DIN-Rail Power Supplies for Railway Applications

PULS DIN-Rail power supplies are authorised by NRAP for use on railway infrastructure for which Network Rail is the manager under ROGS regulations

PULS Power the specialist manufacturer of high reliability DIN-Rail power supplies provides a range of reliable, efficient and robust DIN-Rail power supplies specifically for railway applications. Using technology based on designs already proven in tens of thousands of industrial applications worldwide PULS power supplies also feature DIN-Rail mounting to enable simple integration into cabinets and enclosures both on board rolling stock and trackside.

Performance requirements for electronic systems in railway applications are challenging on several fronts; failures cannot be tolerated, even under extreme mechanical stress over an extended temperature range. Further, the input voltages in railways differ from those experienced in industrial applications ruling out the use of standard commercial grade devices. PULS railway approved power supplies are ideally suited to the latest infrastructure projects such as HS2 and extensions to underground rail networks.

PULS railway specific power supplies may be used in a wide range of applications within the train and on the track including, central power, air conditioning, communication and infotainment systems, signaling technology and train protection systems. PULS products are deployed in major infrastructure investments such as the SBB (Swiss Federal Railways) where power supplies have been installed along the railway track in some 800 electrical cabinets all over Switzerland for the control of power lines for the trains. Critical to this contract was the ability of PULS to deliver and support the chosen product types for many years after design-in, while also delivering cost savings over the existing installation.

PULS continue to innovate and have recently introduced the new FIEPOS range of rugged IP67 rated power supplies which need no protective enclosure. These power supplies provide an intelligent distributed power solution and may be mounted in close proximity to, or actually on, the load. This reduces installation costs and simplifies commissioning while introducing increased flexibility and the ability to easily reconfigure systems.

PULS railway range of power supplies provide one hundred per cent greater mains failure bridging time than required by the railway standard EN 50155 (S2), are weather resistant with all PCBs having conformal coating as standard and are completely convection cooled simplifying installation, further increasing reliability and minimising system noise.

Fully EN 50155 certified PULS DIN-Rail power supplies are classified according to T3, TX, C2 and S2 for use on rolling stock. They also meet EN 61373 for shock and vibration, EN 50121-3-2 for EMC requirements and EN 45545-2 for fire protection on a railway vehicle according to hazard level HL3.

Five models from the PULS QS Series have been awarded full acceptance certification by Network Rail for use with signaling equipment in environments not exceeding 95 per cent relative humidity. The Network Rail product acceptance process is required for products intended for use on or about rail infrastructure and ensures they are safe, reliable, fit for purpose, compatible and do not export unacceptable risks to the infrastructure. Only accepted products, (except those allowed by NR/ L2/RSE/100/05) may be used on rail infrastructure.

Three of the Network Rail approved PULS DIN-Rail power supplies feature the advanced PULS ‘Hiccupplus’ overload protection mode. These employ technology innovations to overcome the problems associated with early hiccup protection circuits which were considered too sensitive when used in conjunction with motors or loads that are equipped with large input capacity, running power supplies in parallel or battery charging. Th ese are the QS40.241 with a DC output of 24V/40A, and the QS20.481.C1 and QS20.241.C1 with outputs of 48V/10A and 24V/20A respectively and feature conformal coating.

The two other approved DIN-Rail power supplies are the QS10.481.C1 providing an output of 48V/5A and the QS5.241.A1 rated at 24V/5A, which are also conformal coated.

PULS DIN-Rail power supplies offer system designers and installers’ uncomplicated assembly and permits flexible positioning of the devices. Optional wall and side mounting brackets offer alternative mounting options. Spring-clamp terminals provide shock and vibration resistance, making installation intuitive and facilitates simple wiring without tools.

Key features of the PULS QS Series of DIN-Rail power supplies include a wide input range from 100 to 240Vac, and a very wide operating temperature from -40⁰C to +70⁰C (depending on model) without derating (+60⁰C to +70⁰C with derating), typical efficiency greater than 94 per cent and operation in environments with up to 95 per cent maximum relative humidity. All models have a nominal 110Vdc input with a wide voltage fluctuation tolerance of -30 to +40 per cent and are available with an output voltage range from 24 to 28VDC with power ratings of 100, 200 and 400W.

For more information on PULS DIN-Rail railway power supplies, get in touch with them via the contact information below.

Tel: 01525 841 001

Email: sales@puls.co.uk

Visit: www.pulspower.com