The Siemens SIRIUS 3RT2037-1CL24-3MA0 is a size S2 power contactor rated for 65 A at 480 V. It mounts via screw or snap-on onto 35 mm DIN rail per DIN EN 60715, making it a direct fit for standard industrial control panels. The operating temperature range of -25 to +60 °C covers most indoor enclosure environments without derating concerns.
Ratings and what they mean for fit
The 65 A rating at 480 V is the AC-1 resistive load current — this is the thermal current the main contacts can carry continuously. For motor switching duty (AC-3), the contactor is typically applied at lower currents; the 700 cycles/hour maximum at AC-3 gives the mechanical switching rate for repetitive motor starts. The 10 to 20 ms arcing time and 10 to 18 ms closing time are standard for this contactor class and determine coordination with upstream short-circuit protection. Auxiliary contact ratings are provided for DC control circuits: 6 A at 24 V, 2 A at 48 V, 1 A at 110 V, and 0.3 A at 230 V. These figures govern the pilot duty capability for PLC outputs or relay coils fed through the auxiliary block.
Mounting and integration
Panel footprint is 55 mm wide by 114 mm tall by 174 mm deep. The contactor accepts screw and snap-on mounting onto 35 mm DIN rail. Mounting position allows ±180° rotation on a vertical surface and ±22.5° tilt forward/backward — useful when fitting into tight or angled enclosure layouts. Clearance requirements: 10 mm upwards, 10 mm forwards, 10 mm downwards, and 6 mm at the side for heat dissipation and arc containment. Main contact wiring accepts 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) solid or stranded conductors. The magnet coil uses screw-type terminals — standard for panel wiring without special tooling.