SIEMENS SIRIUS 3RV2
Motor Starter Protector
Product Overview
The Siemens SIRIUS 3RV2021-4DA10 is a compact motor-protection circuit breaker from the SIRIUS 3RV2 family. Designed in frame size S0, it provides reliable protection for three-phase motor circuits against overload and short-circuit conditions.
This model features an adjustable overload release range of 18–25 A, a 325 A instantaneous short-circuit release, CLASS 10 tripping characteristics, and screw terminals with standard switching capacity. Siemens currently lists the article as an active PM300 product.
Key Features
Motor Protection
The integrated thermal overload protection can be adjusted from 18 A to 25 A, allowing the device to be matched to the rated operating current of the protected motor.
Short-Circuit Protection
The instantaneous magnetic short-circuit release operates at 325 A, providing rapid interruption of high fault currents.
CLASS 10 Tripping Characteristic
The CLASS 10 characteristic is intended for conventional motor-starting applications and provides an appropriate balance between motor starting capability and thermal protection.
Compact S0 Housing
The S0 frame size provides a compact solution for motor control panels, starter combinations, and machine-building applications.
Three-Pole Main Circuit
The device has a 3-pole main current circuit, making it suitable for standard three-phase motor protection.
Reliable Screw Connection
The main circuit uses screw terminals for secure and conventional industrial wiring.
Technical Specifications
| Parameter |
Specification |
| Manufacturer |
Siemens |
| Product Family |
SIRIUS 3RV2 |
| Product Type |
Motor Starter Protector / Circuit Breaker |
| Article Number |
3RV2021-4DA10 |
| Frame Size |
S0 |
| Trip Class |
CLASS 10 |
| Adjustable Overload Release |
18–25 A |
| Short-Circuit Release |
325 A |
| Main Circuit |
3-pole |
| Rated Insulation Voltage |
690 V AC |
| Maximum Operating Voltage |
690 V AC |
| Connection Type |
Screw terminals |
| Protection Degree, Front |
IP20 |
| Impulse Voltage Resistance |
6 kV |
| Operating Temperature |
−20 to +60 °C |
| Storage Temperature |
−50 to +80 °C |
| Maximum Installation Altitude |
2,000 m |
| Net Weight |
Approx. 0.370 kg |
| Product Lifecycle |
PM300 – Active Product |
| Country of Origin |
Germany |
| EAN |
4011209712546 |
These specifications are based on Siemens' current product information and technical data sheet.