What is a control relay?

The

control relay is locally or remotely controlled by an electromagnetic switch that is widely used in all forms of the device due to its ability to switch higher currents than it would not be impossible without it. The control relay, which can be controlled by manually or automatically logical circuits, also electrically insulate the output voltage from the control voltage. The control relay is an electromechanical device that relies on the power of the electromagnetic field. When the relay coil is below the electric current control above the maintenance current, the relays are moved to the second of two positions. For example, when the relay contact is open, the relay energization will close the contact and vice versa.

The normal position of the relay contact is the default de-energized relay position. Is usually open or closed. The use of a normally open position is common for applications that fill the load. Usually, closed positions are usually used to close the burden. In this case, the relay coil energy opens the relay contacts.

switches are commonly used in electrical controls. If the currents require larger contacts for the switch, manual closure of the switch is uncomfortable and impractical. For example, switching a fraction of the ampere is fine with simple switches. If larger currents should be switched, the exclusion of contacts with the switch damages the switch too early, more with motors that are induction loads. A relay is added to the circuit to create durable high -performance switches.

relay switches are used in many household appliances such as refrigerators, air conditioning and washing machines. These devices need a good switch that can survive frequent switching of electrical currents with significant temporary energies. Electric relays ensure that switching does not cause excess power dissipation on the switching device, which can cause a dangerous high temperature due to the so -called generatedEchodné plasma. The relays are designed to quickly change the status of the line to prevent excessive plasma heating. Plasma heating or electrical arches also damage relays and can connect contacts together.

The main control relay is used in safety devices that eventually remove the power supply. For example, cutting and heavy pressing equipment may require a main control relay to prevent staff injury. This main control device safely turns off the device.

There are semiconductor equivalents of the control relay. For direct current circuits (DC), this includes silicon rectifiers (SCR). In the AC circuits (AC) include SCR with a diode bridge and a three-term alternating switch.