The Siemens 3RT2038-1AP00 is an S2-size SIRIUS power contactor — the frame that tells you the mechanical footprint and the current-handling class. At 130 mm deep, 55 mm wide, and 114 mm tall, it fits into a crowded enclosure with some breathing room: you need 10 mm clearance above and below, 10 mm forward, and 6 mm at the sides for heat dissipation and arc quenching.
Rated current and duty cycles
The headline number is 65 A at 480 V — that's the AC-3 rating for motor switching, which is the spec that matters when you're sizing for a pump, conveyor, or compressor load. Switching frequency varies by duty: 500 operations per hour at AC-3, 700 at AC-1, 350 at AC-2, and 150 at AC-4. That tells you the contactor is built for moderate-speed cycling — fine for a line that starts and stops a few times a minute, but not for a rapid-pick application. The coil operates at 230 V, 50 Hz, with a typical pickup power of 10 A at 24 V for the auxiliary circuit. Screw-type terminals on the coil make field wiring straightforward.
It carries an auxiliary switch block (18–1 configuration), so you can wire in feedback or status signals without an add-on module.