The Siemens SIRIUS 3RT1316-1BW40 is a size S00 power contactor carrying 4 NO main contacts and a 48 V DC coil. It is rated for 4 kW at AC-2 duty on 400 V, making it suited for switching motor loads like pumps and conveyors in control panels. The DC magnet holds at 3.3 W, with a pickup threshold of 0.85 x rated voltage and an overexcitation limit of 1.1 x rated voltage.
Mounting and integration
Snap-on mounting onto 35 mm DIN rail per DIN EN 50022, or screw-mount. The S00 footprint is compact at 45 mm wide, 57.5 mm tall, and 72 mm deep — leaves room on a crowded DIN rail for auxiliary blocks or overload relays. Side-by-side mounting is permitted with a 6 mm minimum gap to adjacent devices for heat dissipation. Screw-type terminals on the main circuit accept 2x (0.5 to 1.5 mm²) solid, 2x (0.75 to 2.5 mm²) stranded, or up to 2x (0.75 to 4 mm²) max. AWG equivalents: 2x (20 to 16), 2x (18 to 14), 1x 12. Finely stranded conductors require core-end processing. Front and terminal protection is IP20.
Ratings and coordination
The DC coil operates over a 48 V nominal with a pickup threshold of 0.85 (40.8 V) and can tolerate 1.1 x (52.8 V) for overexcitation. Switching capacity on the DC side: 10 A at 24 V, 2 A at 60 V, 1 A at 110 V, 0.3 A at 220 V, 6 A at 230 V, 3 A at 400 V. For AC-12 resistive loads, the maximum operating current is 10 A. Type 1 coordination requires a gL/gG fuse rated 35 A; Type 2 coordination requires 20 A. The contactor is rated for a pollution degree of 3 and an ambient temperature range of -25 to +60 °C during operation. Maximum altitude is 2 000 m. Mechanical endurance is typical 30 million switching cycles. The contactor carries a reference code Q per DIN EN 81346-2.