Plus, the SCR is unidirectional while TRIAC is multidirectional. What’s the difference between both electrical components? With the silicon, you need a positive voltage to trigger it while the TRIAC requires either a positive or negative voltage. So, they only stop conduction when there’s a holding current (the main current). And it relates to the TRIAC because they both allow voltage flow.Īlso, they both conduct current continuously, especially if the gate current stops. That is, a small current and supply voltage can regulate a way bigger leakage current and voltage. You can also define the TRIAC as a semiconductor device with three terminals and four layers that control AC variable power.Īn example of a Semiconductor device (a microchip with a die)Īside from the acronym or term being a generic trademark, it’s also a subset of thyristors similar to the regular relay. And it can regulate the voltage in both directions when you activate it. In other words, the TRIAC is a three-terminal electronic component. That is, the TRI stands for triode while the AC means alternating current. TRIAC is an acronym that you can split into two. We’ll also touch down on the detailed explanation of TRIAC symbols, the TRIAC application, construction, and much more.Īre you ready? Let’s get down to business What is TRIAC? In this article, we’ll break things down by explaining what it is and how it works. If you’re new to this, you don’t have to worry. That said, the TRIAC symbol is another aspect worth looking into since it’s the circuit symbol that indicates bidirectional properties. Measure + to -, for example positive lead on G and negative lead on MT1.Do you deal with many power switching applications, or do you need an electrical device and PCB component that has a wide application? Then, the TRIAC is the ideal option. Reversing polarity of the measurement will change measured results.
NOTE: Resistances listed in Table 1 are not absolute and should only be used as a troubleshooting guideline.
- If the resistance values are within the guidelines or after the Triac has been replaced, reconnect the lead wires to their correct terminals.
- If any of the resistance values are outside of the guidelines shown in Table 1, the Triac should be replaced.
- Using an Ohmmeter check the terminal-to-terminal resistance as shown in Table 1.
- Mark and then disconnect the lead wires connected to the Triac.
-
Disconnect the instrument from its power source.To determine if a Triac is operating correctly, do the following: Applies To: Baths, Micro Baths, and Dry Well Calibratorsįailure of the Triac can cause heating circuits to behave abnormally.