Overview
The Siemens 3RV1421-1DA10 is a circuit breaker-type motor starter protector in the classic 3RV1 series. This compact S0-sized device provides thermal-magnetic protection suitable for transformer protection and small-to-medium motor circuits in industrial automation systems. With adjustable A-release characteristics and a fixed short-circuit release, it integrates seamlessly into control panels using screw terminal connection.
Key Features
- Adjustable A-release (overload) setting: 2.2–3.2 A
- Short-circuit release (instantaneous trip): 65 A
- Screw terminal connection for secure panel mounting
- Rotary ON/OFF operator for manual control
- Class 10 thermal-magnetic tripping characteristic
- Standard switching capacity and compact footprint
Technical Specifications
- Part Number: 3RV1421-1DA10
- Series: 3RV1 (SIRIUS Classic)
- Size Category: S0 (Compact)
- A-Release (Overload) Range: 2.2–3.2 A
- Short-Circuit Release: 65 A (instantaneous)
- Terminal Type: Screw terminals
- Operator Type: Rotary ON/OFF
- Trip Class: Class 10 (standard industrial duty)
- Application: Transformer protection, general motor control
Typical Applications
The 3RV1421-1DA10 is well-suited for:
- Transformer protection circuits in distributed control systems
- Small AC motor protection (≤1 HP at reduced duty)
- Control transformer primaries and general load protection
- Panel-mounted overload/short-circuit protection in legacy or retrofit installations
- Systems requiring manual trip/reset capability with thermal-magnetic response
Compatibility & Replacements
The 3RV1421-1DA10 represents a legacy motor starter protector design. Siemens successor type is the 3RV2411-1DA10 (SIRIUS 3RV2 series), which offers enhanced performance and additional functionality while maintaining screw-terminal compatibility in many applications. Before specifying a replacement, verify mounting style, terminal arrangement, and panel layout to ensure drop-in suitability. This used unit is ideal for repair, maintenance, or expansion of existing 3RV1-based control systems.
