72.5-252KV SF6 circuit breaker

LW35-72.5/126/145/252 SF6 circuit breaker is designed with self-energizing theory that the arc generated in the interrupter is distinguished at a specified time with a part of energy from the arc itself. Please contact us! Email:

liujing@mec.com.cn

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Email: liujing@mec.com.cn

Skype:liujingmec

LW35-72.5/126/145/252 SF6 circuit breaker is designed with self-energizing theory that the arc generated in the interrupter is distinguished at a specified time with a part of energy from the arc itself.

The circuit breaker is designed and manufactured in good accordance with IEC standards.

LW35-72.5/126/145 circuit breaker is either three-phase gang operation with a spring mechanism or single-phase operation with three spring mechanisms.

LW35-252 series circuit breaker is equipped with three spring mechanisms to realize single-phase operation or three-phase electrical gang operation.

1. Simple structure, high rated parameter

2. Spring mechanism, compactness

3. Easy installation, low noise, high reliability

4. Double sealing system is adopted to guarantee minimum SF6 annual leakage

5. Mechanical and electrical anti-pumping function.

6. Reasonable design, compact structure, no oil-leakage, maintenance-free, 10000 times mechanical endurance.

Item		Unit	LW35-72.5	LW35-126	LW35-145	LW35-252
Rated voltage		KV	72.5	126	145	252
Rated current		A	3150			4000
Rated frequency		Hz	50
Rated short circuit breaking current		kA	40			50
Rated short time withstand current (3s)		kA	40			50
Short line fault breaking current		kA	30/36			45/37.5
Rated peak withstand current		kA	100			125
Rated out-of-phase breaking current		kA	10			12.5
Rated line charging breaking current		A	10	31.5	50	160
Rated SF6 gas pressure (at 20℃)		Mpa	0.4	0.5		0.6
Main loop resistance		μΩ	≤40	≤45		≤60
Operation sequence			O-0.3s-CO-180s-CO or O-0.3s-CO-15s-CO
Mechanical endurance		Times	10000
SF6 gas leakage（rate per year）		%	≤1%
Moisture content (V/V)		PPm	150
Creepage	Across the open contacts	mm	2300	3950	3950	9400
	To earth	mm	2300	3950	3950	7320