Siemens Circuit breaker for motor protection, size S0, 34...40 A Part number 3RV2021-4FA10

Product Overview

The Siemens 3RV2021-4FA10 is a SIRIUS 3RV2 motor protection circuit breaker, circuit breaker size S0 for motor protection, CLASS 10 with A-release 34...40 A and N-release 480 A, screw terminal, standard switching capacity. It provides thermal overload and magnetic short-circuit protection for three-phase motors within the 34–40 A range, combining protection and switching in a compact device suitable for use in motor starters and load feeders.

Key Features

• Circuit breaker size S0 for motor protection (SIRIUS 3RV2 series)
• Tripping class 10 for standard motor-start applications
• Thermal overload release (A-release) adjustable from 34...40 A
• Magnetic short-circuit release (N-release) fixed at 480 A
• Standard switching capacity for industrial motor circuits
• 3-pole design for three-phase motor protection
• Screw terminals for secure, robust wiring
• Compact, current-limiting design for load feeders
• Finger-safe IP20 on front and terminals with connected conductors
• High mechanical and electrical endurance (typically 100 000 switching cycles)

Technical Specifications

• Article Number: 3RV2021-4FA10
• Product Type: Motor protection circuit breaker
• Product Family: SIRIUS 3RV2
• Circuit Breaker Size: S0
• Number of Poles (Main Circuit): 3
• Tripping Class: CLASS 10
• Overload Release (A-release): 34...40 A adjustable
• Short-circuit Release (N-release): 480 A
• Rated Operating Voltage: up to 690 V AC
• Rated Insulation Voltage Ui: 690 V
• Rated Surge Voltage Withstand: 6 kV
• Power Loss (typical): approx. 14 W total
• Protection Class: IP20 (front and terminals)
• Mechanical Service Life: ~100 000 switching cycles (main and auxiliary contacts)
• Electrical Endurance: ~100 000 switching cycles
• Ambient Operating Temperature: –20 °C to +40 °C
• Storage / Transport Temperature: –50 °C to +80 °C
• Temperature Compensation: –20 °C to +60 °C
• Relative Humidity (operation): 10 % to 95 %
• Maximum Installation Altitude: 2000 m above sea level
• Terminals: Screw terminals for main connections

Compliance & Standards

• Part of the Siemens SIRIUS motor protection and load feeder system
• Design for increased safety and finger-safe operation (IP20)
• Meets Siemens specifications for motor protection circuit breakers with CLASS 10 tripping characteristics

Applications

The 3RV2021-4FA10 is used for protecting and switching three-phase motors in industrial control panels, motor control centers and machine feeders. Typical applications include pumps, fans, compressors, conveyors and other machinery where motor currents fall within the 34...40 A range, and reliable overload and short-circuit protection with integrated switching is required.