What it is and where it fits
The Siemens 3RT1015-2BB41-ZW98 is a SIRIUS power contactor in the compact size S00 frame, designed for switching motor loads in control panels. It mounts via screw or snap-on onto 35 mm standard mounting rail per DIN EN 50022, making it a direct fit for any standard DIN-rail enclosure. The magnet coil is rated for 24 V DC, drawing 3.3 W on closing and 3.3 W holding, so the control transformer or DC supply needs to deliver that continuously. The contactor is rated for AC-3 duty at 400 V at 3 kW, and AC-4 at 400 V at 6.5 A — the AC-3 figure is the one that governs motor switching in most conveyor, pump, and fan applications.
Key ratings and what they mean for your BOM
Rated operational current at 24 V is 10 A (AC-12), which covers resistive and lightly inductive loads. For motor duty at 400 V, the AC-3 rating is 3 kW — that's the number to match against your motor nameplate. The AC-4 rating of 6.5 A at 400 V applies for reversing or inching duty where the contactor makes and breaks stalled-rotor current. Main circuit connections use spring-loaded terminals accepting 2x (0.25... 2.5 mm²) solid or stranded, or 2x (24... 14 AWG). No screw torque to verify — just strip to 8 mm and push in. The auxiliary contact block is rated for 10 A at 24 V, 6 A at 230 V, and 0.3 A at 220 V DC, so check your control voltage before wiring the aux. Short-circuit coordination: with type 2 coordination, the required upstream fuse is gL/gG 20 A; for type 1 coordination, 35 A. That determines the fuse size in your feeder circuit — type 2 means the contactor remains usable after a fault, type 1 means it may need replacement.
Physical fit and environment
Dimensions: 45 mm wide, 60 mm high, 73 mm deep — fits the standard S00 footprint. Side-by-side mounting is permitted with 6 mm spacing to adjacent devices. Operating temperature range is -25 to +60 °C, with a maximum operating altitude of 2 000 m. Degree of pollution 3 means it's rated for industrial environments with conductive pollution. Protection rating is IP20 on the front and at the terminals — suitable for installation inside a closed control cabinet, not for washdown or outdoor exposure.