Mitsubishi S-T20 AC Magnetic Contactor, 3Pole 18A 7.5kW 1NO1NC Multi Optional Coil Voltage

Mitsubishi S-T20 AC Contactor

Mitsubishi S-T20 is a compact high-performance AC magnetic contactor in the upgraded S-T series lineup.

This S-T20 model delivers stable power switching for medium-duty industrial three-phase motors.

Available Optional Coil Voltages (Front Display)

AC100V (100–127V wide range for low-voltage industrial AC control circuits)

AC200V (200–240V wide range for mainstream global industrial AC systems)

AC400V (380–440V wide range for high-voltage three-phase power equipment)

Unique Product Strengths

Mitsubishi S-T20 features a compact body design that saves valuable cabinet installation space.

This magnetic contactor supports three universal AC coil voltages for flexible global site matching.

Standard 1NO1NC auxiliary contacts fulfill basic interlock and signal feedback circuit needs.

Optimized internal arc suppression structure improves safety during frequent switching cycles.

Durable mechanical structure extends service life and reduces routine maintenance workload.

Core Technical Specifications

Electrical Performance Parameters

Operation type: AC coil operated non-reversing industrial contactor

Rated AC-3 operational current: 18A at 200V three-phase industrial operation

Universal rated current: 9A at maximum 690V AC industrial working voltage

Main pole configuration: 3-pole standard industrial main circuit structure

Auxiliary contact layout: 1NO + 1NC built-in signal control contacts

AC-3 power rating: 4.5kW(240V), 7.5kW(440V), 7.5kW(690V)

Operating frequency: 50Hz and 60Hz dual universal frequency compatibility

Mechanical service life: 10,000,000 no-load switching operation cycles

Electrical service life: 100,000 standard AC3 load switching cycles

Mechanical & Structural Data

Mounting method: Standard 35mm DIN rail and screw fixed dual installation

Operating temperature range: -10°C to +40°C standard ambient environment

Wiring mode: Stable screw-clamp terminal connection industrial design

Protection grade: IP20 finger-safe and dust-proof safety protection structure

Product dimensions: 43mm width, 75mm height, 78mm depth

Unit weight: 0.27kg per standalone contactor unit

Compliance standards: EN60947-4-1, IEC60947-4-1, JIS C8201-4-1

Industrial Application Coverage

This magnetic contactor controls medium-power fan and pump motors in automation systems.

It provides reliable power switching for standard packaging and processing machinery units.

The industrial contactor fits compact automation panel component layouts perfectly.

It supports stable circuit control for medium-scale factory automation equipment.

Professional Installation & Usage Tips

Mount Mitsubishi S-T20 firmly on DIN rails for fast and standardized field assembly.

Select matched AC coil voltage to avoid coil overheating and unexpected operational faults.

Install surge suppressors to shield control circuits from industrial voltage spikes.

Check terminal connection tightness regularly to ensure long-term stable circuit operation.