Types Of Electrical Relays

There are so many types of electrical relays and aside from knowing them, it would be best if we take a glimpse of what each one does. Here are the relays:

  • Latching relays
  • Reed relays
  • Polarized relays
  • Buchholz relays
  • Overload protection relays
  • Solid state relays
  • Inverse definite minimum time relays
  • Differential relays

Latching relays

This relay is not dynamic. Even after being actuated or moved, it still remains the same as to how it was initially. Internal magnets are also known to consist in latching relays. Because of these, no power is required to maintain its positioning.

Reed relays

These relays are similar to electromechanical relays. They also produce mechanical actuation that is true for a circuit path – both open or close. However, these relays have small mass if we compare it to the electromechanical relays. They also have low mass.

Polarized relays

As the name itself suggests, they are energized by the direction of the current. They are very sensitive to such and this is why they call this relay a type of DC electromagnetic relay. The magnetic circuit in these types consist of armature and actual electromagnets.

Buchholz relays

These relays are actuated and are considered to be operated by gas. These relays are also fault finder as they call it, because of the fact that it detects fault both minor and major. You can see them mostly in conservator or transformer tanks as they are used here for protection.

Overload protection relays

Electrical motors and circuits also have their own guards and protectors. This is where the overload protection relays come in. They are specifically designed to protect. They sense it when there is a potential overload of energy being carried and automatically shuts the system or component down to protect it.

Solid state relays

Thyristors, BJTs, TRIACs, MOSFETS, IGBTs – these are the solid state components used by the solid state relays. These are used in performing and switching operations.

Inverse definite minimum time relays

The definite time current can be figured out through this relay. These relays are mostly used as the distributors of the lines and protector of it at the same time. Its operating time is not proportional or inversely adjacent which enables it to pick up its value.

Differential relays

These relays operate when there is an excess of the predetermined value. A comparison must be seen in order for it to work.

The above are the different electrical relays. A lot, really but definitely educational and informative!