Siemens 3RT10 Power S12 Contactor 3P 400–500 A AC-3 200–250 kW 220 V AC/DC Coil | Magnetic Motor Contactor

The Siemens 3RT10 Power S12 is a 3-pole power contactor rated 400–500 A in AC-3 (motors of about 200–250 kW at 400 V) with a 220 V AC/DC 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

• 400–500 A AC-3 rating for motors of 200–250 kW
• DC-operated coil for battery/UPS control circuits
• 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

Available versions

Current Rating: 400A / 200 kW, 500A / 250 kW.

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 Siemens 3RT10 Power S12 control?

It is rated 400–500 A in AC-3 duty at 400 V, which corresponds to three-phase motors of about 200–250 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 Siemens 3RT10 Power S12 in Egypt

Order the Siemens 3RT10 Power S12 magnetic contactor from Spark Egypt and receive a genuine product with an official tax invoice. We deliver to Cairo, Giza, New Cairo, 6th of October, Sheikh Zayed, the New Administrative Capital, Alexandria, the Delta, the Canal cities and Upper Egypt, and our engineers help contractors, installers and maintenance teams check ratings, accessories and cross-references before purchase. Request a quotation for bulk or project quantities.