 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.
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Network Rail Certification
All the products on this page have Network Rail Certificates of Acceptance, allowing them to be used on Network Rail infrastructure.
Installation
Connect in series with the datalink either near where it enters the trackside location cabinet or the equipment room.
ESP SSI/120AC and ESP SSI/140AC
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.
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