Changeover Knife Switch: 98.5% Efficiency, 15K Cycles

At the core of our changeover knife switch is a patented arc-chamber design that features magnetic blowout plates and pressure-relief vents. In high-current switching, the arc temperature can reach up to 8,000°C. Our design forces the arc upward into a specific splitter plate system, cooling and splitting it into multiple smaller series arcs. This extinguishes the arc in a mere 4-5 milliseconds, which is 30% faster than conventional switch designs. This rapid arc extinction reduces contact erosion, lengthens electrical life to 15,000 cycles, and diminishes the thermal stress on adjacent insulation. For operators, this means that even in an emergency stop of a motor (AC-23A duty), the elevated case temperature remains below 30 K, preventing burns or ignition.

Understanding that panel space is premium, our changeover knife switch is designed with modularity in mind. The base is made of glass-reinforced polyamide (PA66) with a UL94V-0 rating, saving 15 to 30% of installation width compared to fixed-type switch disconnectors. You can choose front terminals for visible wiring or rear terminals for a tidy, back-to-back configuration in control panels. Additional auxiliary contacts snap onto the side, allowing remote status indication without increasing the footprint. The handle can be positioned for direct or extended operation (door interlock available). In a typical distribution board, this permits the switch to be mounted side-by-side with other devices, as there is no heat accumulation issue.