What It Is and What It Does
The Siemens 3RT1015-1AG61 is a SIRIUS power contactor in frame size S00, designed for switching motor loads and resistive loads in control panels. It is rated for a 24 VDC coil, pulling in at 10 A at 24 V rated value, and carries motor power ratings of 3.5 kW at 500 V and 4 kW at 690 V. For AC-2 duty at 400 V it is rated at 3 kW, and for AC-4 duty at 400 V it handles 6.5 A — the AC-4 figure governs reversing or inching applications where the contactor makes and breaks the motor current under load.
Panel Integration and Mounting
Mounts via screw and snap-on onto a 35 mm standard mounting rail per DIN EN 50022. The 45 mm width and 57.5 mm height fit into a standard DIN-rail enclosure bay; depth is 72 mm, which clears most 80 mm deep enclosures. Side-by-side mounting is permitted, so multiple contactors can pack tightly on the rail without derating for heat buildup — the S00 frame is designed for this. Terminals are screw-type for both the main current circuit and the auxiliary/control circuit. Accepts solid or stranded conductors: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or max 2x (0.75 to 4 mm²). AWG equivalents are 2x (20 to 16) and 2x (18 to 14), with a single 12 AWG allowed. This covers standard panel wiring up to 4 mm² for the power circuit.
Switching Capacity and Duty Ratings
The contactor's switching capacity varies by voltage and duty type. At 24 V rated value it switches 10 A; at 60 V rated value 2 A; at 110 V rated value 1 A; at 220 V rated value 0.3 A; at 230 V rated value 6 A; at 400 V rated value 3 A. These figures cover the resistive and light inductive load range. For motor loads, the AC-2 rating at 400 V is 3 kW, suitable for slip-ring motors or moderate starting duty. The AC-4 rating at 400 V is 6.5 A, which is the figure to use for plugging or inching cycles where the contactor interrupts stalled rotor current. Mechanical endurance is rated at 30 million operating cycles typical, which reflects the S00 frame's design for high-cycle applications like conveyor or packaging lines. The coil holds at 24 VDC nominal with an operating range of 0.85 to 1.1 times rated voltage at both 50 Hz and 60 Hz.
Protection and Environmental Ratings
IP20 protection on the front and at the terminals means the contactor is protected against solid objects larger than 12 mm (fingers) but not against moisture ingress — it is intended for dry indoor panel installation only. Operating temperature range is -25 to +60 °C during operation, covering most industrial enclosure environments. Pollution degree 3 per IEC 60947-1, meaning it tolerates conductive pollution in industrial atmospheres where occasional condensation occurs.
Short-Circuit Coordination
For Type 2 coordination (no damage to the contactor after a short circuit) the required upstream fuse is gL/gG 20 A. For Type 1 coordination (contactor may need replacement after fault) the fuse is gL/gG 35 A. These values are for the main circuit and should be matched to the available fault current at the panel.