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Electronic Systems Protection furse

Protectors For Rail Applications


Furse Lightning Barrier ESP SSI/M


Network Rail approved protectors for SSI mains power and data links.
For single phase mains power supplies of 90–150 volts, use the ESP SSI/120AC (formerly ESP 120X).
For single phase mains power supplies of 90–165 volts, use the ESP SSI/140AC (formerly S065).
For SSI data links, use the ESP SSI/B base unit with the ESP SSI/M protection module.

Application

To prevent transient overvoltage damage to Solid State Interlocking (SSI) systems, protectors should be fitted in trackside cabinets and equipment rooms, on both the data link and the mains power lines.

Features and benefits

Accepted for use on Network Rail infrastructure. NRS PADS references: ESP
SSI/M - 086/047066; ESP SSI/B - 086/047067; ESP SSI/120AC - 086/047058
and ESP SSI/140AC - 086/047059.
Very low let-through voltage between all sets of conductors (ESP SSI/120AC and ESP SSI/140AC) and all signal lines (ESP SSI/M).
Provide repeated protection in lightning intense environments.
ESP SSI/B modified base unit can be permanently wired into the system.
ESP SSI/M plug-in protection module can be replaced without interfering with the operation of the system.
ESP SSI/B incorporates a 100Q terminating resistance that can be connected if required.
ESP SSI/B can be flat mounted, or a built-in DIN rail foot allows simple clip-on mounting to top-hat or G DIN rails.
ESP SSI/120AC and ESP SSI/140AC are a compact size for easy installation in trackside cabinets and control rooms.
ESP SSI/120AC and ESP SSI/140AC have three way visual indication of protector status and advanced pre-failure warning.
Maintenance free.

Furse Trackside Signalling Equipment

 

Network Rail Certification

All the products on this page have Network Rail Certificates of Acceptance, allowing them to be used on Network Rail infrastructure.

Furse Overvoltage Protectors

Installation

Connect in series with the datalink either near where it enters the trackside location cabinet or the equipment room.

Installation Illustration

Module Orientation Illustration

Install in parallel, within the trackside cabinet or equipment room. The protector should be installed on the load side of the fuses, at the secondary side of the step-down transformer.

Connect, with very short leads, to phase (BX), neutral (NX or CNX) and earth. SSI supplies are generally under 100A, but if they exceed this level, the phase/live connecting leads should be fused.

Trackside Installation Illustration

 


Electrical Specification

  ESP SSI/M
Maximum signal voltage' 7V
Maximum common mode stand-off voltage 90Vrms
Current rating 100mA
In-line resistance 4.5ohms
Leakage
(Line to line impedance)
(Line to earth impedance)		 1ohm
Differential Bandwidth (50ohm system) 10MHz

ESP SSI/B
This is a modified 11 pin `relay type' socket containing a 10052 ±5% wire-wound 2.5W resistor connected between terminals 8 and 9. Internal links between terminals 2 & 3, 9 & 10, and 1 & 11.

     
  ESP SSI/120AC ESP SSI/140AC
Nominal voltage (RMS) 120V 140V
Working voltage (RMS) 90-150V 90-165V
Frequency range 40-60Hz 40-60Hz
Current rating (supply) Direct connection to supplies up to 100A. Connection via series fuses to supplies greater than 100A.
See installation instructions.
Leakage current (to earth) <60µA <60µA
Indicator circuit current <10mA <10mA
Volt free Contact*
- Current Rating
- Nominal Voltage (RMS 		Screw Terminal
200mA
250V
Screw Terminal
200mA
250V

Transient Specification

  ESP SSI/M
Transverse (Differential) `let-through' voltage' 15V
Common mode `let-through' voltage' 250V

  ESP SSI/120AC ESP SSI/140AC
Let-through voltage (all conductors)'
Let-through voltage (all conductors)'
6kV 1.2/50µs open circuit voltage, 3kA 8/20µs short circuit current to:
BS 6651:1999 Appendix C, Cats C-Low & B-High
IEEE C62.41-20022 Location Cats C1 & B3
AS 1768-1991 Appendix B, Cat B
UL1449 mains wire-in
400V 500V

Maximum surge current³
- between any two conductors
- total unit to earth

    

Mechanical Specification

  ESP SSI/M ESP SSI/B
Temperature Range -25 to +70°C -25 to+70°C
Connection Type - Screw Terminal
Fixing Connection
- Flat Mount
- Top Hat Din Rail Mount
- G Din Rail Mount 		-

- Two M4 Fixing holes with 35mm centres
- An integral clip
- Two mounting clips with screws

Max Load - 10A, 250V
Weight
-unit
-packaged per 50
0.065kg
3.25kg
0.075kg
3.9kg
dimensions image

  ESP SSI/120AC ESP SSI/140AC
Temperature range -40 to +70°C -40 to +70°C
Connection type Screw terminal Screw terminal
Conductor size 16mm' 16mm'
Earth connection Screw terminal Screw terminal
Volt free contact Connect via screw terminal with conductor up to 2.5mm' (stranded)
weight
- unit
- packaged 		0.5kg
0.6kg		 0.5kg
0.6kg
Dimensions image