Siemens Circuit breaker size S0 for motor protection, spring, 3.2A Part number 3RV2021-1DA20

Product Overview

The Siemens 3RV2021-1DA20 is a motor-protection circuit breaker from the SIRIUS 3RV2 series, size S0. It is designed for three-phase motor protection, with an adjustable overload current range of 2.2…3.2 A, short-circuit protection (N release) up to 42 A, and a class 10 thermal trip characteristic. The breaker features spring-type terminals and is suitable for DIN-rail mounting in industrial distributions.

Key Features

• Motor-protection circuit breaker (size S0) in the SIRIUS 3RV2 series
• Adjustable overload current setting: 2.2…3.2 A
• Short-circuit (magnetic) release: 42 A
• Trip class: 10 A release characteristic
• Standard switching capacity: up to 100 kA breaking capacity (400 V AC)
• Spring-type terminals for main current circuit
• DIN-rail or screw-type mounting according to 35 mm rail standard

Technical Specifications

• Article Number: 3RV2021-1DA20
• Number of Poles: 3 (three-phase)
• Rated Operational Current (AC-3, 400 V): 3.2 A
• Rated Service Power (AC-3): 1.1 kW at 400 V; 1.5 kW at 500 V; 2.2 kW at 690 V
• Rated Insulation Voltage (Ui): 800 V
• Breaking Capacity (Icu): 100 kA at 400 V AC
• Mounting Width: 45 mm
• Height × Depth: Approximately 119 mm × 97 mm
• Ambient Operating Temperature: -20 °C … +60 °C
• Wire Connection (Main Circuit): Top/bottom, spring-type terminals, solid up to 10 mm², stranded up to 6 mm²

Compliance & Certifications

• Complies with IEC/EN 60947-4-1 and IEC/EN 60947-2 standards for motor-protection circuit breakers
• Rated for industrial motor protection, branch-circuit protection and system integration

Applications

The 3RV2021-1DA20 is ideal for use in industrial control panels, motor feeder protection, machine tool controllers, and automation switchgear where three-phase motors are employed. It is particularly suited for applications requiring a compact protective device, adjustable overload setting, and high breaking capacity.