The Mitsubishi Electric S-T is a 3-pole power contactor rated 9–105 A in AC-3 (motors of about 4–55 kW at 400 V) with a 220 V AC coil. It switches three-phase motors, heaters, lighting groups and capacitor steps remotely from push buttons, PLCs, float switches, pressure switches or timers, and combines with a thermal overload relay or MPCB to form a complete motor starter. This listing covers several ratings – choose the version that matches the motor current.
Key features
- 9–105 A AC-3 rating for motors of 4–55 kW
- Coil 220 V AC
- Long electrical and mechanical life for frequent switching
- Add-on auxiliary contacts, timers, surge suppressors and mechanical interlocks
- Direct mounting of matching thermal overload relays
- DIN-rail or screw mounting (frame dependent)
Technical specifications
| Brand |
Mitsubishi Electric |
| Part number / model |
S-T |
| Device type |
Power contactor (3-pole) |
| Rated operational current AC-3 |
9–105 A |
| Motor power AC-3 at 400 V |
4–55 kW |
| Coil voltage |
220 V AC |
| Poles |
3 NO main poles |
| Standard |
IEC/EN 60947-4-1 |
Available versions
Rating: 9A / 4kW (S-T10), 12A / 5.5kW (S-T12), 18A / 7.5kW (S-T20), 23A / 11kW (S-T21), 30A / 15kW (S-T25), 32A / 15kW (S-T32), 40A / 18.5kW (S-T35), 50A / 22kW (S-T50), 65A / 30kW (S-T65), 85A / 45kW (S-T80), 105A / 55kW (S-T100).
Typical applications
- Water pumps, booster and sewage pumps
- DOL, star-delta and reversing starters
- HVAC compressors, fans and cooling towers
- Heater and lighting control
- Capacitor banks, cranes and conveyors
Selection and installation tips
Select the contactor by the motor full-load current in AC-3 rather than kW alone, choose the coil voltage to match the control circuit (220–230 V AC is the most common in Egypt), and add a thermal overload relay whose setting range covers the motor current.
Frequently asked questions
What motor size can the Mitsubishi S-T control?
It is rated 9–105 A in AC-3 duty at 400 V, which corresponds to three-phase motors of about 4–55 kW.
What is AC-3?
AC-3 is the IEC utilisation category for starting and stopping squirrel-cage motors – the standard rating used to select motor contactors.
Do I need an overload relay with the contactor?
Yes. A contactor only switches the motor; protection against overload must be provided by a thermal overload relay or a motor protection circuit breaker.
Buy Mitsubishi S-T in Egypt
Spark Egypt supplies the original Mitsubishi Electric S-T magnetic contactor with a VAT tax invoice for electrical contractors, panel builders, factories, consultants, retailers and maintenance teams. Delivery is available to Cairo, Giza, New Cairo, 6th of October, Sheikh Zayed, the New Administrative Capital, Alexandria, the Delta, the Canal cities and Upper Egypt. Our technical team can confirm ratings, compatible accessories and equivalent references before you order, and project quantities are quoted on request.
