SIRIUS size S00 power contactor with 24 V DC coil
The Siemens 3RT1015-1HB42-ZX95 is a SIRIUS power contactor in frame size S00, designed for switching motor loads and resistive circuits in industrial control panels. The 24 V DC coil draws 2.3 W for both closing and holding, so the coil suppression circuit sees a steady-state load — no inrush spike to size your DC supply around. Screw-type terminals on the main circuit accept up to 2x 4 mm² per pole, which covers most motor leads up to the contactor's rating. Rated at 10 A at 24 V for DC-12 / DC-13 type loads, and 6 A at 230 V AC for general-purpose switching. For motor duty, the AC-2 rating at 400 V delivers 3 kW (resistive / slip-ring motor starting), while AC-4 at 400 V is rated 6.5 A for reversing or inching duty where the contactor makes and breaks stalled-rotor current. That AC-4 figure is the one to watch if your application does plugging or jogging — it's lower than the thermal continuous current, and the contactor's life depends on respecting it.
Mounting and panel fit
Mounts via screw or snap-on onto 35 mm DIN rail per EN 50022. The 45 mm width and 57.5 mm height leave room for a 3- or 4-pole block plus an auxiliary contact block on the side without crowding adjacent devices. Side-by-side mounting is permitted, so you can gang multiple contactors on a rail for multi-motor groups — just watch the 6 mm clearance to grounded sheet metal if the rail is in a painted enclosure. IP20 on the front and at the terminals means it's protected against finger contact but not washdown — standard for enclosed panel mounting, not for exposed machine-mount duty. Pollution degree 3 suits it for industrial environments with conductive dust or occasional condensation inside the enclosure.
Coordination and protection
For Type 2 coordination (no damage to the contactor on a short circuit), Siemens specifies a gL/gG fuse rated 20 A. Type 1 coordination (contactor may need replacement after fault) allows a 35 A fuse. If you're designing to IEC 60947-4-1 and need to minimize downtime after a fault, spec the 20 A fuse and verify the upstream breaker's let-through is below the contactor's withstand. The contactor's mechanical life is rated at 30 million operations typical, which is standard for the S00 frame — fine for high-cycling applications like conveyor indexing or packaging machinery, provided the electrical load stays within the AC-1 / AC-3 / AC-4 curves.