Electrical setups that you will have to ensure

A relay is a switch that can be electrically controlled. This device can also be understood as an electro-mechanical controller. It was invented by the American scientist who discovered the electromagnetic phenomenon of self-inductance and mutual inductance. This principle allowed him to create a type of electromagnet that when activated can control a switch, this is the principle of the relay.

What is a relay – relay applications

Relays are primarily used in systems that require controlling a load or using a switch that can be electrically or mechanically controlled. One of the original applications was to use them to design finite state machines or automata. One of the current applications is to control inductive or resistive loads by means of digital control pulses. The relays are also used in test equipment, communication systems, security, measurement, power circuits, inverters or photo-voltaic power systems.

Main features

The aspects to consider when purchasing or designing applications that use developers are the following:

Type of load: (1) Inductive or (2) Resistive. For example, a motor is an inductive load and an incandescent bulb is a resistive load. A saver bulb is an inductive load and so on.

Load power. For direct current (VDC) circuits, power is calculated as P = VI, voltage multiplied by current. For alternating current circuits (VAC), it must be taken into account that the voltage and current vary with time. Thus for AC circuits the instantaneous power is calculated as:

In the case of mechanical and Electrical relays it is important to know the coil voltage. If for example the coil is 12VDC then you will not be able to do the activation via blackhawk supply directly.

Induced noise. Mechanical actuation of some relays can generate electrical noise on sensitive digital stages. So if your design is very sensitive you can opt for non-mechanical relays.

Activation energy. They can consume a considerable amount of current on activation, comparing it with some other actuator such as LEDs or digital stages. If your application requires working with a limited power source you have to consider it.

Requires additional electronics. Generally for mechanical relays, an additional stage is required between the digital control electronics and the developer. Some circuits can be transistors or TRIACs that act as a digital switch between the microcontroller or microprocessor and the relay if it requires operating at a control voltage higher than that of the control electronics. Change some relays, circuits are placed that allow isolating the power electronics from the control electronics by means of opto-couplers.

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