Siemens Circuit breaker, size S0, class 10A-release 2.8-4A, N release, 52A Part number 3RV2021-1EA15

Product Overview

The Siemens SIRIUS 3RV2021-1EA15 is a three-pole motor protection circuit breaker, size S0, designed for reliable switching and protection of small 3-phase motors and load feeders. It features an adjustable thermal overload release ranging from 2.8 A to 4 A, a magnetic short-circuit trip unit rated at 52 A, and includes one NO + one NC auxiliary contact for status indication and control functions.

Key Features

• Adjustable Overload Release Range: 2.8 A to 4 A
• Frame Size S0: Compact footprint for control panels
• Trip Class: Class 10 (overload) for motor protection
• Auxiliary Contacts: 1 NO + 1 NC transverse switch included
• Rated Operational Voltage: Up to 690 V AC (AC-3/AC-3e duty)
• Short-Circuit Protection: Magnetic trip unit – response value 52 A, breaking capacity up to 100 kA at 400 V
• Mounting: DIN rail (35 mm) or screw mounting, with screw-type terminals

Technical Specifications

• Product Series: SIRIUS 3RV2 Motor Protection Circuit Breakers
• Number of Main Poles: 3 (three-phase switching)
• Adjustable Current Range: 2.8 … 4 A
• Operating Voltage (Main Circuit): 20 … 690 V AC; rated AC-3 up to 690 V
• Operating Power (AC-3): 0.8 kW at 230 V, 1.5 kW at 400 V, 3.0 kW at 690 V
• Short-Circuit Breaking Capacity (Icu): 100 kA at 400 V; 6 kA at 690 V
• Auxiliary Contacts: NO/NC: 1 NO + 1 NC
• Main Terminal Connection: Screw terminals for conductor cross-section up to 2x(2.5…10 mm²) solid/stranded
• Ambient Operating Temperature: -20 °C to +60 °C; Storage: -50 °C to +80 °C
• Mounting Dimensions: Height 97 mm × Width 45 mm × Depth 97 mm
• Protection Class: IP20 (front and terminals)
• Electrical Endurance: ~100 000 switching cycles
• Country of Origin: Germany

Compliance & Certifications

• CE Marking: Conforms to EU Low Voltage and Machinery Directives
• Standards: IEC/EN 60947 series for motor protection circuit breakers
• Trip Class: Class 10 per motor protection standards
• RoHS Compliant: Free from restricted hazardous substances since 10/01/2009
• Protection Class (front): IP20 – finger-safe design

Applications

Ideal for protecting small three-phase motors and feeders where compact design and high switching capacity are required. Commonly used in machine tools, packaging lines, pumps, fans and general industrial automation installations.