SURGE Series: Lightning and Transient Protectors



Wiring, particularly long horizontal wiring, can convert transient electrical fields to destructive voltages at sensors and data logger terminals. Transient protection equipment can be used to divert these transients to ground, increasing installed system reliability.

The SURGE Series of transient protectors consist of multi-stage devices which includes three terminal gas discharge tubes, thyristor crowbar devices, and coordinating resistors. They are 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. The protector is housed in a NEMA-4X enclosure or in a compact T35 DIN-rail housing with screw-terminal input/output and ground connection through the DIN rail, simplifying connections, and facilitating good signal practices: i.e. labeling, shielding, and routing outside cables away from protected lines.


Diverts transient electrical fields in wiring to ground; increasing installed system reliability.


  • Protects against high-speed (100 volts per microsecond) transients of up to 20,000 amps.
  • Compatible with most devices, including vibrating wire sensors, data loggers, 4-20 mA transmitters and other DC-powered sensors.
  • Maximum transient current per line (1 event, 8/20µs) of 20,000 Amps.
  • Minimum conduction threshold voltage of 58 Volts.
  • Peak pass-through voltage (common or normal mode) of 77 Volts.
  • Maximum leakage current of 5 Microamps.
  • Hold current of 150 Milliamps.
  • Self-resetting for uninterrupted operation after transient has been completed.