Product Overview
Getting Started
1
Model HESP4DR is designed to help protect against
lightning strikes, power surges, and other types of voltage
disturbances to components on a DIN rail.
Five RS-422/485 signals on terminal blocks are supported
with a clamping voltage of approximately 6.8 Volts.
The HESP4DR offers three stages of protection starting
with a gas discharge tube, followed by a series resistor and,
finally, a Transient Voltage Suppressor (TVS).
Terminal Block
Connections
Earth Ground Connection
2
HESP4DR - SPECIFICATIONS
Clamping Voltage - Stage 1
72 VDC min., 108VDC max.
Series Resistance - Stage 2
2.7 Ohms
Clamping Voltage - Stage 3
6.45 V min., 7.14 V max.
Clamping Time
Less than 5x10
-9
Seconds
Data Line Connectors
Terminal blocks
Temperature
-40 to 80 °C (operating)
MTBF
862813 hours
Dedicated
Chassis
Ground Lug
In order for a surge protector to work properly, it is important
to have a good connection to earth ground. The HESP4DR
has a #10 grounding screw, which provides a solid ground
connection for the user.
To ensure the best protection of your equipment, some
simple connection guidelines should be followed:
1. The HESP4DR should be located as close as possible
to the equipment being protected.
2. A good ground connection must be made between the
HESP4DR and earth ground. This can be done with the
#10 grounding screw.
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 of no more than
Terminal Block
Connections
3-Stage Protection on Data Lines:
1. Gas discharge tube
2. Series resistor
3. Transient voltage suppressor
3 feet (0.9 m) 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 building’s 3-prong plug ground.
