A Solid State Relay (SSR) is a relay that does not have a moving contact. In terms of operation, SSRs are not very different from mechanical relays that have moving contacts. SSRs, however, employ semiconductor switching elements, such as thyristors, triacs, diodes, and transistors.
What is SSR used for?
A solid state relay (SSR) is an electrical switch that can be used to turn things on and off using another electrical input. Unlike Electromechanical Relays (EMRs), the SSR uses semiconductor switches and optoelectronics instead of magnetism and moving contacts.
How does SSR relay work?
A solid state relay (SSR) is an electronic switching device that switches on or off when an external voltage (AC or DC) is applied across its control terminals. It serves the same function as an electromechanical relay, but has no moving parts and therefore results in a longer operational lifetime.
What is the difference between relay and SSR?
The main difference between solid state relays and general relays is that there is no movable contacts in solid state relay (SSR). Thus, SSR have a wide range of features that mechanical relays do not have. The most significant feature of SSR is that they do not employ switching contacts that will wear out physically.Apr 9, 2020
Where are solid-state relays used?
The most common application of solid state relays is in the switching of an AC load, whether that is to control the AC power for ON/OFF switching, light dimming, motor speed control or other such applications where power control is needed, these AC loads can be easily controlled with a low current DC voltage using a
What does a solid state module do?
The solid state rectification module (or solid state rectifier module) uses power components (such as power diodes, power thyristors, rectifier bridges) to rectify Alternating Current (ACAlternating Current (ACAlternating current (AC) is an electric current which periodically reverses direction and changes its magnitude continuously with time in contrast to direct current (DC) which flows only in one direction.https://en.wikipedia.org › wiki › Alternating_currentAlternating current - Wikipedia) into Pulsating Direct Current (Pulsating DC) or Rectified Alternating Current, whose direction (positive and negative) does not
What are the types of SSR?
According to the type of load, SSR can be divided into two types: DC Solid State Relay (DC-SSR) and AC Solid State Relay (AC-SSR). The DC-SSRs act as a load switch on the DC power supplies, and the AC-SSRs act as a load switch on the AC power supplies.
How much heat does an SSR generate?
The Solid-state Relay (SSR) is too hot to touch. Does it have any trouble? Although when the maximum current flows in the rated range, the temperature of the SSR reaches around 80 to 100 degrees, it is not abnormal. However, pay careful attention to the heat loss.
Does an SSR need a heatsink?
HEATSINKS AND SSRs. Adequate heatsinking, including consideration of air temperature and flow, is essential to the proper operation of a solid state relay (SSR). It is necessary that the user provide an effective means of removing heat from the SSR package. Loads greater than 4 Amps will require heat sinks.
What does SSR stand for electrical?
A solid state relay (SSR) is an electronic switching device that switches on or off when an external voltage (AC or DC) is applied across its control terminals.
What is SSR temp controller?
An abbreviation for "solid state relay." A relay that does not contain any mechanically moving parts. An SSR can be combined with a Temperature Controller with a time-proportional voltage output (for driving the SSR) to control a heater. An SSR is semi-permanent because it has no contacts.
What is the type of solid state switch?
There are three basic categories of SSRs that electricians recognize: Reed Relay Coupled, Transformer Coupled, and Photo Coupled. The Reed Relay Coupled SSR has a control signal applied directly to the coil of a reed relay. When the reed switch closes it activates the circuitry which will trigger the thyristor switch.
How do I choose SSR?
When choosing a solid state relay (SSR), the choice should be based on the respective application conditions and the technical capabilities of the SSR itself. It is important to take into account the overcurrent and overvoltage conditions in the circuit versus the SSR ratings.