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Use Attention of PCB Power relay

1. When using AC inductive load, high transient voltage and surge current are applied to the output end, which may lead to the conduction or damage of solid-state relay. Generally, voltage control devices with specific clamping voltage, such as two-wire zener diode or varistor (MOV), need to be connected to the output end. Varistor is recommended to be 1.6-1.9 times of rated voltage;
2. For DC inductive loads, such as solenoids, electromagnets and solenoid valves, freewheeling circuits must be used to suppress the back EMF generated during shutdown. Generally, a simpler method is to connect a secondary tube in reverse parallel with the load, but this circuit will affect the release time of inductive loads, such as electromagnetic relays, contacts, electromagnets and solenoid valves, A better line is that a diode and a voltage stabilizing diode are connected in reverse series, or a diode is connected in series with a resistor and then connected in reverse parallel with the load.
3. When controlling a small current load close to the minimum load current, a virtual load resistance must be connected in parallel on the load to reduce the leakage current at the output end and produce a higher residual voltage on the load.
4. When the circuit board welding installation relay is welded and installed, the welding temperature must be controlled below 260 ℃ and the welding time must be controlled below 5S.
5. In order to avoid the temperature rise of solid-state relay exceeding the allowable value, the heat dissipation effect and installation position shall be considered in the design and application. When two or more solid-state relays are installed side by side, appropriate spacing shall be reserved.