"If I told you half the things I've heard about this Jabba the Hutt, you'd probably short circuit." Since you’re here, these words said to R2D2 in the film Return of the Jedi are probably not the first time you’ve heard of a short circuit. A short circuit is one of the many issues electronic and electrical protection devices are designed to prevent.
Let’s talk basics. A protection device simply has two main functions: consistency in regulation, and protection of electrical and electronic circuits. At their most basic, circuit protection devices redirect a power supply into a separate circuit, using overcurrent protection. This allows the device to prevent damage to an existing circuit from excessive voltages and currents. Protection devices also may serve as a safeguard to remove the risk of fire hazard and electrocution. Now that we’re caught up on what exactly a protection device is, let’s cover the most common designs that you might come across and when you might encounter them.
2.Fuse
3. Poly Switch (Multifuse/Polyfuse)
4. Residual Current Circuit Breaker (RCCB/RCD)
6. Metal Oxide Variable Resistor/Voltage Dependent Resistor (VDR)
7. Gas Discharge Tube/Expulsion Lamps
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