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Electronic Systems Protection furse
ESP LA/LB series Protectors for Computer Communications

Use on lines running within buildings.
Use to protect PCs and other computer equipment.
Use to protect systems using 9, 15 or 25 pins.
Suitable for equipment using "D" connectors - DB-9, DB-15 and DB-25.
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 or ESP LB-15/15

For coaxial Ethernet cables running external to the building use the ESP Thin/ThickNet models. For Cat 3, 4 or 5 cabling with RJ45 connections (running external to the building) use the ESP Net-100. For local protection of Cat 3, 4 or 5 cabling with RJ45 connections running within a building use the ESP LN series.

Application

Use on cables running within a building to protect equipment locally from transients induced onto data cables from the magnetic field caused by a lightning strike.

Features and benefits

Let-through voltage below equipment susceptibility levels.

Negligible in-line resistance.

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 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.

ESP LA/LB series

Male/female connectors allow easy plug-in installation without rewiring.

Earthed via shell and supplementary earth strap.

Installation

Simple plug-in connection to the communication port, between the equipment to be protected and its incoming data cable. Make suitable attachement to earth.

Technical Note

ESP LA... and ESP LB... protectors are designed only for use on cables running within a building, and therefore will not be able to handle the higher level transients that occur when lines between buildings are protected. They should not be used in such an application. 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.

PDF

ESP LA LB Brochure
Electrical Specification

ESP LA-5/25 ESP LA-25/25 ESP LA-9/9 ESP LB-9/9 ESP LA-15/15 ESP LB-15/15
Nominal voltage
(note 1) 		23.1V 23.1V 23.1V 5.8V 15.3V 6.4V
Maximum working voltage
(note 2) 		25.7V 25.7V 25.7V 6.4V 17.1V 7.13V
Capacitance <500pf <500pf <500pf <2000pf <50pf <50pf
Current rating 300mA 300mA 300mA 300mA 300mA 300mA
In-line resistance (ohms) approx zero approx zero approx zero approx zero approx zero approx zero
1 Nominal voltage (DC or AC peak) measured at 5µA (ESP LA-5/25, ESP LA-9/9, ESP LA-25/25, ESP LA-15/15), 0.5mA (ESP LB-15/15) and 1mA (ESP LB-9/9).
2 Maximum working voltage (DC or AC peak) measured at 1mA leakage (ESP LA-5/25, ESP LA-9/9, ESP LA-25/25, ESP LA-15/15) and 10mA (ESP LB-15/15 and ESP LB-9/9)
Transient Specification

ESP LA-5/25 ESP LA-25/25 ESP LA-9/9 ESP LB-9/9 ESP LA-15/15 ESP LB-15/15
Let-through voltage (note 1)
1.5kV, 10/700µs test to:
BS 6651:1999 Appendix C, Cat C-Low
ITU (formely CCITT) IX K17 		37.5V 37.5V 37.5V 10.5V 28.5V 14.6V
Protection provided Pins 1,2,3, 7 and 20 to earth/shell
(note 2) 		Pins 1 through 25 to earth/shell
(note 2) 		Pins 1 through 9 to earth/shell
(note 2) 		Pins 1 through 9 to earth/shell
(note 2) 		Pins 1 through 15 to earth and each other
(note 2) 		Pins 1 through 15 to earth and each other
(note 2)
Maximum surge current (note 3) 200A 200A 200A 300A 350A 700A
1 The maximum transient voltage let-through the protector throughout the test (+/-10%). Response time <10ns.
2 Pin 1 connected to earth/shell.
3 Tested with 8/20µs waveshape to ITU (formely CCITT), BS 6651:1999 Appendix C.
Mechanical Specification

ESP LA-5/25 ESP LA-25/25 ESP LA-9/9 ESP LB-9/9 ESP LA-15/15 ESP LB-15/15
Temperature range -25°C to +70°C -25°C to +70°C -25°C to +70°C -25°C to +70°C -25°C to +70°C -25°C to +70°C
Connection type DB-25 male-female DB-25 male-female DB-9 male-female DB-9 male-female DB-15 male-female DB-15 male-female
Earth connection Shell or 150mm earth lead (supplied) Shell or 150mm earth lead (supplied) Shell or 150mm earth lead (supplied) Shell or 150mm earth lead (supplied) Shell or 150mm earth lead (supplied) Shell or 150mm earth lead (supplied)
Weight
unit
packaged
50g
70g
50g
70g
40g
50g
40g
50g
50g
60g
50g
60g

Dimensions Dimensions