55 kW at 400 V — star-delta contactor assembly, S3 frame
The 3RA2444-8XF32-1AC2: It ships with three contactors: two 3RT2045-1AC20 units for the line and delta legs, and one 3RT2035-1AC20 for the star leg, plus the RS assembly kit 3RA2943-2C. The S3 frame size means the contactor footprint matches the panel cutout for this class. The assembly mounts on 35 mm DIN rail via screw and snap-on fastening, with ±180° rotation possible on a vertical surface and ±22.5° tilt forward/backward — useful when fitting into tight enclosures where the gland plate location forces an off-axis orientation.
Mechanical life and operating cycle limits
Rated for 10,000,000 mechanical operating cycles typical, with a maximum AC-3 switching frequency of 1,000 operations per hour. The 10 million cycle figure means this assembly outlasts most motor-driven loads in continuous process duty before contact wear becomes a factor. Vibration resistance is specified at 10.6 g / 5 ms and 6.3 g / 10 ms, which covers most industrial panel environments without additional damping.
Termination and wiring — screw terminals throughout
Main current circuit, auxiliary/control circuit, and magnet coil all use screw-type terminals — no spring-cage or push-in on this assembly. Fuse sizing for type 2 coordination requires gG NH 3NA, DIAZED 5SB, or NEOZED 5SE at 160 A. No auxiliary switch or bus communication module is fitted as standard — the product extension for auxiliary switch is listed as 'No' and bus communication as 'No'.
Dimensions and panel clearance
The assembly measures 180 mm high, 220 mm wide, and 244 mm deep.