AC current has zero point, and conversion is much easier than DC conversion. However, in application, it is generally smaller than load (through) current. For the same relay, the converted current is larger and the number of electrical life will be reduced. For example, JPK-10 has withstood hundreds of resistive load conversion at power frequency 380V and 300A, and JPK-6 can withstand 10,000 times of power frequency 220V and 50A resistive load conversion.
Capacitive discharge
Vacuum relays are often used to make capacitive circuits short to the ground (leakage) to protect personal safety. At this time, the surge current can be larger than the load current. For example, JPK-3 can discharge surge current through capacitance of hundreds of amperes, along with the discharge pulse energy withstanding 100 joules.
Pulse application
Vacuum relays are particularly suitable for use in radar impulse forming networks. For some artificial lines with duty factor and bandwidth, peak rated voltage and peak current of thousands of amperes can be used.
