SIRIUS S0 contactor — 110 VDC coil, spring terminals
The Siemens 3RT2326-2BF40 is a size S0 contactor from the SIRIUS product brand. It carries a 110 VDC coil with spring-type terminals. The rated operating range spans 0.8 to 1.1 times the rated value. Mounting is screw-and-snap-on onto 35 mm DIN rail per DIN EN 60715. The mounting position allows ±180° rotation on a vertical surface and ±22.5° tilt forward/backward, which gives panel builders flexibility in tight enclosures. Clearance requirements: 10 mm upward, 10 mm forward, 10 mm downward, 6 mm at the side — these are the minimum air gaps for heat dissipation and arc containment.
Termination and wiring details
The coil connection uses spring-type terminals. The main contact terminals accept solid conductors: 2x (0.5 to 2.5 mm²) or stranded 1 to 10 mm². The auxiliary switch terminals accept 2x (0.5 to 2.5 mm²) solid or stranded. Strip length for spring terminals is typically 8 to 10 mm — no screw torque to check, but verify the ferrule is fully seated to avoid intermittent contact under vibration.