The core working principle of a Surge Protective Device (SPD) is as follows: it maintains high impedance for insulation when the circuit operates normally; when a transient overvoltage (surge) occurs, it quickly switches to low impedance for conduction to discharge excess energy; and then it restores high impedance, thereby protecting the downstream equipment. Its working process can be broken down into three key stages, and its essence lies in realizing energy discharge and circuit protection through the “high impedance – low impedance – high impedance” state switch.
SPD Device Advantages
- Instantaneous response and precise voltage limiting
- Full-scenario surge coverage
- Flexible adaptation to all scenarios
- Strong compatibility
- Mitigation of safety and production risks
- Reduction of equipment maintenance and production risks
