1. Overview
The low-voltage composite switch is a product used for switching capacitors in a low-voltage reactive power compensation device. The basic working principle is to connect the thyristor and the magnetic holding relay in parallel, controlled by the internal single-chip microcomputer, and the thyristor bears the zero-crossing switching at the moment of input and cut-off, and then the magnetic holding relay is turned on. The composite switch has the advantages of zero-crossing switching without inrush current, and the low power consumption of the AC contactor.
2. Model description
Table 1 Selection table
Note: The shape of the composite switch is divided into two types, A and B. The size of the B type composite switch and the A type composite switch are different. The maximum rated current of the B type is 70A. The other electrical properties are the same. The selection needs to be dimensioned. If not, the default selection is A type .
3. Technical Indicators
Environmental conditions
Altitude：≤2000m
Ambient temperature：-25～70℃
Relative humidity：40℃，≤90%
Atmospheric pressure：79.5～106.0Kpa
No conductive dust,egyptian, corrosive gas,flammable and explosive medium
Rated voltage
Three phase：AC380V±20%，50Hz±10%
Single phase：AC220V±20%，50Hz±10%
Working power：Three phase：AC380V±20％ 50Hz ± 10%
Single phase：AC220V±20％ 50Hz ± 10%
Power supply voltage harmonic distortion rate:≤5%
Control voltage:DC 5V-12V, 10mA/channel control with acceptable control output
Basic parameters
Current specification:45A、55A、70A、80A、110A（maximum rated current is 70A for B-type dimensions）
Power waste:≤3VA
Dynamic response time:complete the action in 1 second after the controller sends out input and removal signals
Repeated switching time: Since the previous excision was completed,controller can excute the action again after 2 seconds
Mechanical life of magnetic retaining relay:106 times
4. Wiring
Terminal of Three-phase compensation
Dispersion Three-phase compensation
