The Siemens SIRIUS 3RV2742-5ED10 is a size S3 circuit breaker rated 30 A operational current at 50/60 Hz, designed for system protection per UL 489 and CSA C22.2 No. 5.
The 70 mm width and 170 mm height fit standard S3 footprint; 176 mm depth leaves room behind the gland plate. Clearance: 70 mm above and below, 10 mm at the sides. Screw-type terminals on main contacts accept 2x (2.5...16 mm²) solid or 1x (10...70 mm²) stranded; M8 bolts with 4 mm hexagonal socket drive.
Protection and lifecycle
Thermal overload release and magnetic short-circuit trip. No ground-fault or phase-failure detection onboard — those require an add-on module or auxiliary switch (product extension supports auxiliary switch fit). Rated operational power dissipation 14 W at AC in hot state. Mechanical endurance typical 25,000 operations on main and auxiliary contacts. Substance prohibition compliance date 03/01/2017 (RoHS). Current lifecycle stage per manufacturer — production active, no phase-out notice.