Mitsubishi S-T21 AC Magnetic Contactor, 3Pole 25A 11kW 2NO2NC Multi Optional Coil Voltage

Mitsubishi S-T21 AC Contactor

Mitsubishi S-T21 is a mid-range high-stability AC magnetic contactor in the upgraded S-T series.

This S-T21 unit delivers reliable switching for medium-power industrial three-phase motor loads.

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-T21 equips full 2NO2NC auxiliary contacts for complex control logic needs.

This magnetic contactor supports three universal AC voltages for global site adaptation.

Optimized arc suppression design enhances safety during frequent load switching cycles.

Reinforced internal structure improves stability under continuous industrial operation.

Standard compact frame balances performance and cabinet space utilization efficiency.

Core Technical Specifications

Electrical Performance Parameters

Operation type: AC coil operated non-reversing industrial contactor

Rated AC-3 operational current: 25A 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: 2NO + 2NC multi-functional signal control contacts

AC-3 power rating: 5.5kW(240V), 11kW(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: 63mm width, 81mm height, 81mm depth

Unit weight: 0.41kg 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 pumps and blower fan motor systems.

It handles stable power switching for standard packaging and material handling machinery.

The industrial contactor adapts to versatile automation panel component layouts.

It serves reliable circuit control for mid-sized factory automation equipment sets.

Professional Installation & Usage Tips

Mount Mitsubishi S-T21 steadily on DIN rails for standardized industrial assembly.

Choose the correct AC coil voltage to prevent coil heat damage and circuit faults.

Install surge suppressors to filter transient voltage spikes in control circuits.

Inspect terminal tightness regularly to maintain stable long-term circuit connection.