The Siemens SIRIUS 3RT1015-1AP01-1AA0 is a size S00 power contactor built for switching motor loads in control panels. It's rated 7 A in AC-3 duty at 400 V, which covers the common 3 kW induction motor on a 400 V line — that's the real-world rating that decides fit, not the resistive AC-1 number. The AC-4 rating at 400 V is 6.5 A, so it handles reversing or inching duty without derating to a smaller frame.
Mounting and panel fit
Snaps onto 35 mm DIN rail per EN 50022, or screws direct to a backplate. At 45 mm wide and 57.5 mm tall, it fits a standard 45 mm slot in the panel layout. Side-by-side mounting is allowed with 6 mm clearance to the side for heat dissipation — no forced spacing between contactors in a bank, which keeps the row dense. The screw terminals accept 2x (0.5 to 1.5 mm²) solid or 2x (0.75 to 2.5 mm²) stranded, max 2x 4 mm². That's enough for the control wiring and the main power tails on a 7 A motor circuit. AWG equivalents are 2x (20 to 16) and 2x (18 to 14), with a single 12 AWG allowed. Finger-safe IP20 on the front and terminals — standard for inside a closed panel.
Ratings and what they mean on the line
The contactor's mechanical life is 30 million operations typical, so it outlasts most machines in cyclic service. Coil operates at 50/60 Hz, 230 V rated value, with a tolerance band of 0.8 to 1.1 at 50 Hz and 0.85 to 1.1 at 60 Hz — that's the voltage range where the coil pulls in reliably. Operating temperature is -25 to +60 °C, which covers unheated plant rooms in winter and warm cabinets in summer. Altitude limit is 2 000 m without derating. For the auxiliary contact block: at 24 V it switches 10 A, at 230 V it switches 6 A, and at 400 V it switches 3 A. That's the contact rating for the control side — the main power contacts handle the motor current. Pollution degree 3 means it's rated for conductive dust and humidity typical in industrial enclosures. Fuse coordination: with type 2 coordination (no damage to the contactor on short circuit) use a 20 A gL/gG fuse. With type 1 coordination (contactor may need replacement after fault) use a 35 A gL/gG fuse. That's the spec for the upstream protection device sizing.