Description
The Siemens 3RV2021-4AA10 is a compact, high-performance Motor Starter Protector (MSP) from the 3RV2 series, engineered to provide reliable motor branch circuit protection in a single, integrated device. Designed for Size S0 applications, this unit combines overload protection, short-circuit protection, and manual motor switching into one space-saving package — eliminating the need for separate fuses or circuit breakers in many motor control installations.
Key Features
- Current adjustment range: 11–16 A FLA (Full Load Amperes)
- Size S0 frame — compact footprint for panel space savings
- Integrated overload and short-circuit protection in a single device
- Manual ON/OFF switching capability for local motor isolation
- Trip-free mechanism prevents reset under fault conditions
- Compatible with Siemens 3RT2 contactors for direct combination starter assemblies
- Screw terminal connections for reliable field wiring
- DIN rail mountable for easy panel installation
Protection & Performance
- Provides Class 10 motor overload protection
- Short-circuit current rating suitable for motor branch circuit protection per applicable standards
- Bimetallic overload trip element with temperature compensation
- Magnetic instantaneous short-circuit release for fast fault clearing
- Lockable handle for lockout/tagout (LOTO) compliance
Electrical Specifications
- Current Setting Range: 11–16 A
- Frame Size: S0
- Number of Poles: 3
- Mounting: DIN rail or direct mounting
- Terminal Type: Screw terminals
Applications
The 3RV2021-4AA10 is ideal for protecting three-phase AC motors in HVAC, industrial, and commercial building automation applications. Common uses include air handling unit fan motors, pump motors, compressor motors, and other motor-driven HVAC equipment requiring dependable branch circuit protection.
Why Choose the Siemens 3RV2 Series?
The 3RV2 series Motor Starter Protectors are globally recognized for their robust construction, precise current adjustment, and seamless integration with Siemens contactor and soft-starter product families. Their modular design supports accessories such as auxiliary contact blocks, shunt releases, and undervoltage releases, making them highly adaptable to complex motor control panel requirements.
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