Siemens Motor protection circuit breaker, spring terminal, 4.5-6.3A Part number 3RV2021-1GA20

Product Overview

The Siemens SIRIUS 3RV2021-1GA20 is a size S0 motor protection circuit breaker (Class 10) designed for switching and protecting three-phase motors. It features an adjustable thermal overload release (4.5 – 6.3 A) and a magnetic short-circuit release rated at 82 A, with spring-type terminals and a compact design for control panels and automation systems.

Key Features

• Class 10 Trip Behaviour: Reliable motor protection under overload conditions
• Adjustable Overload Range: 4.5 – 6.3 A for flexible motor current settings
• Short-Circuit Release: Fixed at 82 A for high fault current protection
• Frame Size: S0 compact footprint for DIN-rail or panel installation
• Terminals: Spring-type terminals for quick, secure wiring
• Switching Capacity: Suitable for demanding motor feeder applications
• Voltage Capability: Operation up to 690 V AC

Technical Specifications

• Product Series: SIRIUS 3RV2 Motor Protection / Circuit Breaker
• Frame Size: S0
• Poles: 3 (three-pole switching)
• Overload Setting Range: 4.5 – 6.3 A
• Magnetic Trip (N-Release): 82 A
• Rated Insulation Voltage (Ui): 690 V
• Surge Withstand Voltage: 6 kV
• Ambient Operating Temperature: –20 °C to +60 °C
• Power Loss (Typical): 7.25 W
• Protection Class: IP20 (front)
• Mounting: Snap-on or screw to 35 mm DIN rail
• Country of Origin: Germany

Compliance & Certifications

• CE Marking: Complies with EU Low Voltage and Machinery Directives
• RoHS Compliant: Manufactured under Siemens substance-restriction policy
• WEEE Directive: Take-back obligations apply in EU markets
• Standards: Meets IEC/EN 60947-2 and IEC 60947-4-1

Applications

Ideal for manual motor starter applications, feeder protection in motor control centres, and industrial automation panels. Commonly used for switching and protecting three-phase motors in manufacturing, packaging, material handling, and machine-tool systems where compact, reliable protection is essential.