The Siemens 3RT1317-1BB40 is a SIRIUS power contactor in frame size S00, built for switching motor loads in control panels. It carries a 24 VDC coil and four normally-open main contacts, rated for 5.5 kW at AC-2 duty on a 400 V line — that's the motor power it handles under moderate starting currents, typical for slip-ring or wound-rotor motors.
Mounting and panel fit
Snaps onto a 35 mm DIN rail per EN 50022, or screws directly to a backplate. The 45 mm width and 57.5 mm height keep it compact for a 4-pole contactor; depth is 72 mm, which matters when you're planning gland-plate clearance or door swing in a shallow enclosure. Side-by-side mounting is allowed with no derating gap. Terminals are screw-type on both main and auxiliary circuits. Wire range on the mains accepts 2x (0.5...1.5 mm²), 2x (0.75...2.5 mm²), or up to 2x (0.75...4 mm²) — fine-stranded with ferruled ends included. AWG equivalents are 2x (20...16), 2x (18...14), and 1x 12. The front and terminal faces carry IP20 protection, so it's safe for finger-probe access inside a locked panel but not for washdown environments.
Coil and switching specs
The DC coil pulls 3.3 W on pickup and holds at the same 3.3 W — no power drop after sealing, so budget for continuous dissipation. Pickup voltage threshold is 0.85 x rated (20.4 VDC), dropout below that. Rated switching capacity across the auxiliary contacts: 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, and 3 A at 400 V — all DC values. For the main circuit at AC-2, 400 V, it handles 5.5 kW. Operating temperature range is -25 to +60 °C, with a pollution degree of 3 (conductive or dry non-conductive pollution). Mechanical life is typical 30 million operations. For type 2 coordination, the required upstream fuse is gL/gG 20 A; for type 1, 35 A.