The Siemens 3RV2021-1DA10-ZW96 is a SIRIUS-branded motor protection circuit breaker designed to protect three-phase induction motors against overload and short-circuit. It carries a Class 10 trip characteristic, meaning it will trip within 10 seconds at 7.2× the thermal setting — fast enough to protect standard motors during a stall or locked-rotor event without nuisance tripping on normal starting inrush. The unit is rated for a 100 kA breaking capacity at 400 V AC, which covers most industrial distribution panels where the prospective fault current is high.
Mounting and panel fit
Mounts via screw fixing or snaps directly onto a 35 mm standard mounting rail per DIN EN 60715. The 45 mm width and 97 mm depth mean it occupies a single modular slot on the rail, leaving room for auxiliary contact blocks or a separate contactor alongside. Clearance requirements: 50 mm above and below, 30 mm to the side, zero forward or backward — so it fits tight against a backpanel or gland plate as long as vertical airflow is respected.
Breaking capacity across voltage levels
Breaking capacity is voltage-dependent: 100 kA at 240 V and 400 V AC, dropping to 10 kA at 690 V. At 480 V and 600 V the unit is rated for 3.2 A continuous. This is a motor-protective device, not a general-purpose distribution breaker — the 100 kA rating at 400 V means it can be installed on a high-fault panel without requiring an upstream current-limiting fuse, as long as the motor full-load current falls within the adjustable thermal range.
Environmental and operational limits
Rated for operation between -20 °C and +60 °C with temperature compensation active across that same span. Storage and transport range extends from -50 °C to +80 °C. Any mounting position is acceptable. The unit includes phase failure detection but no ground fault detection — if ground fault protection is required on the motor circuit, it must be added externally via a separate module or upstream device.
Lifecycle stage is listed as current, meaning the manufacturer has not issued a phase-out notice. This part is sourced to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at quote time.