Motor protection circuit breaker — 3RV1031-4FA10-ZW98
The Siemens 3RV1031-4FA10-ZW98 is a SIRIUS-series motor protection circuit breaker, rated 40 A continuous current and 18.5 kW at 400 V AC. Breaking capacity runs 100 kA at 240 V AC, 50 kA at 400 V AC, 10 kA at 500 V AC, and 4 kA at 690 V AC (–).
The 55 mm width and 140 mm height leave room for adjacent contactors or overloads in a motor starter lineup. Screw-type box terminals on the main circuit accept 2x (0.75–16 mm²) solid or 2x (0.75–25 mm²) stranded, with a single termination up to 35 mm². That's enough for 40 A motor feeds with standard THHN or PVC cable. Auxiliary and control circuits also use screw terminals, and the breaker accepts an auxiliary switch add-on.