An SSR or a Solid State Relay is a piece of electronic switching equipment which when applied by a small external voltage across its control terminal switches ON and OFF. SSRs have a sensor in them that reacts to a proper control signal (input), a piece of switching equipment that changes power to the load circuit, and a coupling process to empower the control signal to initiate this switch without the help of any mechanical parts. The relay might be made to switch either DC or AC to the load. It offers the same functionality as that of an electromechanical relay but comes with no moving parts.

Packaged Solid State Relay utilizes power semiconductors like transistors and thyristors to change the electrical current approximately to hundred Amperes. The switching speed of solid-state relays is comparatively faster than that of the electromechanical relays. In addition to that, it has no physical contacts to wear out. The devices using the Solid State Relays must take into consideration their higher value of “ON” state resistance as well as their lower capacity to hold out against momentary overload. In contrast to an electrochemical relay, the SSR offers only a limited amount of switching arrangement.

Operation

A Solid State Relay that works based on a particular MOSFET (or multiple ones in a parallel array) works well with DC loads. This MOSFET comes with a substrate diode which helps in the conduction of electricity in the reverse direction. Thus it is not possible for a particular MOSFET to stop the current in both directions. To carry out an AC operation, 2 MOSFET are positioned one after the other with their source pins integrated. The output side is connected with their drain pins. The substrate diodes are reverse biased alternately such that the current can be blocked whenever the relay is OFF. Whenever the relay is ON both the gates are positively biased comparative with the source by the photograph diode.

Parameters

Solid State Relay is governed by several parameters. They are:

• Required activating output current and voltage
• Required activating input current and voltage
• AC or DC
• Resistance or potential drop affecting the output current and thermal resistance.
• SSRs are much less sensitive to operating environment and storage factors like humidity, mechanical shock, external magnetic fields, and vibration.

Advantages of SSR over Mechanical Relays:

• Slimmer and smaller than a mechanical relay.
• It carries out a totally silent operation.
• The switching speed of SSRs is much faster than that of electromechanical relays.
• The output resistance does not vary regardless of the amount it is utilized.
• The operation is bounceless and clean.

Disadvantages:

• For the gate charged circuit an isolated bias supply is needed.
• There is a chance of false switching because of the voltage’s momentary variations.

Hope you liked going through the article on Solid State Relay. Brands that make SSRs are Crydom, Omron and Phoenix Contact. Make sure to follow them using the links as provided here. Thank you for reading.

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A switch that can be operated electrically is known as a relay. It consists of several operating contact terminals as well as a group of input terminals for multiple or single control signals. The switch might come with a different number of contacts in several contact forms, like break contacts, make contacts, etc.

Relays have found its uses at places where several circuits need to be controlled by a particular signal or where it is important to control the circuit by a low power signal which is independent. Firstly relays were utilized as signal repeaters in long-distance telegraph circuits. Here they used to revive the signal rolling in from one circuit by broadcasting it on another circuit. Relays were utilized excessively in early computers as well as telephone exchanges to carry out logical operations.

The basic version of relays takes the help of an electromagnet to open or close the contacts, however, other working standards have been concocted like the solid-state relays which utilize the semiconductor properties for controlling. Relays that comes with multiple operating coils and adjusted working attributes are utilized in protecting electrical circuits from faults and overload. In current electric power frameworks, these capabilities are taken care of by digital instruments known as protective relays.

Types of Industrial Relay

• Coaxial Relay – Whenever a single antenna is shared between a radio receiver and a transmitter, coaxial relays are used. It helps in switching the antenna from the receiver to the transmitter. Thus the receiver is defended from transmitter's high power.

• Contactor – A heavy-duty relay that comes with a high current rating which is utilized for switching lighting loads and electric motors is known as a contactor.

• Force-guided contacts relay - These types of relay come with contacts that are linked together mechanically such that whenever the relay coil gets energized or de-energized, all of them moves together.

• Latching Relay – A latching relay is basically an electromechanical switch that helps in controlling small flow of electrical current with a larger flow of current.

• Machine tool relay - A machine tool relay is a relay that is used mainly for industrial control of transfer machines, machine tools, etc.

• Mercury Relay – The relay that takes the help of mercury as a switching element is known as mercury relay.

• Multi-Voltage relay – These relays are made in such a manner that they can withstand a wide range of frequency (0 to 300 Hz) as well as a wide range of voltage (24 to 240 VAC).

• Polarized relay – This relay positions the armature in between the poles of a permanent magnet only with a motive to increase sensitivity.

• Static Relay – This kind of relay comes with electronic circuitry to imitate each one of those attributes which are accomplished by moving parts in an electromagnetic relay.

This was all we have regarding Industrial Relays. Hope you enjoyed going through it. Brands that manufacture them are Phoenix Contact, TE Connectivity, and Omron. Make sure to visit them from the links as provided.

DIN rails are the long metal strips that structure the center piece of a worldwide industry standard equipment rail-mounting system. DIN rails have found its main use in attaching industrial as well as electrical control products securely, like terminal blocks, actuators, circuit breakers, solenoids, etc. inside a rack housing frame or cabinet.

In the above context, the word DIN stands for Deutsche Institut für Normung which is a German statement. When translated to English it says ‘German Institute of Standards’. The rack mounting system that we see today supporting several industrial settings was devised earlier in the late 1920s by the German. By 1950 it was completely developed and adopted, first by the neighboring countries in Europe and then across the globe.

Types

The DIN rail comes in 3 different types.

• Top Hat Section, Type Ω or Type O having cross-section that is in shape of a hat.

Top Hat Rail IEC/EN 60715

This rail is 35 mm wide and is used to mount relays, motor controllers, circuit breakers, programmable logic controllers, etc. It is also known as the TS35 DIN rail in the USA.

• C section

C Section rail AS 2756.1997 (C30)

The most popular used C section rails are C50, C40, C30, and C20. The number that is present in the suffix of 'C' specifies the net vertical height of the rail.

• G section

The G rail is utilized to hold high power and heavier components. It is mounted with the deeper side at the base, and hardware is snared over the lip, at that point pivoted until it clips into the shallower side.

DIN Rail Power Supply

This central unit for the distribution of power takes in AC line voltage and transforms it into DC voltage and is situated in an electrical cabinet placed on a DIN rail. DIN rail power supplies are most popularly utilized in electrical cabinets as well as control panels to support industry standard 48V, 24V or 12V DC. They should be guaranteed to UL60950 general purpose power supply and UL standard 508 performance and safety standards for automation in factories.

These days the market is seeing a huge drop in the prices of DIN rail modules and the reason behind this is due to intense competition and "economy of scale". Thus, they are gaining their popularity in security technology, smart home applications, and building automation.

Things to consider while choosing a DIN Rail Power Supply

If you require a perfect DIN rail power supply for your cabinet, you need to take care of a certain number of things to find the desired one.

• Input/Output – For supporting global compatibility, it is recommended to go for a wide AC input voltage range. It should accept a wide frequency range as well as cover most line voltage.

• Connection and Wiring – Wires connected to the power supply unit should have shorted cable length and largest cross-section possible.

• Low Maintenance Cost and Reliability – For professional use we recommend you to go with a costly one as you can't afford any failure but if it's required in a non-professional field where failure is not a big issue then you can opt for lower-cost equipment.

This was all we have regarding DIN Rail Power Supply. Brands that manufacture them are Omron, Phoenix Contact and Mean Well. Make sure to visit their website through the links as provided.

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