Medium Voltage Vacuum Load Break Switch (Switch-fuse Combination), FZN25-24D/FZRN25-24D

This air-insulated load break switch is a control and protection device used in three phase AC 50Hz 24kv power distribution networks, suitable for power distribution stations of urban buildings, industrial production companies, mining sites, etc.

Environmental Conditions Ambient temperature: up to 40°C, greater than -25°C (can be stored at 30°C); Altitude: lower than 1000 m; Relative humidity: daily average ≤ 95% ( 20°C), monthly average ≤ 90% ( 20°C); Earthquake intensity: ≤ magnitude 8; The ambient air is not significantly polluted by corrosive gases, flammable gases, or vapors; Areas without severe vibration; Pollution level does not exceed level II;
Technical Parameters

Item	Unit	Parameters
		FZN25-24D/T630-20	FZRN25-24D/125-315
Rated voltage	KV	24
Rated frequency	HZ	50
Rated current	A	630	125
Power frequency withstand voltage(1min)	kV	arc extinguishing chamber 65; clearances toboth earthed and live parts 65
Lightning impulsewithstand voltage(peak)	kV	clearances toboth earthed and live parts 125
Rated short-time withstand current	kA	20
Rated short-circuit duration	S	4
Rated peak withstand current	kA	50
Rated closed-loop breaking current	A	630
Rated short-circuit breaking current	kA		31.5
Rated short-circuit making current	kA	50
Auxiliary circuit rated voltage	V	AC,DC/220,110
Vacuum interrupter	Times	10000/2000
Earthing switch		2000