biggest breaking capacity and the top technical guide line CB with SF6 gas as arc extinguishing medium

1.General Description

LW10B-252(H)/4000-50 type SF6 circuit breaker is independently developed by Pingdingshan High Voltage Switchgear Works, which is the biggest scientific research achievement after LW10B-550/4000-63.It can break short circuit current 50KA with 0.4MPa SF6 /-40.It has the biggest breaking capacity and the top technical guide line CB with SF6 gas as arc extinguishing medium at ambient temperature 40.

Our early products such as LW10B-252/LW6-252 type circuit breakers ,of which breaking current is 40KA on condition that with 0.4MPa SF6 gas and ambient temperature -40. The rated short circuit breaking current of the circuit breaker is 50KA in south China(above -30),but it cannot run normally in the cold weather in north areas.LW10B-252(H)/4000-50 circuit breaker can widely service more than  90% of China areas under any kind of weather condition.

2.Main features

Ambient air temperature :-40/ rated current:4000A/ short circuit breaking current:50KA/opening time:20ms/mechanical endurance:3000/ etc.

 Structure of  LW10B-252(H)/4000-50 circuirt breaker :

Muti-type arc extinguishing chamber and including CYT controlling valve with no oil pipe connecting integration module hydraulic mechanism.

3.Main technical Data

item	description	Unit	LW10B-252(H)	LW10B-252
1	Rated current	A	4000	3150
2	SF6 GAS Pressure(at 20)	MPa	0.4	0.4/0.6
3	Rated short circuit breaking current	kA	50	40/50
4	Opening time	ms	20	32
5	C-O time	ms	5005	60±5
6	Breaking time	frequency	2	2.5
7	Structure of arc extinguishing chamber		Composite pressing gas type	Pressing gas type
8	Moving distance of arc extinguishing chambers moving contact	mm	230	200
9	Rated oil pressure of operation mechanism	MPa	33	28/26
10	Operating components of operating mechanism		CYT controlling valve(including electro-magnet iron/primary valve and secondary valve)
11	Coupling oil pipesnumber of operating mechanism		1(used coupling oil meter)	11
12	Oil pump		Axial motion oil pump,motor make up of a whole body.	Radial motion oil pump,which has each own system with the motor

LW10B-252(H)/4000-50 Type SF6 Circuit Breaker