　　LW55 Series of SF6 Dead Tank Circuit Breaker, including LW55-252, LW55-363, LW55-550 and LW55-800, are used for making and breaking normal current, fault current and switching lines to realize the control, measurement and protection of power system.

　　With the advantages of excellent breaking performance, reliable mechanical properties, advanced tightness technology, high design parameters, the whole structure of circuit breaker is compact, with stable and reliable performance and long endurance.

　　●Main Features

　　1 The circuit breaker is of strong breaking capacity, long electrical endurance.

　　2 LW55 Series have excellent antiseismic and antipollution capacities, which make it suitable for those polluted places and higher elevation areas.

　　3 The oil pressure in hydraulic mechanism is automatic controlled and it can’t be affected by the temperature.

　　4 There are almost no external pipe for this new type of hydraulic operating mechanism, the possibility of oil leakage is reduced.

　　●Technical Parameters

Specifications		Unit	Value
Rated voltage		kV	252	363	550	800
Rated current		A	4000			5000
Rated frequency		Hz	50/60
Rated short-time withstand current (r.m.s)		kA	50
Rated peak withstand current		kA	125
1min power frequency withstand voltage (r.m.s)	To earth/Between phases	kV	460	510	740	960
1min power frequency withstand voltage (r.m.s)	Across isolating distance	kV	460 +(154)	510 +(210)	740 +(315)	960 +(460)
Lightning impulse withstand voltage (peak)	To earth/Between phases	kV	1050	1175	1675	2100
Lightning impulse withstand voltage (peak)	Across isolating distance	kV	1050 +(200)	1175 +(295)	1675 +(450)	2100 +(650)
Rated operating impulse withstand voltage (peak)	To earth/Between phases	kV		950	1300	1550
Rated operating impulse withstand voltage (peak)	Across isolating distance	kV		850 +(295)	1175 +(450)	1300 +(650)
Rated SF6 gas pressure（20℃）		MPa	0.6
Rated SF6 annual leakage		%	≤0.5

LW35S-252 SF6 Live Tank Circuit Breaker

LW55-252/363/550/800 SF6 Dead Tank Circuit Breaker