Advantech BB-422HESP

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Advantech BB-422HESP


RS-422 Surge Protector



These three-stage surge protectors meet IEEE 1000-4-5: 1995 and IEEE C62.41-1991 recognized standards for premium surge protectors. It protects against lightning strikes, power surges, and other types of voltage disturbances with three stages of protection for each supported line: a gas discharge tube followed by a series resistor and finally a Transient Voltage Suppresser (TVS). Three RS-422/485 signals on terminal blocks are supported with a clamping voltage of approximately 6.8 Volts.

These surge protectors housed in a tough metal, panel mount case with a protected signal ground connection and dedicated chassis ground lug. In order to work properly, it is important to have a good connection between the #10 screws and a solid earth ground.


Further Information

Surge Protection Standards

IEC 1000-4-5: 1995 “Surge Immunity Test” and IEEE C62.41-1991 “IEEE Recommended Practice on Surge Voltages in Low-Voltage AC Power Circuits” are the recognized standards for surge protection. Advantech B+B SmartWorx’ heavy duty surge protectors have been tested at 6 kV to meet these two specifications.

Terminal Block

RS-422 RS-485

Temperature (Storage)
-40~85°C (40~185 °F)

0 ~ 95%, non-condensing

Temperature (Operating)
0 ~ 70° C (32 ~ 158° F)


PDF description Advantech BB-422HESP Datasheet (363.0 kB)

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