Application

1.Ambient air temperature
A.The upper limit of ambient air temperature in the installation place shall not exceed+40→ and the lower limit not less than -5→.
B.The average temp. value shall not exceed+35→ within 24 hours.
Note:Referring to the working condition that lower limit of ambient air temp. is -10→ or -25→, the user shall indicate that in the order.
2.The height above sea level for installing the switch shall not exceed 2000m.
Note: If installation place for switch is above 2000m, the user shall indicate that in the order.
3.When at max. temperature of +40→, relative humidity of air shall not exceed 50%. Higher relative humidity such as 90% at the temperature
of 20oc is allowed under lower temperature. Special measure shall be taken against occasional condensation caused by temp. change.
4.The pollution grade: grade 3 for surrounding environment of switch.
5.The switch shall be vertically installed in the place without vibration or shock.

 Structural Features

The switch is composed of two parts: steel base and plastic cover board. 3 pairs of clamp contacts and arc-extinguishing chamber are mounted on the base with insulating spacer. The fuse body is mounted on the cover board, directly serving for moving contact blade. The cover board can turn around the hinge pin and open in sector shape so that the fuse body can be completely pulled out from the socket. The upper cover can be removed from the base easily so as to facilitate the installtion of switch, and safely change the fuse body. The arcextinguishing chamber of switch is made of plastic through pressing. For its simple structure, it can be easily dismantled or assembled. Each arc-distinguishing chamber is composed of inner and exterior compartments and mounted with arc metal corner. That can increase arcextinguishing ability, eliminate the danger of flashover, and prolong the service life of contact. The switch is also designed with a spring
energy-storage mechanism for quick switching, enabling it to quickly and safely actuate under extremely heavy condition. In addition, the switch is mounted with LX19K travel switch. If attached with a fuse body with firing pin, when the fuse body of some phase is blown, the firing pin will spring out and actuate the travel switch via a transmission shaft. Thus the singal of loss of phase is sent out to alarm for taking measurement.

 Main Technical Data

1.Rated insulation voltage:690V
2.Rated working voltage: 380V, 690V
3.Rated working current: 380V, 100A, 200A, 400A, 630A, 660A, 100A, 200A, 315A, 425A
4.Rafer to table 1 for making and breaking capability of switch and rated blowout short-circuit current.
5.Mechanical service life for switch is 1700 cycles(100A),1400cycles(200A),and 800cyces(400Aand 630A) separately.
6.Electric service life of swtich is 300 cycles(100A) and 200cycles (200 A400A ,and 630A)separately. Refer to table 2 for making and breaking conditions.
7.The rated working volatge of auxiliary switch(LX19K) is AC 380V, conventional free air heating current 5A, and rated control capacity 300VA.
8.Refer to table 3 for matching relation between switch and fuse body.