Capacitor Switching Contactor for Power Factor Correction
The Siemens SIRIUS 3RT2645-1AB03 is a dedicated capacitor contactor from the SIRIUS family, designed for switching capacitor banks in power factor correction (PFC) panels. It is rated for 6 A at 230 V AC and 3 A at 400 V AC, with a maximum switching frequency of 200 operations per hour at 230 V and 100 per hour at 400 V — meaning it handles repetitive capacitor inrush without excessive wear.
Solid conductors: accepts 2x (0.5…1.5 mm²), 2x (0.75…2.5 mm²), or 2x 4 mm². Stranded conductors: 2x (16…70 mm²) or 1x (16…70 mm²). At 40 °C, a single 70 mm² conductor is allowed; at 60 °C, two 50 mm² conductors. The screw terminals suit panel wiring with ferruled or solid wire. Dimensions: 80 mm wide, 140 mm high, 152 mm deep — the depth matters for enclosure depth clearance in retrofit panels.