Motor protection circuit breaker, 1.25 A, CLASS 10 — SIRIUS 3RV1021-0KA10-ZW97
The Siemens 3RV1021-0KA10-ZW97 is a SIRIUS motor protection circuit breaker rated for 1.25 A continuous current, sized for a 0.37 kW motor at 400 V AC. No ground fault detection on this variant.
Mounting and wiring — DIN rail, 45 mm wide, screw terminals
The 45 mm width fits a standard 9 mm pitch panel layout — five modules wide. Depth is 96 mm, height 97 mm, leaving clearance for adjacent devices and wire bends. No side or backward clearance required. Main circuit terminals accept solid or stranded conductors: 2× (1…2.5 mm²) and 2× (2.5…6 mm²), or AWG 14–10. Screw-type terminals — torque to the manufacturer's spec for reliable connection. No auxiliary contacts included (0 supplied), but an auxiliary switch can be added externally.
Shock resistance is 25 g for 11 ms — suitable for machine-mounted applications with moderate vibration. Mechanical endurance of the main contacts is typically 100,000 operations. Maximum switching rate at AC-3 duty is 15 operations per hour.