What the assembly contains and how it mounts
The 3RA2446-8XF32-1NB3: This is a factory-assembled star-delta starter built around two 3RT2046-1NB30 contactors and one 3RT2037-1NB30, plus a 3RA2943-2C RS assembly kit with a varistor surge suppressor across the coil. Dimensions are 180 mm high, 220 mm wide, and 244 mm deep — the depth is the dimension to watch when the panel door clearance is tight.
Motor power and duty ratings
Rated 90 kW at 400 V and 132 kW at 690 V in AC-3 duty — this is the motor-switching current the assembly handles under full-load starts, not just resistive heating. Maximum operating voltage is 690 V AC-3, and the coil control range is 20–33 V DC with a closing power draw of 154 W. The assembly is designed for a maximum of 850 switching operations per hour under AC-3 conditions, with a mechanical life of 10 million operations typical for the contactor size S3.
Environmental limits and fuse coordination
Operates from -25 to +60 °C and stores from -55 to +80 °C — the upper operating limit matters if the panel sits near a heat source or in a non-ventilated enclosure. For type 2 coordination the required upstream fuse is 160 A gG (NH 3NA, DIAZED 5SB, or NEOZED 5SE) — this is the fuse rating that clears a fault without damaging the starter. Vibration resistance is specified at 10.6 g / 5 ms and 6.3 g / 10 ms under AC conditions — relevant for installations on machinery or conveyors with periodic shock loads.
Substance compliance date (RoHS/REACH) is noted as 03/01/2017 — the assembly meets the EU substance restrictions in effect from that date.