lightning protectors for telephone and ISDN lines

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ESP KT1, ESP KT2, ESP K10T1, ESP K10T2 & ESP KE10

Suitable for use on ten line LSA-PLUS connection strips.
For PSTN and U interface ISDN lines use ESP KT1 and ESP K10T1.
For S/T interface ISDN lines use ESP KT2 and ESP K10T2.
Protect single lines with ESP KT1 or ESP KT2.
Protect all ten lines on a connection strip with ESP K10T1 or ESP K10T2.

For individual telephone lines and lines at unmanned sites the high performance ESP TN , ready-boxed derivative ESP TN/BX or ESP TN/2BX, or plug-in ESP TN/JP or ESP TN/RJ11 should be used.

Application

Use these units to protect PBX telephone exchanges, ISDN and other telecom equipment with LSA-PLUS connections. Install protectors on all lines that enter or leave each building (including extensions to other buildings).

Features and benefits

Low cost protection for large numbers of telephone lines.

Low let-through voltage reduces the transient voltage reaching equipment to a safe level.

Protection between all sets of conductors to close all transient paths to equipment.

Multiple strike protection, with the ability to protect against at least ten 5kA transients (test to ITU K20).

Quick and easy plug-in installation.

single line protectors installed on LSA-PLUS distribution strips via ESP KE10 earth bars

Protectors for telephone and ISDN lines wth LSA-PLUS connections

Colour of housing distinguishes electrically different protectors, to help avoid confusion when installed together on the same distribution frame.

At larger installations ESP K10T1/2 provide all in one protection for all ten lines on a standard LSA-PLUS distribution strip for extra quick and easy installation.

ESP KT1/2 allow you to protect only the lines you need.

Ridged finger holds make it easy to obtain a firm grip for installation or removal.

ESP K10T1 & ESP K10T2 installed on an LSA-PLUS distribution strip

Trouble free earthing via the ESP KE10 for the ESP KT1/2 (ESP K10T1/2 have an integral earth connection making the ESP KE10 unnecessary).

Straightforward installation instructions.

UK Oftel Approval NS/G/1235/W/100025.

5 year warranty.

ESP KT KT10T Brochure

Installation

Identify the lines requiring protection and plug-in the protector (ensuring the correct orientation) for a series connection. Plug ESP K10T1/2 directly into each connection strip requiring protection.

Installation of ESP K10T1/K10T2

ESP KT1/2 must be installed via the ESP KE10 earth bar. Clip an ESP KE10 on to the connection strip and plug an ESP KT1/2 in to each line on the strip that needs protecting.

installation of ESP KT1/KT

If the protectors' ratings are exceeded it will sacrifice itself and fail short circuit, taking the line out of commission - indicating it needs replacing and preventing subsequent transients from damaging equipment.

Electrical specification

	ESP KT1	ESP KT2	ESP K10T1	ESP K10T2
Maximum working voltage -line to earth -Line to line	190V 190V	58V 5V	190V 190V	58V 5V
Current rating (signal)	300mA	300mA	300mA	300mA
In-line resistance (± 10%)	4.4ohms	4.4ohms	4.4ohms	4.4ohms
Bandwidth (-3db 50ohm system)	>50MHz	>50MHz	>50MHz	>50MHz

1 Maximum working voltage (DC or AC peak) measured at 95µA for ESP KT1 and ESP K10T1 and at 5µA for ESP KT2 and ESP K10T2.
2 Post transient recovery voltage >80V.

Transient specification

	ESP KT1	ESP KT2	ESP K10T1	ESP K10T2
Let-through voltage¹ 5kV 10/700µs test to: BS6651:1999 Appendix C, Cat C-High ITU (formerly CCITT) IX K17 -Line to line -Line to earth	200V 200V	27V 80V	200V 200V	27V 80V
Maximum surge current² -per signal wire -per pair	5kA 10kA	5kA 10kA	5kA 10kA	5kA 10kA

1 The maximum transient voltage let-through the protector throughout the test (+/-10%), line to line & line to earth. Response time <10ns.
2 Tested with 8/20µs waveshape to ITU (formely CCITT), BS 6651:1999 Appendix C.

Mechanical specification

	ESP KT1, ESP KT2	ESP K10T1, ESPK10T2	ESP KE10
Temperature range	-25°C to +70°C	-25°C to +70°C	-
Connection type	LSA-PLUS 'disconnection' connection strips (BT part number 237A)
Earth connection	Via ESP KE10 earth bar	Via integral clip	-
Weight -unit -packaged	0.01kg 0.12kg (per 10)	0.10kg 0.12kg	0.01kg 0.10kg (per 10)
Dimensions

ESP KT KT10T Brochure