Overview
The Siemens 3RV1021-1DA10 is a compact motor protection circuit breaker (MPCB) from the SIRIUS 3RV1 control series. Part of Siemens’s proven industrial automation portfolio, this 3-pole breaker provides precise overload and short-circuit protection for low-power AC motors up to approximately 2.2 kW (depending on supply voltage). Its adjustable thermal release is set between 2.2 and 3.2 A, making it suitable for a wide range of small motor applications in manufacturing, machinery, and process control environments.
Key Features
- 3-pole main circuit for balanced protection across all phases
- Adjustable thermal overload release rated 2.2–3.2 A; instantaneous short-circuit release at 42 A for fast fault clearing
- Class 10 tripping characteristics per IEC 60947-4-1, ensuring rapid response to motor overload conditions
- Integrated TRIPPED indicator and TEST function for quick diagnostics and field verification
- Manual ON/OFF rotary dial for easy current setting adjustment and operator control
- Rated 690 V AC/DC with 100 kA breaking capacity, meeting industrial-grade fault protection standards
- Screw terminal connection (solid or stranded conductors, AWG 14–10) for reliable field wiring
- DIN-rail mounting on standard 35 mm rail for compact panel integration
Technical Specifications
- Adjustable thermal release (A-release): 2.2–3.2 A
- Instantaneous short-circuit release (N-release): 42 A
- Rated operating voltage: 690 V AC/DC
- Rated operating current (AC-3, at 400 V): 3.2 A
- Service power (AC-3, at 400 V): 1.1 kW
- Number of poles: 3
- Breaking capacity: 100 kA at 690 V
- Maximum switching frequency (AC-3): 15 operations per hour
- Mechanical service life (main contacts): 100,000 cycles typical
- Power loss (total, typical): 6 W
- Surge voltage withstand: 6 kV
- Protection class (front): IP20
- Ambient operating temperature: −20 to +60 °C
- Storage/transport temperature: −50 to +80 °C
- Installation altitude (max): 2,000 m above sea level
- Shock resistance: 25 g / 11 ms
- Wire size (main contacts): 1–6 mm² solid or stranded; AWG 14–10
- Auxiliary contact rating: 1 changeover contact for signaling/interlocks
- Weight: ~350 g
- Mounting: DIN-rail (35 mm standard)
- Certifications: IEC 60947-4-1, VDE 0660, CE marked
Typical Applications
- Compact motor control panels – Protection for single-phase or three-phase AC induction motors in factory automation and machinery
- Industrial pump and fan drives – Reliable overload cutout for centrifugal pumps, compressors, and ventilation fans
- Machine tool protection – Motor safeguarding in CNC, drilling, milling, and turning machines
- HVAC and process systems – Thermal and magnetic protection for heating, cooling, and water circulation motors
- DIN-rail control assemblies – Space-efficient starter and protection modules for distributed control nodes
Compatibility & Replacements
Compatible With
- Siemens SIRIUS contactors and starters (3RT2, 3RT3 series)
- Siemens TIA Portal engineering software for documentation and commissioning
- IEC 60947 compliant three-phase and single-phase AC motor circuits
- DIN-rail enclosures and standard 35 mm top-hat rails
- 220 V to 690 V AC industrial distribution systems
- Pilot control relays and auxiliary signaling modules
Replaces / Drop-In Replacement For
- Earlier Siemens 3RV1 series breakers (verify part number for exact compatibility)
- Confirm replacement compatibility with your system integrator before ordering, as motor protection settings and voltage ratings must match the load profile.
Works With
- IEC 60947-4-1 Class 10 motor starter schemes (contactor + overload relay equivalent)
- Siemens SIRIUS ecosystemcontrol platforms and motor starter modules
- Eaton, ABB, and Schneider motor starters using standard 690 V three-phase circuits (verify application-specific compatibility)
- Standard DIN-rail automation architectures and distributed control systems
