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The main function of the relay :

    Relay is a function of the automatic isolation switching elements , are widely used in remote control, telemetry, communications relay , automatic control , mechatronics and power electronic devices, is one of the most important control elements . Relays generally reflects some input variables ( such as current, voltage, power , impedance, frequency, temperature , pressure, speed , light, etc. ) of sensing means ( input portion ) ; accused circuit able to " pass" , " oFF " control actuator ( output portion ) ; the relay between the input section and the output section , there are coupled to the input isolation , feature processing, and the output portion for driving the intermediate mechanism ( driving section ) .

Caution:

    Rated voltage : refers to the relay coil when the normal working voltage required , which is a control voltage of the control circuit . According to the relay model, AC voltage can also be a DC voltage.

DC resistance : refers to the relay coil DC resistance , measured by the multimeter .

Pick-up current : refers to the relay action can produce pull the minimum current . In normal use, the current must be slightly larger than a given pull current, so that the relay can be operated stably . For the applied voltage coil , generally do not exceed 1.5 times the rated voltage , otherwise it will have a greater current to the coil burnt.

Release current : refers to the relay generates the maximum current release action . When the relay state current is reduced to a certain extent , the relay will revert to the release of unpowered state . Then the current is much smaller than the pull current .

Contact switching voltage and current : is the relay to allow the applied voltage and current. It determines the relay to control the voltage and current size, use can not exceed this value, it will be very easy to damage the relay contacts .