Siemens Circuit breaker for motor protection, screw, size S0, 52A Part number 3RV2021-1EA10

Product Overview

The Siemens 3RV2021-1EA10 is a SIRIUS 3RV2 motor protection circuit breaker designed to protect three-phase motors against overloads, short circuits, and phase failure. It features a manual rotary ON/OFF operating mechanism and a thermal-magnetic trip unit with a Class 10 overload characteristic. With an adjustable current setting range of 2.8 A to 4 A, this device provides precise and reliable protection for small motor applications in industrial control and automation systems.

Key Features

• SIRIUS 3RV2 motor protection circuit breaker
• Thermal-magnetic trip unit with Class 10 overload characteristic
• Adjustable overload current range from 2.8 A to 4 A
• 3-pole design for full three-phase motor protection
• Manual rotary ON/OFF operating mechanism
• Phase-failure sensitive thermal release
• Screw terminals for secure conductor connection
• Expandable with auxiliary contacts and accessories

Technical Specifications

• Article Number: 3RV2021-1EA10
• Product Family: SIRIUS 3RV2 Motor Protection Circuit Breakers
• Frame Size: S0
• Number of Poles: 3
• Adjustable Current Range: 2.8 A – 4 A
• Trip Class: Class 10
• Rated Insulation Voltage: 690 V
• Rated Operational Voltage: up to 690 V AC
• Rated Frequency: 50/60 Hz
• Surge Withstand Voltage: 6 kV
• Connection Type: Screw terminals
• Mounting: DIN rail or panel mounting
• Phase Loss Sensitivity: Yes

Compliance & Standards

• Designed in accordance with IEC and EN standards for low-voltage protective devices
• Meets Siemens requirements for motor protection and switching devices
• Suitable for industrial and commercial motor control applications

Applications

The Siemens 3RV2021-1EA10 motor protection circuit breaker is used for the protection and manual switching of three-phase motors such as pumps, fans, compressors, and conveyors. It is commonly installed in motor control centers, automation panels, and industrial distribution boards where reliable overload and short-circuit protection combined with compact size and screw connection technology is required.