Fujutsu Takamisawa Relays- Why Capacitors are Often Seen in Relays?

Fujutsu and Takamisawa merged in 1996. Since then, Fujutsu Takamisawa relays have become well known across the world. The company has become one of the leading manufacturers of reliable & enhanced quality relays. Starting from simple traffic signal controllers to complicated high voltage switchyard. Relays are present everywhere. Alongside, we also require a ceramic capacitor on the power supply to keep the relay energized for a long time. This article entirely explains relays with capacitors.

Beginners Guide to Ceramic Capacitors!

Capacitors are electrical devices used for storing energies in an electric field. Hence the name capacitor, which came from the word “capacity” suits perfectly. We call capacitors a vital part of electrical circuitry. Since relay coils produce higher voltage, Raychem chip ceramic capacitors prevent the diode from burning.

Ceramic capacitors are the most common types one may find in electrical instruments. The ceramic capacitors are non-polar capacitors that offer flexibility to use with different kinds of polarity and supply.

Based on construction, we can divide ceramic capacitors into two types- Multilayer ceramic capacitor and ceramic disc capacitor.

What is Relay & Understanding Various Types!

Relays are nothing but electrical switches. These help in opening and closing circuits electronically or electromechanically. Fujutsu Takamisawa relays are highly versatile components. And these are equally effective in simple as well as in complex circuits. It uses electromagnetism to transform minute electrical stimuli into a larger ones.

Relays are of many types and all work on different principles.

● Electrothermal relays. Manufacturers join two different materials together to form a bi-metallic strip. Whenever the strip gets energized, it bends in a way. Hence, it ends up making a connection with contacts.

● Solid-State relays. It has a semiconductor device and not an electrothermal one. Hence switching speed here is easier and quicker.

● Electromechanical relay. It uses a few mechanical parts along with electromagnetic property with it.

● Hybrid relay. It is just a combination of solid-state and electromechanical relays.

How do Relays Function?

Whenever switching and protection of several circuits are required, relays become essential. Relays differ widely in capacity, size, and corresponding uses. However, relays usually work in a normally-open condition and normally-closed condition.

In open relay conditions, we apply sufficient voltage to the core. That is when it starts to form a magnetic field. It then attracts a contact connecting with the larger or second circuit to permit current flow within.

In closed relay conditions, the fundamental here is similar to NO relay. When we do not apply voltage to the core, it cannot generate a magnetic field. Thus it does not attract movable armature.

Purpose of Putting Capacitor across Relay!

You may not believe it, but a capacitor is necessary to create critical damping. It means faster ON for relays. We often see Raychem chip ceramic capacitors in electronic sensor circuits.

With capacitor and diode, we can achieve a higher rate of closure resonating with the relay coil. Then the diode entirely damps overshoot. Since overshoot is a negative excursion, it can make the relay drop out.