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Most electrical tools fail within 2-3 years, which is before they reach their expected lifespan. These cases mainly arise from overheating, excess voltage, short or open circuits, and mechanical shock.
Luckily, using different types of control relays can help you control the flow of electricity and prevent damage.
When selecting a relay for your devices, pick the most suitable and compatible model. This measure will enhance the lifespan of your electric gadgets and help you realize value for the money spent on the purchase.
Read on to find out more about the types of control relays, their features, functioning method, and applications.
Types of Control Relays
Control relays are available in various categories based on their application type, structural features, and function. They are also classifiable according to their operating principle or configuration.
Here are some of the most common relay types available in the market today.
1. AC and DC Control Relays
Alternating current (AC) and direct current (DC) relays are devices that rely on induction to function. However, each of these models has unique features making them applicable for different uses.
DC relays have a freewheeling diode used to control the current flow. They also use a single coil of wire twisted on an iron core to make an electromagnet. These devices are often suitable for battery-operated devices and solar panels.
On the other hand, AC relays have two loops that create a transformer to magnetize the core. They also have a laminated interior to prevent energy loss caused by eddy currents. These control relay types are ideal for devices that use alternate currents, such as home appliances.
2. Single Pole Single Throw (SPST) Relays
SPST relays are mechanical switches that have two terminal connections. Once you plug in an appliance using this device, the current will flow from one terminal to another. After power disconnection, the terminals detach, leaving the circuit open.
This control relay can have a wide range of uses in a circuit based on the type of wiring.
For instance, you can use it as a switch or a link between currencies with different paths. One application of SPST relays is in the advanced process control systems used in industrial technology.
3. Solid-State Relays
Solid-state relays are electronic devices that can switch on or off after the application of external voltage. These devices can function without moving any component and therefore have a longer lifespan than electromagnetic types.
Besides, solid-state relays can run on DC or AC and require less control energy to operate. Due to their durability and faster switching speed, these types of control relays are suitable for automobiles. Some of their functions in locomotives are light dimming, power control, and speed regulation.
4. Hybrid Control Relays
Hybrid control relays consist of both electronic and electromagnetic parts.
In most cases, the input part with control functions is electronic, while the output section is electromagnetic. These models have unique features aimed at eliminating issues associated with other types of relays.
For example, the lack of motion prevents wearing out and damage caused by contact arching in electromagnetic relays. It also minimizes voltage loss and the loss of power through heat, which is common in solid-state relays.
Find the Best Control Relay for Your Device
Buying a relay for your gadgets can be challenging if you do not know what to look out for in different models.
However, with the information provided, you can understand the differences between various types of control relays. You can also identify which relay is most suitable for specific applications.
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