Epoxy Products
Third Rail Insulator
A third rail insulator carries the conductor rail that powers a metro or light-rail vehicle. It has to hold that rail at a fixed height and gauge, keep it electrically separated from the track structure, and survive years of vibration, weather and trackside grime without being touched.
Indisol casts third rail insulators in cycloaliphatic epoxy, the outdoor resin family, so the same part works in open air and in tunnel. Creepage distance and withstand voltage are dimensioned to the system voltage, up to 1 500 V DC.
The insulator is designed to mount to your existing track structure, rather than the track structure being adapted to the insulator. Support spacing is set with you, against the mechanical load and the deflection your installation allows.
For tunnels and enclosed stations: the resin system meets EN 45545-2 for fire and smoke behaviour, and part-level test reports are available on request.
Cast epoxy third rail insulators
Which epoxy insulator do you need?
A third rail insulator is one member of a family. If the part you are specifying does something else, go straight to the right family.
What the insulator has to do
Three duties at once, and they pull against each other. The design is the compromise.
Fire and smoke, where it matters most
In a tunnel or an enclosed station, the fire and smoke classification of every component in the tunnel envelope is part of the safety case, not a specification detail. An insulator that is fine trackside in the open can be the item that holds up an approval underground.
These insulators are cast in a cycloaliphatic epoxy system that meets the EN 45545-2 requirements for fire and smoke behaviour in railway rolling stock and infrastructure. Part-level test reports are available on request — ask for them with the enquiry and they go into your file rather than being chased later.
It fits your track, not the other way round
Because the part is cast rather than fired or machined, the geometry is chosen by the designer. Fixing centres, rail interface, ribs and creepage profile are moulded in one piece, and metal inserts are encapsulated inside the resin instead of bolted on afterwards — no fasteners sitting in the insulating path.
In practice that means an insulator can be designed to the holes and brackets already in your track structure. Send the interface and we work to it.
How it is made
Most of what can go wrong electrically goes wrong during casting, which is why the process matters more than the datasheet.
Common questions
Send us the track and the duty. We design the insulator to it.
Every part we cast is engineered to a specification rather than selected from a catalogue, so you get a design proposal back, not a page number. You do not need all of the detail to start.
Request a quotation → or see how we cast them
