The FZRN21-40.5 high-voltage vacuum load switch and combined electrical apparatus are designed for three-phase AC 40.5kV, 50Hz power systems. They are used in conjunction with power equipment, ring main units (RMUs), and compact substations, and are widely applied in wind power generation, urban grid construction and renovation projects, industrial and mining enterprises, high-rise buildings, and public facilities. These products serve as ring network power supply units or terminal equipment, performing functions such as power distribution, control, and protection. Their technical performance complies with GB16926-2009 High-voltage Alternating Current Load Switch-fuse Combinations and IEC420 AC High-voltage Load Switch-fuse Combinations.

This product features high breaking capacity, safety, reliability, long electrical lifespan, frequent operation capability, compact structure, small size, lightweight, and minimal maintenance requirements. It is capable of breaking rated current, overload current, and short-circuit current, as well as preventing equipment phase loss operation. The switch has a visibly isolated disconnection gap and is equipped with an earthing switch with closing capability and an electric spring mechanism, enabling remote control operation.