Description
The Siemens 3RV2021-1JA10 is a compact, reliable Motor Starter Protector (MSP) engineered for the protection of three-phase and single-phase motors in industrial and commercial HVAC applications. Combining short-circuit protection, overload protection, and manual on/off switching in a single device, this unit eliminates the need for separate fusing and simplifies panel design.
Key Features
- Adjustable current setting range: 7–10 A
- Integrated short-circuit and overload protection in one compact unit
- Manual motor switching capability — functions as a local disconnect
- Screw-type terminal connections for secure, reliable wiring
- Part of the Siemens 3RV2 series — designed for use with SIRIUS modular system components
- Compatible with Siemens 3RT contactors and 3RV2 accessories for full motor starter assemblies
- DIN rail mountable for easy panel installation
- Compact S00 frame size for space-saving enclosure layouts
Protection Functions
- Overload protection with adjustable trip class
- Short-circuit protection (instantaneous magnetic trip)
- Phase failure sensitivity to protect motors from single-phasing
- Trip indication for fast fault diagnosis
Applications
- HVAC motor control panels — air handlers, chillers, cooling towers
- Pump and fan motor protection
- Commercial and light industrial motor branch circuit protection
- Direct-on-line (DOL) motor starter assemblies
Product Specifications
- SKU / Part Number: 3RV2021-1JA10
- Brand: Siemens
- Current Range: 7–10 A (adjustable)
- Frame Size: S00
- Series: SIRIUS 3RV2
- Mounting: DIN rail
- Connection Type: Screw terminals
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