ABB MO 325-20 Manual Motor Starter

1. Product Overview

The ABB MO325‑20 Magnetic Manual Motor Starter is a manual motor starter designed to provide on/off control and reliable protection for both three-phase and single-phase motors. It incorporates magnetic (short-circuit) protection without requiring fuses, manual switching capability, and overload protection functions. The device features a three-pole configuration with a rotary handle and clear ON/OFF indication for easy operation and status visualization.alldataresource.com

2. Technical Specifications

• Model: MO325-20

• Product Type: Manual Motor Starter

• Series: MO325

• Rated Operational Current (Ie): 20 A

• Poles: 3

• Rated Operating Voltage: 690 V AC / 440 V DC

• Service Short-Circuit Breaking Capacity (Ics): 55 kA at 400 V AC

• Rated Instantaneous Short-Circuit Setting (Ii): 300 A

• Rated Insulation Voltage (Ui): 690 V

• Rated Impulse Withstand Voltage (Uimp): 6 kV

• Frequency Rating: 50/60 Hz

• Protection Class: IP20

• Terminal Type: Screw terminals

• Electrical Durability: 50,000 cycles

• Mechanical Durability: 100,000 cycles

• Mounting: Panel or DIN rail compatible

• Operation: Rotary ON/OFF handle

• Ambient Temperature Range: -25 °C to +50 °C

• Dimensions: 54 mm (W) × 87.5 mm (H) × 75.5 mm (D)

• Rated Motor Power Example (AC-3): approx. 9 kW at 400 V (typical) alldataresource.com+1

3. Advantages and Features

• Integrated manual control and protection for simple and reliable operation.

• Fuse-free short-circuit protection using built-in magnetic trip mechanism.

• Robust mechanical and electrical durability for long service life.

• Clear ON/OFF position indication improves operator visibility and safety.

• Wide voltage and frequency compatibility for versatile applications.

4. Typical Applications

• Motor start and protection in industrial control panels

• Drives for conveyors, pumps, and fans

• Machine tools and automated production equipment

• Manual motor control stations

• General industrial and commercial motor circuits

5. Installation and Usage Notes

• Verify that the starter rating matches the system voltage and current requirements.

• Ensure all terminal connections are properly tightened and labeled.

• Install in a well-ventilated, clean environment free from corrosive fumes.

• Follow correct start/stop sequence to prevent misoperation.

• Perform routine inspections of mechanical condition and electrical connections.

• For systems with high electrical noise or surges, consider additional suppression measures.

The structure and details of the product： ​

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