Capacitor Switching Contactor for Power Factor Correction Banks
The Siemens 3RT1627-1AN61 is a dedicated capacitor contactor from the SIRIUS family, rated AC-6 for switching capacitor banks. This means it handles the high inrush current and transient recovery voltage characteristic of capacitive loads — a standard power contactor would weld its contacts switching a capacitor bank of this size.
Depth is 135 mm, height 100 mm — allow clearance for the arc chamber and wiring. IP20 on the front (finger-safe), IP00 at the terminals — the connection points are live when powered, so the panel door or a terminal cover must provide the final touch protection.
Wiring and Auxiliary Contacts
Main circuit uses screw-type terminals for 3-pole NO contacts. One auxiliary NO contact (screw-type) is built in — enough to signal the contactor state to a PLC input or to seal in the coil circuit. No NC auxiliary contacts on this variant.
