of 10–95% RH and installation up to 2,000 m above sea level. In practice, 3RV2742-5FD10 is used in industrial control panels and machinery where UL 489/CSA No.5-02-compliant protection is required, combining three poles of protection for the main circuit with screw-terminal connectivity and compatibility with standard S3-size motor protection schemes.