Vacuum contactors handle high-voltage, high-current switching in a sealed vacuum bottle — no arc chute maintenance, no contact erosion visible externally.
Key Ratings and Their Meaning
The AC-3 maximum switching rate of 750 operations per hour means this contactor can cycle a motor start/stop every 4.8 seconds continuously — typical for conveyor sections or pump skids that cycle frequently. The AC-4 rate drops to 250 ops/h, reflecting the heavier arc wear from reversing or inching duty. The vacuum bottle itself is rated for 10 million typical mechanical operations, so the contactor will outlast most panel rebuild cycles. Stranded cable range 70–240 mm² on the power terminals; the coil uses screw-type terminals accepting 2x (0.5–1.5 mm²) solid or 2x (0.75–2.5 mm²) stranded. That coil wiring range matches standard 1.5 mm² control cable — no adapter lugs needed. Mounting position allows ±22.5° tilt on a vertical surface, or horizontal standing — useful for tight enclosures where the contactor must sit on its back.
Fastened by screw fixing through a single 11 mm hole. The S12 footprint measures 214 mm high × 160 mm wide × 225 mm deep. These spacing numbers are the minimum for arc-flash and heat dissipation — don't crowd it.