SIRIUS S2 frame power contactor — 65 A at 480 V
The Siemens 3RT2037-1AN20 is a SIRIUS S2 frame power contactor rated for 65 A at 480 V, making it suitable for switching motor loads and resistive loads in industrial control panels. The 65 A rating at 480 V is the AC-3 duty current — the figure that governs motor switching capability — so this contactor handles a 3-phase induction motor drawing up to that line current without derating. Screw-type coil terminals and a screw-and-snap-on mounting system for 35 mm DIN rail per DIN EN 60715 keep panel integration straightforward.
DIN rail fit and panel space
At 55 mm wide, 114 mm tall, and 130 mm deep, the S2 frame occupies a single 55 mm slot on the DIN rail. Clearance requirements: 10 mm upward, 10 mm forward, 10 mm downward, and 6 mm at the side. Mounting position allows ±180° rotation on a vertical surface and ±22.5° tilt forward/backward, so the contactor fits tight enclosures without special bracketry.
Switching performance and mechanical life
Rated for 10 million mechanical operations typical. Maximum operating frequencies: 800 cycles/hour at AC-1 (resistive), 700 at AC-3 (motor), 400 at AC-2, and 200 at AC-4 (plugging/inching). Arcing time runs 10–20 ms; closing time 10–18 ms. The auxiliary switch is included, with 1 N/O + 1 N/C main contact configuration.
Coil and auxiliary contact ratings
Coil draws 0.36 A at 50 Hz and 0.39 A at 60 Hz at 220 V. The auxiliary contacts carry 10 A at 24 V, 2 A at 48/60 V, 1 A at 110 V, 0.9 A at 125 V, 0.3 A at 220 V, 3 A at 400 V, and 0.6 A at 440 V — these ratings define the signal-level switching capability for PLC inputs or relay coils. The contactor also carries a 10 hp rating at 230 V.
Environmental range and storage
Operating temperature spans -25 °C to +60 °C; storage range -55 °C to +80 °C. The wide storage range covers warehouse and shipping conditions — the operating limit is what governs in-panel performance.