Description
Siemens 3RV2021-4DA10 Motor Protector Overview
The Siemens 3RV2021-4DA10 is a manual motor starter and motor protector engineered to deliver dependable overload and short-circuit protection for three-phase motors in commercial and industrial HVAC applications. Rated at 690V and 25A with a compact Size S0 frame, this device combines motor protection and switching functions in a single, space-saving unit — ideal for motor control centers, panel boards, and direct-on-line motor starters.
Key Features
- Rated voltage: 690V AC
- Rated current: 25A
- Poles: 3-Pole (3P)
- Frame size: S0 (Size S0)
- Integrated overload and short-circuit protection in one device
- Manual ON/OFF switching capability
- Adjustable overload trip range for precise motor protection
- Compact design suitable for DIN rail or panel mounting
- Part of the Siemens 3RV2 series — a proven platform for motor protection
Application
The 3RV2021-4DA10 is well-suited for protecting three-phase motors in HVAC systems including compressors, fan motors, pump motors, and air handling units. Its robust construction and reliable trip characteristics make it a trusted choice for OEM equipment builders, mechanical contractors, and industrial maintenance teams.
Why Choose the Siemens 3RV2021-4DA10
- Combines motor protection and manual switching in one compact unit
- Eliminates the need for separate overload relays and circuit breakers
- Designed for ease of installation and panel integration
- Backed by Siemens’ global reputation for electrical reliability and quality
- Compatible with Siemens 3RV2 series accessories and add-on modules
