Key Specifications
Electrical Ratings
Rated Current: 20 A
Adjustment/Setting Range: 16–20 A
Rated Operational Voltage: up to 690 V AC / 440 V DC
Rated Operational Power (AC‑3, 400 V, 3‑phase): ~7.5 kW
Full Load Current (Motor): ~27 A
Rated Service Short‑Circuit Breaking Capacity (Ics): ~55 kA at 400 V AC
Trip Class: 10
Poles: 3 poles
Protection & Mechanisms
Overload Protection: Adjustable thermal
Short‑Circuit Protection: Magnetic
Phase Loss Sensitivity: Included
Trip‑Free Mechanism: Yes
Disconnect Function: Yes
Handle Indication: Clear ON/OFF
Mechanical / Installation
Operation Type: Manual (rotary handle)
Terminal Type: Screw/thread connection
Mounting: DIN‑rail or panel
Enclosure Rating: IP20
Operating Temperature: –25 °C to +50 °C
Dimensions: ~87.5 mm (H) × 54 mm (W) × 75.5 mm (D)
Operating Cycles: ~100,000
Standards & Compliance
IEC/EN 60947‑1, 60947‑2, 60947‑4‑1
UL508, CSA 22.2 No. 14
RoHS compliant
The ABB MS325‑20 is a manual motor starter designed for reliable motor control and protection in industrial and commercial electrical systems. It allows operators to manually start and stop motors while providing built‑in overload and short‑circuit protection without the need for separate fuses. It features a rotary handle with clear ON/OFF indication and a built‑in disconnect function. The device is suitable for three‑phase applications and supports phase loss sensitivity for enhanced motor safety.