Solid State Relay Varistor
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Solid State Relay Varistor
Solid State Relay Input. One of the main components of a solid state relay (SSR) is an opto-isolator (also called an optocoupler) which contains one (or more) infra-red light-emitting diode, or LED light source, and a photo sensitive device within a single case. …
Solid State Relay Number of poles Switching mode Rated operational voltage Control voltage Rated operational current Ordering Key Solid State Relays The instant-on relay with DC control input can be used for phase control. The built-in varistor secures transient protection for the heavy industrial applications, and the LED indicates the status
· General purpose solid state relay with a wide lineup of applied loads, 5 to 90A. · Small version of internal equipment type, unified mounting angle. · Varistor built-in (except for model G3NA-D210B), superior for external surge absorption. · Operation viewable due to operation display lamp. · Includes protective cover for safety.
So, when the load type is an inductive load, the output terminal of solid-state relay should connect a varistor with a withstand voltage of 1.6-1.9 times the load voltage. The counter EMF is an indefinite value that varies with L and di/dt, and if the current rate of change (di / …
You can find solid state relays which are specifically tailored towards either AC or DC input or output, they offer surge protection and an LED indication if there is zero voltage. You can also discover SSR's with low profile relays which makes them ideal to be incorporated into small equipment. What other types of relay are there?
The AQ-A Series Solid State Relay is a compact size small terminal DC type Solid State Relay. It features an output-side terminal cover for safety with an input side cover available as an option. Along with LED indication, the AQ-A Series has a built-in Varistor that is excellent for surge absorption. Suggested applications for use include heating, Industrial, temperature control, and more!
All solid state relays develop heat as a result of a forward voltage drop through the junction of the output device. Beyond a point, heat will cause a lowering (or derating) of the load current that can be handled by the SSR. “Heatsinks” are used to create a method of removing heat away from the relay, thus allowing higher current operation.
To determine if the solid state relay is overheated, the relay is operated at full load for at least one hour. An IR (infrared) noncontact temperature test instrument or thermal imager is used to measure the heat on the relay. The heat should be no more than 75% of the relay’s maximum heat rating.
Panasonic Solid State Relays Cautions for Use. Search Keyword. AUTOMATION CONTROLS. Search Discontinued Products. Sign In / Register. ... refer to “Data and Cautions for Use for respective relay”. Table 1 Dedicated on-board heat sinks. Type Heat sink ... Use a CR surge absorber or varistor across the load power supply or SSR.
Sparkfun Solid State Relay Board; The schematic is shown below for the Sparkfun Solid State Relay board seen above. It uses a Sharp SSR module and can switch 125VAC at 8A (AC only - not DC). Note that it also requires a driver circuit and the external wire connections are the same as the relay board.
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