SIRIUS Size S10 Power Contactor for Motor Loads
The 96-127 VAC coil pulls in reliably down to 80% of rated voltage, and the contactor handles the full AC-3 duty cycle for squirrel-cage motors. Spring-type terminals on the coil save a few seconds per connection compared to screw terminals — a small thing until you've wired a hundred of them in a MCC lineup.
Ratings That Matter for the Panel Builder
AC-3 switching at up to 500 operations per hour is the number that governs motor starting duty — this contactor cycles a motor start every 7 seconds without exceeding thermal limits. AC-4 at 130 ops/h covers plugging and inching applications where the contactor breaks full locked-rotor current. The mechanical life of 10 million typical operations means this part outlasts the panel it lives in for most conveyor and pump cycles. Power cable termination accepts 70 to 240 mm² stranded copper. Auxiliary terminals take 2x 0.25 to 2.5 mm² solid or stranded. Auxiliary switch is built in. Operate time is 80 to 100 ms on both AC and DC supplies, and arcing time runs 10 to 15 ms. That consistency matters for coordination studies — the fault clearance window is tight enough to keep downstream fuses from nuisance-blowing on a motor start.
Mounting and Clearance for the Enclosure Layout
Screw fixing through a single 11 mm hole secures the contactor to the back panel. The 210 x 145 x 202 mm envelope (H x W x D) fits a standard MCC bucket depth.