The Siemens 3RT2636-1AV05 is a capacitor contactor — a three-pole switching device purpose-built for switching power-factor correction capacitor banks. The coil is 400 V AC, 50 Hz, and the contactor carries 2 NC auxiliary contacts wired via screw terminals. The S2 frame size is a standard Siemens footprint that mates with the usual DIN-rail mount and busbar system in a panel. If you're swapping one into an existing capacitor bank cabinet, the mechanical interlock and auxiliary wiring pattern are the same as other S2 contactors in this family.
Siemens 3RT2636-1AV05 Capacitor Contactor, AC-6b 50 kVAr, 40
MPN3RT2636-1AV05
Siemens 3RT2636-1AV05, capacitor contactor, AC-6b 50 kVAr, / 400 V, 3-pole, 400 V AC, 50 Hz, auxiliary contacts: 2 NC, screw terminal, size: S2.
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Product details
Frequently asked questions
What is the AC-6b 50 kVAr rating for?
That rating is specific to switching power-factor correction capacitor banks. The AC-6b duty class accounts for the high inrush current and oscillatory transient that capacitors draw when first energised. A standard motor-rated contactor would see contact welding under that load; this contactor is designed to handle it.
What auxiliary contacts does it have?
It comes with 2 NC (normally closed) auxiliary contacts, terminated with screw terminals. That is the factory configuration — no additional aux blocks are included on this variant.
MPN
3RT2636-1AV05