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Why Use a Relay? Why Use a Relay in a Car? A relay is an electrically operated switch. They commonly use an electromagnet coil to operate their internal mechanical switching mechanism contacts. When a relay contact is open, this will switch power ON for a circuit when the coil is activated.
The example relay diagrams below show how a relay works. Why use a Relay? Relays allow a low current circuit to control one or more higher current circuits. For example, when the utility voltage exceeds or is lower than the action voltage of the protector, the protector can quickly and reliably cut off the load power supply to protect the electrical appliances and personal safety. When the mains voltage returns to normal, the protector automatically turns on the power supply and restores the power supply.
Now it is more and more popular in the family. Current relay is the most commonly used component in power system relay protection. The current relay has the advantages of simple connection, fast and reliable operation, convenient maintenance and long service life. As a protection element, current relay is widely used in overload and short-circuit relay protection lines of motors, transformers and transmission lines.
The detection object of current relay is the current change of circuit or main electrical components. When the current exceeds or is lower than a certain setting value, the relay acts to complete the control and protection function of the relay.
Current relay can be divided into electromagnetic current relay and static current relay by structure type. Magnetic latching relay is a new type of relay developed in recent years. It is also an automatic switch.
Like other electromagnetic relays, it can switch on and off the circuit automatically. The difference is that the normally closed or normally open state of magnetic latching relay completely depends on the action of permanent magnet, and the switching state of magnetic latching relay is triggered by a certain width of pulse electric signal.
Solid state relay SSR is a contactless switch composed of microelectronic circuits, discrete electronic devices and power electronic power devices. The isolation device is used to realize the isolation between the control end and the load end.
The input of solid state relay uses tiny control signal to drive large current load directly. It uses the switching characteristics of electronic components such as switching transistor, bidirectional silicon controlled rectifier and other semiconductor devices to achieve the purpose of connecting and breaking the circuit without contact and spark, so it is also called "contactless switch". It is a four terminal device with two terminals as input terminals and two terminals as output terminals.
The isolation device is used in the middle to realize the electrical isolation of input and output. According to the type of load power supply, solid state relay can be divided into AC type and DC type.
According to the switch type, it can be divided into normally open type and normally closed type. According to the isolation type, it can be divided into hybrid type, transformer isolation type and photoelectric isolation type, and the photoelectric isolation type is the most.
Thermal relays generally consist of heating elements, control contacts and action systems, reset mechanisms, current setting devices and temperature compensation elements. It generates heat from the current flowing into the heating element, which causes the bimetallic strips with different expansion coefficients to deform. When the deformation reaches a certain distance, it pushes the connecting rod to disconnect the control circuit, thereby causing the contactor to lose power and the main circuit Disconnect to realize the motor overload protection.
As the overload protection component of the motor, thermal relay has been widely used in production due to its small size, simple structure and low cost. The time relay is a kind of relay that when the input action signal is added or removed , the output circuit needs to pass through the specified accurate time to produce jump change or contact action. When the ignition is turned off the power to the coil of Relay 1 is cut which cuts the power to the coil in Relay 2 and breaks the starter motor solenoid circuit, so the engine cannot be started again without going through the above routine.
The momentary switch can be mounted out of sight and acts a simple starter inhibit security device. This supply also feeds the other side of the momentary switch. Need some hints, tips or guidance on 12V electrics? Visit our Knowledge Centre for a wealth of useful information. Watch our YouTube "how to" guides here. We accept telephone orders Call Relay Guide Overview What is a relay?
Why might I want to use a relay? There are several reasons why you might want or need to use a relay: Switching a high current circuit using a lower current circuit This is the most common reason and useful where an in-line switch or the existing circuit does not have the capacity to handle the current required.
Cost saving High current capacity wiring and switches cost more than lower current capacity versions, so by using relays the requirement for the more expensive components is minimised. Activating more than one circuit from a single input You can use a single input from one part of an electrical system e. All Rights Reserved. Company Reg no.
Business Hours: Mon - Fri 9am - 5pm. Email: sales 12voltplanet. Product Categories. Construction and operatio n Inside a relay This is what the inside of an ISO mini relay looks like: A copper coil around an iron core the electromagnet is held in a frame or 'yoke' from which an armature is hinged.
How they work When the coil is supplied with voltage a magnetic field is generated around it which pulls the hinged armature down onto the contact. Terminal numbering convention The terminal numberings found on a relay body are taken from DIN which is a German automotive industry standard that has been widely adopted and allocates a numeric code to various types of electrical terminals found in vehicles.
The most simple form of relay. The circuit between terminals 30 and 87 is made on energisation of the relay and broken on de-energisation, known as NO or vice-versa for a NC relay. Two circuits terminals 87 and 87a have a common terminal When the relay is at rest 87a is connected to 30, and when the relay is energised 87 becomes connected to 30 but never both at the same time. Relay with double output. Adding driving lights that come on with the headlight main beam.
The relay contacts open to their normal state and stop the current flow to light. There you have it. A relay circuit. Now these diagrams are known as relay logic or ladder diagrams. It's using relays to control the circuit and also the diagram will begin to take the shape of a ladder as the relay logic grows.
It will continue downward as you will see later on. Now in the diagram below I have added a motor starter. A motor starter is just another name for a certain type of relay that is used to control a motor. We'll call this MTR1 Motor1.
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