SIRIUS S3 contactor with 20-33 V AC/DC coil
The Siemens 3RT2346-1NB30 is a SIRIUS-branded contactor in the S3 frame size, designed for motor switching and general load control in industrial panels. The coil accepts 20-33 V AC/DC, making it a straight fit for 24 V control buses common in PLC cabinets. The inrush current peak of 6.5 A at coil pick-up means the 24 VDC supply must be sized to handle that transient without dropping below the 20 V dropout threshold.
Wire termination and panel space
Main circuit terminals accept stranded wire from 6 mm² up to 70 mm² — covers most motor feeds up to the S3 current range without needing lug adapters. Dimensions are 152 mm deep, 96 mm wide, 140 mm tall. The width is the critical panel fill number — at 96 mm it occupies about 5.4 module spaces on a standard DIN rail, so plan the gland plate and wireway clearance accordingly.
Coil performance and thermal limits
Coil operating range is 20-33 V AC/DC with a pickup threshold of 0.8× rated value and a dropout of 0.55× rated value — the 24 V nominal sits comfortably in the middle. The 60 °C ceiling is typical for enclosed panels without forced cooling — if the panel ambient exceeds that, derate or add ventilation. Arcing time is 10-20 ms; opening and closing times are 38-57 ms for both AC and DC coil types. These timing windows matter for coordination with upstream short-circuit protection devices.
Sourced to order against BOM quantities through independent distribution.