Siemens Circuit breaker for motor protection, size S2, 32-40A Part number 3RV2031-4UB10

Product Overview

The Siemens 3RV2031-4UB10 is a SIRIUS 3RV2 motor protection circuit breaker, size S2, designed to protect three-phase motors from overload and short-circuit faults. It features an adjustable overload release range of 32 to 40 A and a fixed instantaneous short-circuit release of 585 A. With a rated operational current of 40 A (AC-3 at 400 V) and motor power capacity up to 37 kW at 690 V, it provides reliable motor control and protection in industrial environments.

Key Features

• Motor protection circuit breaker from the Siemens SIRIUS 3RV2 series
• Size S2 device with rated current up to 40 A (AC-3, 400 V)
• Adjustable overload release range: 32 – 40 A
• Fixed instantaneous short-circuit release: 585 A
• High switching capacity suitable for demanding industrial motor applications
• Compact design for DIN rail or panel mounting
• 3-pole configuration for three-phase motor protection
• Screw-type terminal connections for secure and durable wiring

Technical Specifications

• Product Series: SIRIUS 3RV2
• Article Number: 3RV2031-4UB10
• Size: S2
• Rated Operational Current (AC-3, 400 V): 40 A
• Adjustable Overload Release (Ir): 32 – 40 A
• Instantaneous Short-Circuit Release: 585 A
• Rated Motor Power (AC-3): 11 kW at 230 V, 18.5 kW at 400 V, 37 kW at 690 V
• Rated Insulation Voltage (Ui): 690 V
• Surge Voltage Resistance: 6 kV
• Protection Class (Front): IP20
• Ambient Operating Temperature: –20 °C to +60 °C
• Dimensions (H × W × D): 140 mm × 55 mm × 149 mm
• Mounting Type: DIN rail or panel mounting

Compliance & Certifications

• Manufactured under Siemens SIRIUS industrial standards for motor protection
• Complies with IEC/EN 60947 for low-voltage switchgear and controlgear
• Tested for high breaking capacity and long operational life

Applications

Ideal for use in industrial automation and control systems requiring dependable motor protection. Commonly used in motor control centres, machinery, pumps, compressors, and conveyor systems, where reliable overload and short-circuit protection ensures safe operation and minimal downtime.