The Siemens 3RT1627-1AP61 is a capacitor contactor from the SIRIUS 3RT2 series, rated for AC-6 duty at 25 kVAr / 400 V — that means it is designed specifically for switching capacitor banks in power factor correction (PFC) panels, where inrush currents from discharged capacitors can exceed the steady-state rating. The 35 A rated value and 3 NO main contacts handle the switching, while the single NO auxiliary contact provides feedback or interlock. The coil is 220 V AC at 50 Hz and 240 V AC at 60 Hz, drawing from a 50/60 Hz control supply.
The 3RT1627-1AP61 is a phased-out product. The preferred successor is the SIRIUS 3RT2627-1AP65, which should be verified for electrical and mechanical interchangeability before specifying into a new design.
Integration Notes
Mounts on a 35 mm DIN rail per DIN EN 50022 with a 45 mm width, 100 mm height, and 135 mm depth. The IP20 front and IP00 terminal area mean the panel door must provide the environmental seal; the contactor itself is touch-safe on the front but the terminals are exposed. Side-by-side mounting is allowed — no derating required for adjacent units.