Many people tend to confuse two withstand voltage indicators: Stand-off Voltage between contacts The highest voltage that can be sustained across a contact when it is open; that is, how much high voltage it can quarantine. Coil-contact Isolation Voltage The medium between the low voltage drive coil and the high voltage contact can withstand the pressure to prevent the high voltage from entering the control circuit and burning the main control. Other key parameters: Coil voltage: 5V/12V/24VDC (industrial mainstream) Maximum switching current: generally ≤ 0.5A, only tens of mA for most models Maximum switching power: within tens of watts Action time: 0.1 ~ 2ms, much faster than vacuum high-voltage relay Insulation resistance: > 10 ¹ > 10 ~ 10 ² Ω, very low leakage current Contact form: Form A (normally open NO at most), Form B (normally closed NC), Form C (conversion SPDT) Voltage level reference: Medium voltage: 1 kV to 5 kV; high voltage: 5K V to 20 kV; a few customizations up to 25 kV