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 I plant the production of low-voltage composite switch for low voltage reactive compensation capacitor on-off control. The basic principle of combination switch SCR is connected with the magnetic latching relay, and. The composite switch is turned on and off instantly with zero switching SCR advantages, and in the normal turn during the switch but also has access to the advantages of no power. 
 First, the composite switching technology parameters 
 1. Working conditions 
 Ambient temperature: -15 ℃ ~ +45 ℃; 
 Relative Humidity: 40 ℃, 20% to 90%; 
 2. Rated voltage, rated current of power and 
 Rated voltage: 380V three-phase four-wire AC 50HZ; 
 Tolerance: not more than three-phase voltage synchronous change ± 20%; 
 Waveform is sine wave distortion less than 5%; 
 Rated Frequency: 50HZ ± 5%; 
 Rated current: 24/30/38/45/60A. 
 Third, the composite switch features 
 1. Zero switching: 
 The basic principle of combination switch SCR is connected with the magnetic latching relay, and to achieve zero-voltage and current zero-crossing turn-off, the composite switch turned on and off instantly with zero investment SCR switch cut benefits, and in the normal turn during the switch but also has access to the advantages of no power. Its implementation is: when input voltage is zero in the first zero-crossing triac triggering instant, and then latching relay conduction; and cut out when the first latching relay is off, SCR zero-delay off, in order to achieve current zero removed. 
 2. Composite switch with MCU control and monitor the SCR switching, relay and input power and load operating conditions, which have the best protection: 
 1) Power supply voltage phase protection: Work phase power supply, the switch refused to close; connected to occur after the automatic retirement investment phase; 
 2) voltage protection: V ≤ rated voltage (220V) when the switch is 20% refused to close; 
 3) Self-diagnosis Fault Protection: System automatically monitors SCR, magnetic latching relay running, if it fails, then refused to vote in closed or automatically back off; 
 4) The power conservation: case of sudden loss of power when switched on, automatically trip off. 
 3. No harmonic injection: As the turn-on moment is zero by the thyristor trigger delay after the relay, turn, and turn on the relay will not produce harmonics. 
 4. Low-voltage composite switch power consumption: the use of magnetic relays, control action only in the moment of switching power consumption, usually not a power; and because the magnetic latching relay contact resistance is small, and therefore no heat, so do not need external heat sink or fan, reducing the cost. Completely burned to avoid the phenomenon of SCR, but also running on the same machine does not cause harm to other electrical appliances, thereby achieving the purpose of energy saving. 
 5. Composite switch the input signal and the composite switch optical isolation: anti-interference ability, reliable and safe. 
 6. I composite manufacturers to produce low-voltage switch products using advanced control technology with the latest electronic components, compared with similar products, safety and reliability in the inrush current and high performance advantages with respect