The Siemens 3RV2021-4FA10 is a premium Motor Protection Circuit Breaker (MPCB) from the globally trusted SIRIUS 3RV2 series, engineered to provide reliable overload protection, short-circuit protection, phase failure protection, and safe electrical isolation for three-phase motors. With an adjustable overload current range of 34–40A and a 480A magnetic short-circuit release, this Class 10 motor protection circuit breaker ensures fast and accurate tripping, helping prevent motor damage, reduce downtime, and improve the reliability of industrial electrical systems. It features a compact S0 frame size, 3-pole construction, screw terminal connections, and standard switching capacity, making it ideal for demanding industrial applications.
The Siemens 3RV2021-4FA10 is suitable for protecting three-phase induction motors up to 18.5 kW at 400V AC-3 and is widely used in Motor Control Centers (MCC), industrial control panels, DOL starters, Star-Delta starters, pump control systems, compressors, conveyor systems, HVAC plants, water treatment facilities, packaging machinery, OEM equipment, and factory automation. It integrates seamlessly with Siemens SIRIUS contactors, enabling compact, efficient, and dependable motor starter combinations for continuous industrial operation.
At SB Smart, Faridabad, we supply 100% genuine Siemens SIRIUS Motor Protection Circuit Breakers, contactors, overload relays, soft starters, MCCBs, MCBs, and industrial automation products at competitive prices. We provide GST invoices, expert technical support, bulk order discounts, secure packaging, and fast delivery across Faridabad, Delhi NCR, and all major cities in India, making SB Smart a trusted partner for OEMs, panel builders, industries, and electrical contractors.
Genuine Siemens SIRIUS 3RV2 Motor Protection Circuit Breaker
Model: 3RV2021-4FA10
Frame Size: S0
Adjustable Overload Setting: 34–40A
Magnetic Short-Circuit Release: 480A
Class 10 Thermal Trip Characteristic
Standard Switching Capacity
3-Pole Configuration
Screw Terminal Connections
Rated Operating Voltage: 220–690V AC
Suitable for Motors up to 18.5 kW at 400V AC-3
Phase Failure Protection
Compatible with Siemens SIRIUS Contactors
Compact and Rugged Industrial Design
Motor Control Centers (MCC)
Industrial Automation Panels
DOL Motor Starters
Star-Delta Motor Starters
Pump Control Panels
Compressors
Conveyor Systems
HVAC Systems
Water Treatment Plants
Packaging Machinery
OEM Electrical Panels
Factory Automation
Protects motors against overload and short-circuit faults
Minimizes equipment damage and production downtime
Improves electrical safety and motor reliability
Compact design saves valuable control panel space
Easy installation with secure screw terminals
Long mechanical and electrical service life
Low maintenance with dependable industrial performance
Ideal for continuous-duty motor applications
The Siemens 3RV2021-4FA10 is a Motor Protection Circuit Breaker (MPCB) designed to protect three-phase motors against overload, phase failure, and short-circuit faults while providing safe electrical isolation.
It features an adjustable thermal overload setting from 34A to 40A, allowing precise protection for industrial motors.
The breaker is equipped with a 480A magnetic short-circuit release, ensuring rapid fault interruption and reliable motor protection.
Yes. The 3RV2021-4FA10 is fully compatible with Siemens SIRIUS contactors and is widely used in DOL and Star-Delta motor starter panels.
SB Smart, Faridabad supplies 100% genuine Siemens industrial products with competitive pricing, expert technical support, GST invoices, bulk order assistance, and fast delivery across Faridabad, Delhi NCR, and throughout India.
| Parameter | Specification |
|---|---|
| Brand | Siemens |
| Series | SIRIUS 3RV2 |
| Model Number | 3RV2021-4FA10 |
| Product Type | Motor Protection Circuit Breaker (MPCB) |
| Frame Size | S0 |
| Thermal Overload Setting (A-Release) | 34.00–40.00 A |
| Magnetic Trip (N-Release) | 480 A |
| Tripping Class | Class 10 |
| Number of Poles | 3 |
| Rated Operational Voltage | 20–690 V AC |
| Rated Continuous Current | 40 A |
| Rated Insulation Voltage | 690 V |
| Rated Impulse Withstand Voltage | 6 kV |
| Operating Frequency | 50/60 Hz |
| Connection Type | Screw Terminal |
| Switching Capacity | Standard |
| Degree of Protection | IP20 |
| Mechanical Endurance | 100,000 Operating Cycles |
| Operating Temperature | -20°C to +40°C |
| Storage Temperature | -50°C to +80°C |
| Maximum Installation Altitude | 2,000 m |
| Relative Humidity | 10–95% |
| Approximate Weight | 0.38 kg |
| Mounting | 35 mm DIN Rail / Panel Mount |
| Application | Motor Overload and Short-Circuit Protection |
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