SIRIUS Power Contactor 3RT2038-1AV04 — 65 A AC-3, Size S2, DIN Rail
The Siemens 3RT2038-1AV04 is a SIRIUS power contactor in Size S2, rated for 65 A at 480 V in AC-3 duty — that's the motor-switching current that governs real-world conveyor, pump, and fan loads. The screw-type main and coil terminals accept up to 2x 2.5 mm² stranded or solid, so no ferrule crimping is needed for panel wiring. 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 flexibility in tight enclosures.
Panel Fit — Dimensions and Clearances
The contactor measures 114 mm high, 55 mm wide, and 174 mm deep. The width is the critical dimension for DIN-rail spacing — at 55 mm, it occupies roughly three 18 mm module positions.
Maximum operating rates vary by duty: AC-1 (resistive) at 700 cycles/h, AC-2 (slip-ring motor) at 350 cycles/h, AC-3 (squirrel-cage motor) at 500 cycles/h, and AC-4 (plugging/inching) at 150 cycles/h. The AC-3e rating matches the AC-3 rate at 500 cycles/h. Switching time at AC is 10–18 ms. For a commissioning engineer, these numbers confirm the contactor is rated for moderate-speed cycling, not continuous high-speed switching — that's typical for a Size S2 frame.