Description
The Siemens 3RV2021-4CA10 is a motor starter protector engineered for reliable motor branch-circuit protection in commercial and industrial HVAC and mechanical systems. Combining manual motor starting with built-in overload and short-circuit protection in a single compact device, this unit simplifies panel design and reduces wiring complexity.
Product Overview
The 3RV2021-4CA10 belongs to Siemens’ proven 3RV2 series of motor starter protectors. Designed for three-phase motor applications, it provides thermally compensated overload protection alongside magnetic short-circuit tripping — eliminating the need for separate overload relays in many installations.
Key Features
- Current setting range: 17–22 A
- Integrated overload and short-circuit protection in one device
- Manual ON/OFF/TRIP switching function
- Thermally compensated bimetallic overload trip for accurate protection across ambient temperature variations
- Magnetic instantaneous short-circuit release for fast fault clearance
- Compact design suitable for DIN rail or direct panel mounting
- Suitable for use in DOL (direct-on-line) motor starter assemblies
- Compatible with Siemens 3RV2 series accessories including auxiliary contacts, terminal covers, and busbar systems
Typical Applications
- HVAC fan and blower motor protection
- Pump motor branch-circuit protection
- Compressor and refrigeration motor control panels
- Commercial and light industrial motor control centers (MCCs)
- Building automation and mechanical room motor starters
Why Choose Siemens 3RV2 Series
Siemens 3RV2 motor starter protectors are globally recognized for their reliability, precise trip characteristics, and modular expandability. The integrated protection function reduces component count, saves panel space, and speeds up installation — making them a preferred choice for HVAC contractors and panel builders alike.
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