Overview
The Siemens 3RV2021-4AA10 is a size S0 motor protection circuit breaker from the SIRIUS 3RV2 product line, engineered for reliable overload and short-circuit protection in three-phase motor applications. This thermomagnetic breaker combines adjustable thermal protection (10–16 A) with fixed magnetic protection (208 A) to safeguard motors and connected equipment against electrical faults. The unit’s compact footprint and DIN rail compatibility make it ideal for space-constrained industrial panels and motor starter control systems.
Key Features
- Class 10 tripping characteristics per IEC 60947-4-1 for balanced overload sensitivity
- Adjustable thermal trip range: 10–16 A; magnetic release fixed at 208 A
- Three-pole (3P) configuration for three-phase motor protection
- Rotary on/off handle with lockable mechanism and phase-loss detection
- Temperature-compensated bimetal trip units minimize power loss and control cabinet heating
- Compact dimensions: 97 mm H × 45 mm W × 91 mm D for efficient panel layout
- Rated current: 16 A; maximum voltage: 690 V AC; frequency: 50/60 Hz
Technical Specifications
- Frame Size: S0 (compact)
- Product Designation: Circuit Breaker for Motor Protection
- Thermal Trip (A-Release): 10–16 A adjustable
- Magnetic Trip (N-Release): 208 A fixed
- Rated Current: 16 A nominal
- Rated Voltage: 690 V AC maximum
- Breaking Capacity: 55 kA at 400 V AC; 4 kA at 690 V AC
- Switching Capacity (AC-3): 11 kW at 690 V, 7.5 kW at 400 V
- Frequency: 50/60 Hz
- Tripping Class: Class 10 per IEC 60947-4-1
- Insulation Voltage: 1000 V (degree of pollution 3)
- Impulse Voltage Withstand: 6 kV
- Operating Temperature Range: −20 to +60 °C
- Altitude Rating: Up to 2000 m
- Connection Type: Screw terminals (M4)
- Wire Gauge: 16–12 AWG (main circuit), 14–8 AWG (auxiliary)
- Mounting: DIN rail snap-on / 35 mm standard rail per DIN EN 60715
- Protection Class: IP20
- Active Power Loss: 8.3 W (at rated current); 3.1 W per pole
- Pollution Degree: 3
- Certifications: ATEX, CCC, CSA, EAC, UL; RoHS compliant
Typical Applications
- Three-phase AC motor protection (AC-3 duty cycle up to 11 kW at 690 V)
- Pump, fan, and compressor motor control
- General purpose feeder protection in industrial control cabinets
- OEM equipment and machinery motor starter assemblies
- Machine tools, conveyors, and production line drives
Compatibility & Replacements
Compatible With
- Siemens SIRIUS 3RV2 motor starter contactors (sizes S00, S0, S2)
- DIN 43880 standard 35 mm mounting rails
- Industrial control panels using IEC 60947-4-1 compliant breakers
- AC-3 rated motor load feeders up to 11 kW (690 V AC)
Replaces / Drop-In Replacement For
- Legacy Siemens 3RV1021-4AA10 (earlier generation 3RV1 series)
- Direct equivalent in SIRIUS 3RV2 lineup for size S0 applications
Works With
- Siemens SIRIUS control relay modules and timers
- Standard IEC circuit protection standards (IEC 60947-4-1, EN 60947-4-1)
- Thermal overload relays and solid-state starters in auxiliary circuits
- Industrial networks: ProfiNet, MODBUS, EtherCAT (when integrated via gateway modules)
