Siemens SIRIUS 3RT1024-1AG20-ZX95 — Size S0 Power Contactor
The Siemens SIRIUS 3RT1024-1AG20-ZX95 is a size S0 power contactor rated for motor switching up to 7.5 kW at both 500 V and 690 V. It carries an AC-4 rating of 12.5 A at 400 V for reversing or inching duty, and an AC-12 maximum operating current of 10 A for resistive loads. The contactor mounts via screw or snap-on onto 35 mm DIN rail per EN 50022, fitting a 45 mm wide footprint.
What the Ratings Mean for Your Panel
The 7.5 kW rating at 690 V tells you this contactor handles a 3-phase induction motor up to that power on a 690 V line. The AC-4 rating of 12.5 A at 400 V is the one to watch for plugging or jogging applications — that duty cycle generates more arc wear than AC-3, so the contactor is sized for it. For type 2 coordination (no weld under fault), the required upstream fuse is 25 A gL/gG; for type 1 coordination (welding allowed, no fire risk), it's 63 A gL/gG. The operating temperature range of -25 to +60 °C covers most indoor panel environments without derating. At 45 mm wide and 91 mm deep, the S0 frame fits standard 35 mm DIN-rail enclosures. Side-by-side mounting is permitted, with a 6 mm spacing required at the side for heat dissipation. The screw-type terminals accept conductors up to 2x 10 mm² stranded or 1x 8 AWG, with solid wire options from 0.5 to 4 mm².