Star-delta contactor assembly, 55 kW at 400 V
The Siemens 3RA2437-8XF32-1NB3 is a factory-assembled star-delta (wye-delta) starter from the SIRIUS family, built around three contactors: two 3RT2037-1NB30 units for the line and star legs, and one 3RT2035-1NB30 for the delta leg. The kit ships complete with the RS assembly kit 3RA2933-2BB1 and a varistor surge suppressor across the coil — no separate surge suppressor to order.
What ships in the carton
The assembly includes three screw-type contactors (two 3RT2037-1NB30, one 3RT2035-1NB30), the RS assembly kit, and a varistor surge suppressor — all mounted on a common baseplate with screw fixing. No auxiliary switch or bus communication module is included — the product extension for auxiliary switch and bus communication are both listed as 'No'.
Mounting and panel fit
The assembly measures 177.5 mm wide by 142 mm tall by 223 mm deep, with screw fixing to the mounting surface.
Duty ratings and coordination
For Type 2 coordination, the required upstream fuses are gG NH 3NA, DIAZED 5SB, or NEOZED 5SE rated 125 A.