ABB MS451-40 Manual Motor Protector

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1. Product Overview

The ABB MS451-40 is a Manual Motor Protector (MMP) designed for low-voltage motors and industrial equipment. It combines circuit breaker and thermal-magnetic overload protection functions to effectively prevent motor overload, short circuit, and phase imbalance, ensuring safe operation of motors and equipment. The MS451-40 is easy to operate manually, suitable for industrial sites requiring manual motor control and protection.

2. Detailed Technical Specifications

• Model: MS451-40

• Type: Manual Motor Protector

• Rated Current Range: 10–40 A

• Poles: 3 poles

• Rated Insulation Voltage: AC 690 V

• Short-Circuit Breaking Capacity: 10 kA

• Operation Mode: Manual toggle switch with locking mechanism

• Overload Protection: Thermal overload

• Short-Circuit Protection: Magnetic trip

• Mechanical Life: ≥ 10,000 operations

• Mounting: Panel or DIN rail

• Operating Temperature: –25 ℃ to +60 ℃

• Protection Class: IP20

• Standards & Certification: IEC 60947-4-1, CE

3. Advantages & Features

• Comprehensive protection: Overload, short-circuit, and phase imbalance protection

• Easy operation: Manual toggle switch with lock to prevent accidental operation

• High reliability: Industrial-grade design with long mechanical life

• High breaking capacity: Can withstand 10 kA short-circuit current

• Flexible installation: Panel or DIN rail mounting suitable for various industrial environments

• Low maintenance: Simple structure, easy to inspect and maintain

4. Typical Application Areas

• Low-voltage motor control systems

• Industrial automation equipment

• Conveyors, pumps, and fans

• Compressors and cooling systems

• Elevators and hoist control

• Building and energy distribution systems

5. Precautions & Installation Notes

• Verify rated current, poles, and voltage compatibility before installation

• Ensure the circuit is de-energized before operation; avoid switching under load

• Avoid high temperature, humidity, or strong interference

• Regularly check mechanical operation and contact condition

• Use the locking mechanism to prevent accidental operation

• Do not exceed rated load to extend service life

The structure and details of the product：

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