Siemens Sirius MCU Reversing motor starter, 0.55kW Part number 3RK4340-3ER51-1BA0

Product Overview

The Siemens 3RK4340-3ER51-1BA0 is a SIRIUS MCU motor starter combination designed for forward/reverse (reversing) motor operation. It integrates motor protection and short-circuit protection in a compact plastic enclosure with IP55 protection. The unit is suitable for motors up to approximately 0.55 kW at 400 V and includes adjustable thermal overload protection.

Key Features

• Reversing motor starter (forward and reverse operation)
• Integrated overload and short-circuit protection
• Thermal overload release adjustable from approx. 1.1 A to 1.6 A
• Rated operational current approx. 1.6 A (AC-3, 400 V)
• Suitable for motors up to approx. 0.55 kW at 400 V
• IP55 plastic enclosure for industrial environments
• Manual operation with screw-type terminals for wiring
• Compact solution combining protection and control in one device

Technical Specifications

• Article Number: 3RK4340-3ER51-1BA0
• Product Family: SIRIUS MCU motor starter combination
• Starter Type: Reversing (forward/reverse)
• Rated Operational Current: approx. 1.6 A (AC-3, 400 V)
• Rated Motor Power: approx. 0.55 kW at 400 V
• Thermal Overload Setting Range: 1.1…1.6 A
• Control Supply Voltage: 24 V DC (typical range 20.4…26.4 V)
• Short-Circuit Breaking Capacity: up to approx. 50 kA at 400 V
• Protection Rating: IP55
• Enclosure Material: Plastic
• Dimensions (W × H × D): approx. 182 mm × 220 mm × 145 mm

Compliance & Certifications

• Designed and tested under Siemens SIRIUS quality standards
• Complies with IEC/EN standards for motor starters and protection devices
• Suitable for industrial use with IP55 environmental protection

Applications

Used for reversing control of three-phase motors in machinery, conveyors, pumps, workshop systems, and general industrial equipment. Its integrated protection and robust enclosure make it suitable for moderately harsh environments where compact motor control solutions are required.