Description
The Siemens 3RV2031-4JB10 is a Size S2 Motor Starter Protector (MSP) engineered to deliver dependable overload and short-circuit protection for three-phase and single-phase motors in commercial and industrial HVAC applications. With a current adjustment range of 54–65A and Class 20 trip characteristics, this device is ideally suited for protecting motors that require a longer tripping time under overload conditions — a common requirement for HVAC compressors, fans, and pump motors with high inertia loads.
Built to Siemens’ 3RV2 platform, the 3RV2031-4JB10 combines motor protection and manual switching in a single compact unit, eliminating the need for separate fusing in many applications. The screw terminal connection style ensures a secure, vibration-resistant electrical connection for demanding mechanical environments.
Key Features
- Current setting range: 54–65A
- Trip class: Class 20 (extended overload protection for high-inertia loads)
- Frame size: S2
- Connection type: Screw terminals
- Provides integrated overload and short-circuit protection
- Manual ON/OFF switching capability
- Compact design for panel space savings
- Compatible with Siemens 3RV2 series accessories and bus bar systems
Typical Applications
- HVAC compressor motor protection
- Condenser and evaporator fan motor protection
- Hydronic circulator and pump motor protection
- Commercial air handling unit (AHU) motor circuits
- Industrial motor control centers (MCCs)
Why Choose the Siemens 3RV2031-4JB10?
The 3RV2 series MSPs are a trusted solution in motor protection, offering a combination of reliability, modularity, and ease of installation. Class 20 tripping ensures motors with longer acceleration times — such as those driving large fans or compressors — are not nuisance-tripped during startup, while still providing robust protection against sustained overloads and short circuits. The screw terminal design simplifies field wiring and maintenance, making this unit a practical choice for HVAC technicians and electrical contractors alike.
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