Furse Total Solution to Earthing & Lightning Protection

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Furse, Wilford Road, Nottingham, NG2 1EB • Tel: +44 (0)115 964 3700 • Email: • Web:
ESP LA & LB Series
ESP LA-5/25 installed on the parallel port
of a PC, protecting the printer connection
For cabling up to Cat-6 with RJ45 connections (running external to the building) and local protection for up to Cat-6 with RJ45 connections,
(running within a building) products are also available. For protection of legacy coaxial Ethernet networks, please contact us for details of our
ESP ThinNet and ESP ThickNet protectors.
Technical note
ESP LA… and ESP LB…
protectors are designed only for
use on cables running within a
building (typically LPZ 2) to
offer local protection to
equipment. They therefore will
not be able to handle the
higher level transients that
occur when lines between
buildings are protected. ESP
LA... and ESP LB... protectors
should not be used in such an
application (up to LPZ 0 A)
where high energy ESP
lightning barriers (such as ESP E
Series) should be employed. If
they are used in lines between
buildings, there is a high risk of
the protector being overloaded
and destroyed during transient
activity. Connected equipment
will, in most cases, still be
protected, but there is a small
risk that equipment will suffer
damage in such circumstances.
Let-through voltage below equipment susceptibility levels
Negligible in-line resistance
Suitable for equipment using “D” connectors - DB-9, DB-15 and DB-25
ESP LA-5/25 protects pins 1, 2, 3, 7 & 20 to earth/shell. Note pin 1 is
connected to earth
ESP LA-25/25 and ESP LB-25/25 protects all pins. Note pin 1 is connected
to earth/shell
ESP LA-9/9, ESP LB-9/9, ESP LA-15/15 and ESP LB-15/15 protect all pins
Sturdy plastic housing
Male/female connectors allow easy plug-in installation without rewiring
Earthed via shell and supplementary earth strap
Features and benefits
Use on cables running within a building to protect equipment locally from
transients induced on to data cables from the magnetic field caused by a
lightning strike.
For Asynchronous RS 232 systems, use ESP LA-5/25
For RS 232 systems, use ESP LA-25/25, ESP LA-9/9 or ESP LA-15/15
For RS 422, RS 423 and RS 485 systems, use ESP LB-9/9, ESP LB-15/15 or
ESP LB-25/25
Application
Combined Category C, B tested protector (to BS EN 61643) suitable
to protect PCs and other computer equipment on systems using
9, 15 or 25 pins. For use on lines running within buildings at
boundaries up to LPZ 2 through to LPZ 3 to protect sensitive
electronic equipment.
Simple plug-in connection to the
communication port, between the
equipment to be protected and its
incoming data cable. Make
suitable attachment to earth.
Installation