SALTEK is an expert in surge protective devices (SPD) and Voltage Limiting Devices (VLD) protecting infrastructure in all industrial areas including electric railway, tramway or metro infrastructure. 25 years of experience in our own development and manufacturing and wide application knowledge make us leaders in the field of protection against lightning and industrial pulse overvoltage.
Railway Voltage limiting devices (VLD) are our main products to protect people and animals against touch voltage electric shock and maintain electrical/electronic equipment in railway infrastructure in reliable operation condition. They ensure the safety of people and staff, reliability of rail transport systems and protect technologies against damage caused by lightning surges or operational over voltages, which can arise also during normal operation of trains, metro, tramways, etc. We offer voltage limiting devices in class 1, class 2.2 and class 4.1 or 4.2 according to EN 50526-2 ed.2 standard. Protection degree comply with the classification VLD-F (protection during failure) and/or VLD-O (protection during normal operation) according to EN 50122-1 ed.2 standard.
SCG series voltage limiting devices are designed primarily for the protection of persons and technologies in the event of a failure of the overhead contact line. By temporarily or permanently connecting endangered conductive parts of railway infrastructure with return path when overvoltage is detected, it will automatically disconnect the affected section in the respective substation. When passing the high short-circuit current a permanent electrical bypass of SCG terminals is achieved by patented integrated short-circuit switch. Integrated surge arrester eliminates also high charge lightning impulses up to 100kA.
BVL series voltage limiting devices with integrated A2 surge arresters are reliable, robust (but lightweight = 3.5kg) protectors for electric railways, able to operate repeatedly with high energy hazardous pulses (up to 11 Mega A2s). Combining powerful antiparallel thyristors with a fast A2 surge arrester, they are able to work in any electric traction rail system (DC or AC) and ensure personal safety and technology protection in both VLD-O and VLD-F modes. The use of SALTEK VLDs makes it possible to effectively ensure the safety of persons and at the same time measures to minimize the influence of stray currents in DC traction. Smart design and use of modern materials mean simple and fast assembly on railway track (UTn = 120V) or in workshops (UTn = 45V or 60V) with excellent operating parameters.
Our type 4.2 (or 4.3 for workshops) voltage limiting devices are the top SALTEK surge protective devices for railways. They are designed to operate with very high long-lasting currents and energies in the event of breakdown or unwanted operating condition of electric railways infrastructure (DC electric traction, metro, trams, etc.). They ensure the safety of persons and technologies by limiting non-permissible touch voltages, stray currents or lightning pulses by temporary equipotential bonding of protected parts of the railway infrastructure (DC and also AC traction). The combination of varistors, electronically controlled power thyristors and contactors ensures excellent short- and long-term ability to dissipate unwanted energy from lightning strikes or caused by overhead line breakdowns or during rolling stock operation. Processor-controlled VLD provides fast and efficient protection against unwanted pulses and surges, monitoring and remote reporting of the protected node status, as well as local and remote control of the protector function. This type device has been produced customized based on customer requests.
The communication infrastructure must be protected against overvoltage surges to ensure its reliability, which is essential for the safe and smooth operation of the railways. SALTEK offers a complete portfolio of surge protective devices to protect AC or DC power inputs, radio receivers and transmitters (coaxial SPDs), Ethernet data lines (incl. PoE), special equipment for remote electronic tilting of antenna, RS-485 lines, etc. of newest LTE (4G / 5G) and older GSM-R systems and other telecommunication grids.
Power supply lines of railway electric or electronic systems can be a gateway for dangerous lightning or industrial pulses and must be protected. SALTEK offers a wide range of surge protective devices and surge arresters for all types of AC power supplies (TN-S, TN-C-S, TN-C, TT, IT) as well as DC ones. High pulse current values for heavy duty applications, low voltage protection levels and fast response for efficient protection, remote status indication and easily removable modules for easy installation and service are just few of the benefits of SALTEK surge protective devices. In addition to the type 1, 2 and 3 protection series, we also offer special combined SPD T1 + 2 “FLP MAXI” which are an affordable solution for most applications.
Most of the control and signalling infrastructure of railways is interconnected by cables through a lot of digital and analogue ports, which must be protected against overvoltage surges. This can be done by selecting the appropriate SPD to protect Ethernet and data digital lines, analogue signalling and control circuits, various sensors, video cameras (coaxial or IP) and other electronic railway infrastructure elements.
Last, but not least, Saltek experts are always ready to help you choose and apply the surge protective devices (for free, of course). This can make solving problems or projects related to your electrical railways infrastructure much easier.
SALTEK can now look back on 25 years of a successful history of development, expertise, manufacture and sales of surge protective devices.
The expansion of SALTEK facilities includes a three-floor building with production areas, sanitary installations and a warehouse.
Use the form opposite to get in touch with SALTEK directly to discuss any requirements you might have.