Dual-rail mounting and panel fit
The 3RA2150-4JA37-0NB3: The starter mounts via screw and snap-on to two 35 mm DIN rails — the dual-rail footprint is the first thing to check in a retrofit panel where the existing backplate has only a single DIN rail or the gland plate clearance is tight. At 150 mm deep, 55 mm wide and 274 mm tall, it occupies the full S2 frame envelope; the 50 mm upward clearance and 32 mm forward clearance are the minimum free air space around the enclosure for cable entry and heat dissipation. Mounting position is vertical or horizontal, so the starter fits in a shallow enclosure laid on its side as long as the ambient stays within -20 to +60 °C during operation.
Motor switching capacity and overload protection
The supplied contactor is 3RT2037-1NB30 and the link module is 3RA2931-1AA00 — if either component fails in the field, these are the order codes for the replacement parts, not the whole starter assembly.
Sourcing and compliance
The substance prohibitance date of 03/01/2017 confirms RoHS compliance per the EU directive; the operating temperature range of -20 to +60 °C and storage range of -50 to +80 °C cover most industrial enclosure environments.