Advantech BB-HESP4DR

DIN Rail Surge Protector

  • Three stages of protection on every data line: Gas discharge tube, Series resistor, Transient voltage suppressor
  • Protected signal ground connection
  • Rugged terminal block connections
  • Dedicated chassis ground lug
  • Wide operating Temperature
  • NEMA TS2


Model BB-HESP4DR meets 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). Five RS-422/485 signals on terminal blocks are supported with a clamping voltage of 6.8 Volts. The BB-HESP4DR is housed in a sturdy DIN rail mount case with a #10 grounding screw. In order to work properly, it is important to have a good connection between the #10 screw and a solid earth ground.

Part Number Interface Lines Protected Mounting
BB-HESP4DR RS-422/485 (5) RS-422/485 DIN Rail Mount
Serial Technology
Connectors, line 5 position terminal blocks
Connectors, equipment 5 position terminal blocks
Surge Suppression
Clamping Voltage - stage 1 72 VDC, minimum
108 VDC, maximum
Series Resistance - stage 2 2.7 Ohms
Clapming Voltage - stage 3 6.45 VDC, minimum
7.14 VDC, maximum
Clamping Time Less than 5 x10-9 seconds
Dimensions 3.55 x 7.88 x 10.53 cm (1.4 x 3.1 x 4.2 in)
Installation DIN rail mount
Weight 0.114 kg (4.02 oz)
Operating Temperature -40 to 80°C (-40 to 176°F)
Storage Temperature -40 to 85°C (-40 to 185°F)
Operating Humidity 0 to 95% Non-condensing
Approvals / Certifications - 485HESP
FCC Part 15, CISPR, EN 55022: 2010 + AC:2011 Class A Emissions
EN 61000-6-1: 2007 Generic Standards for Residential, Commercial and Light Industrial Environments
EN 61000-4-5: 2006 Electrical Surges

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