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Surge Protection

A surge protector is an electrical device that is used to protect equipment against power surges and voltage spikes while blocking voltage over a safe threshold (approximately 120 V). When a threshold is over 120V, a surge protector shorts to ground voltage or blocks the voltage. Without a surge protector, anything higher than 120V can create component issues, such as permanent damage, reduced lifespan of internal devices, burned wires and data loss. 


A surge protector is usually installed in communications structures, process control systems, power distribution panels or other substantial industrialized systems. Smaller versions are typically installed in electrical service entrances located office buildings and residences.


A voltage spike is a short upsurge of voltage intensity that occurs when a surge sustains longer voltage intensity. A power strip, which is sometimes mistaken for a surge protector, uses a male electrical plug outlet and may or may not have a built-in surge protector. Most power strips are clearly labeled. 


A common misconception is that surge protectors always protect against lightning, which can create sudden and increased electrical pressure (thousands of volts or greater). Generally, a surge protector has a slight operational delay, but a surge protector fuse can blow during a lightning surge and cut off all current. 


Surge protector components and features include: 

  • An iron core transformer transfers alternating current (AC) power but cannot absorb sudden surges. 
  • A zener diode protects against common circuit spikes and is sometimes combined with a transient voltage suppression diode. 
  • If a circuit breaker is out or blows a fuse, a surge protector provides internal protection and protects against device and exterior surges.
  • Uninterruptible power supply takes in spikes using a low pass filter and allows external power beyond the battery, which supplies uninterrupted power.
  • A metal oxide varistor (MOV) is thermal fused and limits voltage three to four times that of a regular current. Parallel MOV connections expand life expectancy and increase current capacity. If exposed to many large transients or numerous small transients, MOVs can self-destruct.