Motor protection circuit breaker for panel integration
The Siemens 3RV2021-1FA10-ZW97 is a SIRIUS motor protection circuit breaker with Trip Class 10 thermal release and phase failure detection. Breaking capacity is 100 kA at both 240 V and 400 V AC, which covers most industrial distribution panels up to that fault level without needing an upstream current-limiting fuse. The 45 mm wide housing snaps onto 35 mm DIN rail per DIN EN 60715, and the screw terminals accept conductors up to 10 mm² stranded.
Lifecycle and sourcing posture
The 3RV2021-1FA10-ZW97 has a current lifecycle stage, meaning it remains in active Siemens production and distribution. The part is sourced to order through independent distribution; availability and pricing are confirmed at quote time.
Mounting and wiring constraints
Mounting position is any, so the breaker can be oriented vertically or horizontally inside the panel. Minimum clearance around the device: 50 mm upward, 50 mm downward, and 30 mm to the side — no clearance needed forward or backward. The main circuit terminals are M4 screws, and the terminal capacity is 2 × (1 to 2.5 mm²) or 2 × (2.5 to 10 mm²) solid or stranded. Ambient operating temperature range is -20 to +60 °C; storage and transport range is -50 to +80 °C.
Duty cycle and switching capacity
Maximum switching frequency in AC-3 duty (motor starting) is 15 operations per hour. At 690 V, the breaking capacity drops to 4 kA, so verify the available fault current at that voltage level. The rated operational voltage range is 20 to 690 V, covering most low-voltage motor circuits.