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Relays are used to protect a circuit from a high voltage that exceeds the value of the board’s max input/output. There are different types of relays that can either create contacts, break contacts or even a combination of the two. Some examples of relay variants are solid state relays, reed relays and control relays.
Relays
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DC 10-60V 20A 1200W PWM Motor Speed Control RegulatorZAR 98.90 ZAR 86.00
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L7815CV Linear Voltage Regulator 1.5A, 15V 3-Pin TO-220ZAR 16.93 ZAR 14.72
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MB102 Micro USB Interface Breadboard Power Supply ModuleZAR 19.56 ZAR 17.01