The ZFN21-12D/T630-20 and ZFN21-12DRЛ125-31.5 high-voltage vacuum load switches and combination electrical apparatus are designed for three-phase AC 12KV, 50Hz distribution systems. These devices boast a compact structure, small size, lightweight design, long lifespan, strong switching capability, and reliable safety. When used in conjunction with fuses (referred to as combination apparatus), they can replace the more expensive circuit breakers. Their operation and...