Gas Discharge Tubes (GDTs), also known as gas plasma arrestors, are circuit protection components designed to help limit the effects of transient overvoltage events. They operate by using an enclosed gas medium that transitions into a conductive state when a surge condition occurs, creating a temporary low-impedance path to divert excess energy away from sensitive circuitry.
Within the Circuit Protection category, GDTs are commonly recognized for their role as surge diversion elements and are often used as part of a coordinated protection strategy alongside other protective devices.
- Primary function: Transient surge diversion and overvoltage clamping through gas ionization
- Operating principle: Switch-like behavior that changes from high resistance to conduction during a surge, then returns to a non-conductive state afterward
- General characteristics: Electrically isolating under normal conditions and conductive only during overvoltage events
