Size S0 DC Contactor for Panel Integration
The Siemens 3RT2325-2BG40 is a SIRIUS contactor in the size S0 frame, designed for DC coil operation with spring-type terminals on the magnet coil. It mounts via screw or snap-on onto 35 mm DIN rail per DIN EN 60715, which makes it a direct fit into standard industrial control panels. The contactor occupies a 60 mm width and 102 mm height footprint, with a depth of 107 mm — so it fits into a standard 200 mm deep enclosure with room for wiring. Clearance requirements are 10 mm upwards, 10 mm forwards, 10 mm downwards, and 6 mm at the side, which simplifies panel layout when grouping multiple contactors.
DC Switching Ratings — What They Mean for Your Load
This contactor is rated for DC switching across a range of voltages, and the current rating drops as voltage rises — that's the nature of DC arc interruption. At 24 V rated value it switches 10 A, at 48 V it handles 2 A, at 60 V it's rated 6 A, at 110 V it drops to 1 A, at 125 V it's 0.9 A, at 220 V it's 0.3 A, at 230 V it's 10 A, at 400 V it's 3 A, at 500 V it's 2 A, at 600 V it's 0.1 A, and at 690 V it's 1 A. The arcing time is 10 to 10 ms, and the DC operate time is 15 to 18 ms. For a sourcing decision: if your load is a 24 VDC solenoid or brake drawing under 10 A, this contactor is a clean fit. For higher DC voltages, check the specific rating — the 600 V rating of 0.1 A is essentially a signal-level switching capability, not a power contact.
Wiring and Terminal Details
The main contacts accept solid conductors of 2x (0.5 to 2.5 mm²) or stranded conductors of 1 to 10 mm². The auxiliary switch is present, and the contactor includes 2 attachable auxiliary contact blocks. The spring-type terminals on the coil eliminate the need for screwdriver torque checks — just strip, insert, and pull to verify retention. This is a time-saver on repetitive panel wiring.
Environmental and Mounting Flexibility
Operating temperature range is -25 to +60 °C during operation, with storage from -55 to +80 °C. The mounting position allows +/-180° rotation on a vertical mounting surface, and it can be tilted forward and backward by +/- 22.5° on a vertical surface. This flexibility helps when fitting into tight or non-standard enclosure layouts.