Part Number: EX2-2U1S

Manufacturer: KEMET

Description: Automotive Relays Miniature Signal Relays

Shipped from: Shenzhen/HK Warehouse

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EX2-2U1S Description

The most common applications for the new PC-board mount type offered by the EX2-2U1S are motor and heating controls found in automobiles. The new series presented by the NEC satisfies both the high standards of quality and performance imposed by these restrictions. In around sixty percent of cases, the miniaturization efforts of the EX2 series have been practical compared to the ET2 series. Compared to the ET1 series, the miniaturization efforts of the EX1 series have reached approximately fifty percent of their goals successfully. This is a significant improvement.

EX2-2U1S Features

  • PC-board mounting
  • Lead-free solder is used
  • 75% relay volume of ET2
  • 65% relay volume of ET1
  • 60% relay space of ET2
  • 50% relay space of ET1
  • 88% relay weight of ET2
  • 78% relay weight of ET1

What Is A Relay?

What does it imply exactly when people talk about “vehicle relay”? It is possible to comprehend the operation of an automotive relay in its most fundamental form as an electrical switch controlled electronically. The vast majority of the time, an electro-mechanically operated switch is the type that is utilized in the automobile industry. This switch type can be found in almost every vehicle. In addition to being found in automobiles and trucks, vans, trailers, and boats, these components can also be found in other cars. They do this by mechanically manipulating a switch with a device with an electromagnet built into it. This allows them to either finish an electrical circuit or break it. The type of relay utilized on the most consistent basis in the automobile sector is the standard relay, a small device in the shape of a cube. This type of relay is also referred to as a little relay.

Application & Advantages of Automotive Relays

Switching High Current Circuits

Most automotive relays in the collection switch high-current circuits with low-current circuits. Such an application arises when a standard in-line control is inadequate for switching a high-current electrical system. This could happen, for example, if you were using a bunch of powerful work lights at once. There is a risk of exceeding the loom’s capacity if the work lamps are wired so that they turn on whenever the headlights do. A car relay can fix the problem.

Putting Multiple Circuits into Operation Using Just One Switch

One of the significant advantages of utilizing the device is the capability of a relay to switch on several different circuits independently using only a single control signal. This is one of the most significant advantages. This is one of the reasons why the device is utilized by so many people all around the world. A single input within an electrical system can activate and trigger many relay switches integrated into an electrical circuit. This is possible because of the nature of relay switches. This is not impossible, given that a single electrical circuit can take many inputs of varying types.

Because of the kind of input being used, this is feasible. These relays can perform a wide variety of tasks because when a single input signal is supplied, it causes them to either fully complete or partially break many circuits. One easy-to-understand example of several actions being performed by a single switch in the real world is the central locking system seen in a vehicle. All locks will lock or unlock simultaneously in response to a single control button pressed on the system. Simple to carry out, calls for a minimal to nonexistent time commitment and achieves the desired results.

Carrying Out Logic Operations

In modern vehicles, electronic modules designed by the original equipment manufacturer (OEM) have largely supplanted relays, yet relays can still be put to rational use. Despite the widespread replacement of automobile relays in recent years, this remains a problem. Auto relays are capable of both simple and complex logical operations, such as instantaneous inputs and time-controlled operations. Auto relays can be used for various time-controlled tasks, including the delay of interior light and the regulated process of wiper blades. These tasks are now typically performed with programmed logic; however, relays provide a simple and inexpensive alternative. To someone with hobbies like automobile maintenance, installing a relay to complete a simple logical action may appear more interesting, less time-consuming, and cheaper.

Save Money

It’s not cheap to build a high-current electrical circuit. Low-current consumption components are much more cost-effective. Using an automatic relay, you may route high-current wiring just to the parts of the system that require it. After that, low-cost, low-current details can be added using relays at critical places in the circuit. As a result, overall expenditures are reduced.

How Does A Relay Work?

● Electro Magnetic Relay Structure

In the context of electromagnetic relays, a coil of wire is referred to as a solenoid. This coil has a soft iron core and is twisted around it. Connectors, a low-reluctance iron yoke, and a moveable iron armature are its distinguishing features. A relay may contain more than one set of contacts depending on its function. Connected to the movable contacts and the yoke is an armature that may pivot on its axis.

● Operation of Relay Switch Mechanism

Turning off the relay’s power creates an air gap in the magnetic circuit, which keeps the armature where it should be. This condition allows for the actual closure and opening of contacts. A relay for an automotive system would have two contacts to signal that one connection is open while the other is closed. Depending on their layout, specific relays may have more or fewer connections than others. A magnetic field is created whenever an electric current is run through the solenoid. With the help of this field, the armature is set in motion, and the contacts’ subsequent onward or backward movement either makes or breaks the circuit.


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