The Siemens 3RT2526-2BG40 is a SIRIUS contactor in the S0 frame size, built for switching motor loads and resistive circuits in control panels. Its 24 VDC coil pulls in at 10 A rated current, and the spring-type terminals on the coil side accept 2x (0.5... 2.5 mm²) solid or stranded wire — no screwdriver needed for the magnet coil connection, which speeds up panel wiring and eliminates torque checks on that circuit. Mounts via screw or snap-on onto 35 mm standard rail per DIN EN 50022, with a mounting position that allows ±180° rotation on a vertical surface and ±22.5° tilt forward/backward — useful when fitting into tight gland-plate zones or angled sub-panels.
S0 frame and switching capacity
The S0 frame is the compact workhorse in the SIRIUS contactor family. At 24 VDC the main contacts are rated 10 A; at 125 VDC that drops to 0.9 A, and at 230 VDC it holds 10 A (likely AC-1 resistive). For DC switching duty, the arcing time sits at 10 to 10 ms, and the operate/release times at DC are 15 to 18 ms — consistent with a contactor sized for moderate DC loads rather than high-speed semiconductor switching. Mechanical endurance is typical at 10,000,000 operations. Maximum operating frequency at AC is 5,000 1/h, dropping to 1,000 1/h at AC-1 maximum.
Panel integration and wiring
Dimensions: 61 mm wide, 102 mm high, 107 mm deep — fits a standard S0 footprint on the DIN rail. Clearances: 0 mm upwards, forwards, backwards, and downwards; 6 mm at the side. That zero-clearance spec on five of six faces means you can butt multiple contactors side-by-side without derating for heat buildup in typical panel airflow. The auxiliary switch is present (yes), and the main power terminals accept 2x (0.5... 2.5 mm²) solid or stranded. Spring-type terminals on the coil eliminate the need for screw clamping on that circuit — strip length and push, no re-torquing after vibration.