Used to divert transients to ground, increasing installed system reliability.
Wiring, particularly long horizontal wiring, can convert transient electrical fields to destructive voltages at sensors and data logger terminals.
The ELLP4501 transient protector is a multi-stage device which is capable of protecting against high speed (100 volts per microsecond) transients of up to 20,000 amps, letting only 77 volts through before clamping to 4 volts.