The Siemens SIRIUS Motor Protection Circuit Breaker (MPCB) – 3RV2121-4BA10 is a high-performance motor protection device designed to safeguard three-phase motors against overload, short-circuit, and phase failure conditions. As part of the trusted Siemens SIRIUS 3RV2 series, this motor protection circuit breaker combines motor protection, isolation, and switching functions in a compact unit, making it an ideal solution for industrial motor control applications. The 3RV2121-4BA10 is a Class 10 motor protection circuit breaker with an integrated thermal overload relay function for dependable motor protection.
The Siemens 3RV2121-4BA10 MPCB is widely used in Motor Control Centers (MCC), Direct-On-Line (DOL) starters, Star-Delta starters, industrial control panels, pump control systems, compressors, conveyor systems, machine tools, HVAC equipment, manufacturing plants, OEM machinery, and industrial automation systems. It helps protect motors from electrical faults, reduces equipment damage, minimizes downtime, and improves overall system reliability.
Designed with Siemens' advanced engineering and durable construction, this SIRIUS Motor Protection Circuit Breaker offers reliable switching performance, long service life, and easy installation. It is trusted by panel builders, OEMs, electrical contractors, maintenance engineers, and industrial professionals who require dependable motor protection for demanding industrial environments.
At SB Smart, we supply genuine Siemens SIRIUS Motor Protection Circuit Breakers, motor starter protectors, and industrial electrical products with competitive pricing, expert technical support, bulk order assistance, and fast PAN India delivery.
Genuine Siemens SIRIUS Motor Protection Circuit Breaker
Reliable overload and short-circuit protection
Integrated thermal overload relay function
Class 10 motor protection
Provides motor isolation and switching
Compact and space-saving design
Durable industrial-grade construction
Easy installation and maintenance
Long operational service life
Trusted Siemens quality and engineering
Motor Control Centers (MCC)
Direct-On-Line (DOL) Starters
Star-Delta Starters
Industrial Control Panels
Pump Control Systems
Compressor Panels
Conveyor Systems
Machine Tools
HVAC Systems
Manufacturing Plants
Water Treatment Plants
Cement Plants
Steel Plants
OEM Machinery
Industrial Automation Systems
Protects motors against overload and short-circuit faults
Helps prevent motor overheating and damage
Improves operational safety
Reduces maintenance costs and downtime
Extends motor service life
Ensures reliable motor starting and operation
Easy integration into motor starter assemblies
Suitable for continuous industrial applications
Cost-effective motor protection solution
100% Genuine Siemens Products
Competitive Industrial Pricing
Expert Technical Support
Bulk Order Assistance
Fast PAN India Delivery
Secure Packaging
Trusted Industrial Electrical Supplier
GST Invoice Available
Responsive Customer Support
It is used to protect three-phase electric motors against overload, short-circuit, and phase failure in industrial motor control systems.
It is commonly installed in MCC panels, DOL starters, star-delta starters, industrial control panels, pump systems, compressors, conveyors, and OEM machinery.
The SIRIUS 3RV2 series combines motor protection, switching, and isolation in a compact device, offering reliable performance, long service life, and easy integration into motor starter assemblies.
It is widely used in manufacturing plants, water treatment facilities, HVAC systems, food processing, cement, steel, mining, and industrial automation applications.
Yes. SB Smart supplies genuine Siemens SIRIUS motor protection circuit breakers with competitive pricing, expert technical support, bulk order assistance, and fast PAN India delivery.
| Parameter | Specification |
|---|---|
| Brand | Siemens |
| Series | SIRIUS 3RV2 |
| Model Number | 3RV2121-4BA10 |
| Product Type | Motor Protection Circuit Breaker |
| Function | Motor Protection with Overload Relay Function |
| Frame Size | S0 |
| Tripping Class | Class 10 |
| Thermal Overload Release (A-Release) | 13.00–20.00 A |
| Short-Circuit Release (N-Release) | 260 A |
| Number of Poles | 3 |
| Rated Operational Voltage | 20–690 V AC |
| Rated Operational Current | 20 A |
| Rated Insulation Voltage | 690 V |
| Rated Impulse Withstand Voltage | 6 kV |
| Frequency | 50/60 Hz |
| Connection Type | Screw Terminal |
| Switching Capacity | Standard |
| Degree of Protection | IP20 |
| Mechanical Endurance | 100,000 Operating Cycles |
| Electrical Endurance | 100,000 Operating Cycles |
| Operating Temperature | -20°C to +60°C |
| Storage Temperature | -50°C to +80°C |
| Maximum Installation Altitude | 2000 m |
| Relative Humidity | 10–95% |
| Approximate Weight | 0.420 kg |
| Mounting | DIN Rail Mounting |
| Application | Motor Overload and Short-Circuit Protection |
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