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B&B ELECTRONICS
RS-422 & RS-485 High Energy Surge Protector
Model 422HESP
The Model 422HESP is designed to help protect against
lightning strikes, power surges, and other types of voltage
disturbances. Five RS-422/485 signals on terminal blocks are
supported with a clamping voltage of approximately 6.8 volts.
The 422HESP offers three stages of protection starting with a gas
discharge tube followed by a series resistor and finally a
Transient Voltage Suppresser (TVS). In order for a surge
protector to work properly it is important to have a good
connection to earth ground. The 422HESP offers two terminal
posts and two metal mounting brackets which provide a good
ground connection for the user. The 442HESP has been tested
to two specifications at 6 kilovolts, 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”.
To ensure the best protection of your equipment some simple
connection guidelines should be followed.
Connections
1. The 422HESP should be located as close as possible to the equipment being protected.
2. A good ground connection must be made between the 422HESP and earth ground. This can be done
with the two terminal posts on the top of the unit or the two mounting brackets.
3. The earth ground connection should be kept as short as possible for best performance. As a
recommendation a minimum of 10 gauge copper wire at no more than 3 feet should be used. If it is
not possible to achieve the short distance a braided cable made specifically for grounding purposes
should be used.
4. The chassis ground of the equipment should be connected to the buildings 3 prong plug ground.
Specifications
*
Clamping Voltage, stage one:
*
Series Resistance, stage two:
*
Clamping Voltage, stage three:
*
Clamping Time:
*
Connectors:
*
Dimensions:
*
Weight:
Min. 72 VDC, Max.108 VDC
2.7 Ohms
Min. 6.45V, Max 7.14 V
-9
Less than 5 x10 seconds
5 Position Terminal Blocks
Approximately 11.4 x 8.4 x 4.6 cm (4.5”L X 3.3”W X 1.8”H)
Approximately .19 kg (6.7 ounces)
DECLARATION OF CONFORMITY
Manufacturer’s Name:
B&B Electronics Manufacturing Company
P.O. Box 1040
707 Dayton Road
Ottawa, IL 61350 USA
422HESP
RS-422/485 High Energy Surge Protector
Light industrial ITE equipment
EN 50082-1 (IEC 801-2, IEC 801-3, IEC 801-4)
EN 50081-1 (EN 55022, IEC 1000-4-2)
EN 61000 (-4-2, -4-3, -4-4, -4-5, -4-6, -4-8, -4-11)
ENV 50204
EN 55024
PRODUCT INFORMATION
Manufacturer’s Address:
Model Numbers:
Description:
Type:
Standards:
Application of Council Directive: 89/336/EEC
Robert M. Paratore, Director of Engineering
www.bb-elec.com
orders@bb-elec.com
support@bb-elec.com
International Office:
707 Dayton Road PO Box 1040 Ottawa, IL 61350 USA 815-433-5100 Fax 433-5104
European Office:
Westlink Commercial Park Oranmore Co. Galway Ireland +353 91 792444 Fax +353 91 792445
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