Siemens SIRIUS MCU DOL motor starter, 0.55kW

Product Overview

The Siemens 3RK4340-3ER51-0BA0 is a SIRIUS MCU motor starter combination designed for direct-on-line (DOL) motor starting with integrated motor protection and reversing capability. Housed in a compact plastic enclosure rated to IP55, this device offers a robust solution for three-phase motor control in industrial settings.

Key Features

• Reversing motor starter (forward/reverse functionality)
• Integrated short-circuit protection via circuit-breaker type main circuit device
• Thermal overload release adjustable from approx. 1.1 A to 1.6 A
• Rated motor current approx. 1.6 A (AC-3 at 400 V) and motor power approx. 0.55 kW at 400 V
• Plastic enclosure rated to IP55 protection for use in industrial environments
• Screw-type main circuit connections for secure and durable wiring
• Compact design combining starter and protection in one unit for space-efficient installation

Technical Specifications

• Article Number: 3RK4340-3ER51-0BA0
• Product Series: SIRIUS MCU motor starter combination
• Rated Operational Current (Ie): approx. 1.6 A at 400 V (AC-3)
• Rated Motor Power: approx. 0.55 kW at 400 V
• Thermal Overload Setting Range: 1.1 … 1.6 A
• Short-Circuit Breaking Capacity (Icu): up to 50 000 A at 400 V
• Main Circuit Poles: 3
• Control Supply Voltage (DC): 20.4 … 26.4 V DC
• Protection Rating: IP55
• Dimensions (W×H×D): approx. 182 mm × 220 mm × 145 mm
• Operating Ambient Temperature: –25 °C to +35 °C

Compliance & Certifications

• Manufactured under Siemens SIRIUS MCU product standard and quality guidelines
• Designed to meet relevant IEC/EN standards for motor starters and motor protection (e.g., IEC 60947 series)
• IP55-rated housing for protection against dust and low pressure water jets — suitable for industrial control cabinets and motor starter applications

Applications

The 3RK4340-3ER51-0BA0 is well suited for industrial three-phase motor control applications where reversing operation is required such as conveyors, belt drives, pumps, machine tools and other equipment. Its integrated protection and compact enclosure make it ideal for motor control cabinets and machine-mounted installations in moderately harsh industrial environments.