Contactors switch high-current (10-800 A) motor circuits — paired with thermal overload or electronic protection to form a motor starter. Siemens SIRIUS 3RT, ABB AF (electronic coil), Schneider TeSys (D/F/Giga) and Eaton XT lead.
Contactor
Contactor
Contactors switch high-current (10–800 A) motor circuits — Siemens SIRIUS 3RT, ABB AF and Schneider TeSys with therma...
Contactors switch high-current (10–800 A) motor circuits — Siemens SIRIUS 3RT, ABB AF and Schneider TeSys with thermal overloads.
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FAQ
Q AC1/AC3/AC4 difference?
A
AC1: resistive (heating, transformer); AC3: motor starting + running (standard); AC4: jogging + plugging (frequent switching). Same type AC3 current > AC4.
Q ABB AF advantages?
A
Electronically controlled coil, 24-500 V AC/DC universal; pickup + holding power cut to 1/3; no suppressor; low EMC. 30-50% premium, simplifies spares.
Q Contactor + thermal vs MPCB?
A
Contactor + thermal: low cost, adjustable protection, separate components. MPCB (motor protection circuit breaker, Schneider GV3, Siemens 3RV): integrates short-circuit + overload + isolation — more compact in cabinet.