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What is Relay input voltage?
General Purpose Relays are electromechanical switches, usually operated by a magnetic coil. General purpose relays operate with AC or DC current, at common voltages such as 12V, 24V, 48V, 120V and 230V, and they can control currents ranging from 2A-30A.
Can SSR be used for DC?
If the output of the SSR is just a transistor, FET, or single SCR, it can conduct only in one direction. Thus, it can only be used with DC loads, examples of which include non-line powered heaters. For AC loads, a TRIAC or SCR pairing is used. In general, the AC output SSRs can also be used for DC.
How do I choose SSR?
When selecting a Solid State Relay, consider: Current rating, as a general rule consider using the relay at no more than 70% of its rated current. Electrical environment,. i(In harsh electrical environments, consider a relay with an line voltage rating above the application line voltage.)
How is an SSR different from an electromechanical relay?
An electromechanical relay uses magnetic fields to provide isolation; an SSR, in contrast, achieves this goal generally through opto-coupling. As shown in Figure 2, in an SSR a small input voltage, typically 3 to 32 VDC, is used to illuminate an LED.
How are optical signals relayed in a SSR?
The photocouplers change electric signals into optical signals and relay the signals through space, thus fully isolating the in put and output sections while relaying the signals at high speed. Also, SSRs consist of electronic components with no mechanical contacts.
What kind of switching devices are used in SSRs?
High-voltage/current AC SSRs usually utilize SCRs or TRIACs as the switching device. These AC SSRs can be used to switch a 90 A, 480 Vrms load with only a 50 mA gate drive. Unlike the previously discussed switching devices, SCRs and TRIACs cannot be used for DC switching.
Where are SSRs with separate heat sinks located?
These relays are mainly installed in control panels. G3PJ, G3PA, G3PE, G3PH etc. SSRs with separate heat sinks 90 A or lower Separate installation of heat sinks allows the customers to select heat sinks to match the housings of the devices they use.