Schaefer

Rugged, Reliable Railway Power Conversion Product Capabilities

45 South Street , Hopkinton, MA 01748, United States of America



With over 40 years of power supply experience, Schaefer specialises in the design and manufacturing of power converters for the rail industry. Schaefer has a commanding knowledge in solutions for on-board and trackside heavy rail applications. Controlling its own design and manufacturing allows for ultimate flexibility in developing products with an endless combination of input and output voltages. Extra rugged construction ensures long life and reliable operation in even the most demanding applications, including on-board electronics, as well as other transit vehicles, mining vehicles and switches.

Railway power conversion products

Schaefer’s experience in power conversion for the railway industry results in the market place’s most feature-packed list of capabilities for optimised rail designs:

  • 36VDC, 37.5VDC, 74VDC or 110VDC
  • Ultra-wide input ranges handle extremes such as the 74VDC bus
  • Steady output power even during start-up or cranking conditions
  • Buck, boost or isolated topology
  • DC/DC, DC/AC, AC/DC or AC/AC designs
  • Custom solutions, typically with no NRE
  • Hermetically sealed solutions
  • Natural convection or water-cooled solutions
  • Extra rugged construction for the most demanding and harsh trackside and on-board environments
  • Redundant configurations for longer life operation in critical applications
  • Ultra-wide temperature ranges
  • Lightweight, high power density for smaller package designs
  • High efficiency for lower cost of ownership

Power converters for the railway industry

Schaefer has developed numerous power converter designs to satisfy the power challenges of the rail industry. Often Schaefer can make minimal modifications to one of its standard products in order to meet a customer’s unique requirements. For more complex applications, Schaefer offers in-house design capability with quick-turn engineering results with minimal NRE charges. Schaefer welcomes the opportunity for small-scale production quantities whether it is for a modified, standard or full custom design.

Power converter solutions for heavy rail

Problem: onboard systems must be operational during engine cranking when battery voltage drops below 20VDC.

Schaefer solution: wide DC input allows for full power during cranking or at system start-up.

Problem: locomotives in yard need to be moved for service or put into operation.

Schaefer solution: dead start DC/DC energises batteries, allowing for immediate start-up of locomotive in yard.

AC/DC power supplies, DC/DC converters and battery chargers

Schaefer’s broad range of standard products, with power ratings from 50W to 22kW, are suitable for any application where robust design and high reliability are required. Schaefer offers the industry’s most complete range of input and output voltages, with a selection of package style and mounting configurations.

Schaefer’s standard products feature:

  • Ultra-rugged design
  • Railway-grade construction
  • Suitability for harsh environments
  • High reliability
  • Conformal coating

Fully compliant custom power converters

Schaefer’s custom power solutions feature power supplies that are designed to meet rail-specific standards, including EN50155, EN50121-3-2, RIA 12, IEC571, as well as IEC61373 shock/vibration and RIA 13 and RIA 20 mechanical standards. Schaefer can also design to other standards upon request.

Development guidelines, arduous selection of industrial-grade components, as well as many test procedures during all steps of production, ensure the highest product quality. In addition, Schaefer follows ISO 9001 guidelines, guaranteeing continuous improvement of the product and process, especially within the turbulent market of electronic components.

From the initial concept, through the entire sales channel, each customer’s requirements are analysed by a group of leading power supply professionals, resulting in a successful individualized concept. Schaefer’s production and development departments work in concert with each other, furthering optimized progress during all project stages. It provides tailor-made solutions for both large and small quantity requirements.

Power Conversion Systems

SCHAEFER is wholly owned and privately run by a qualified and experienced team of experts. SCHAEFER has grown in a controlled and sustainable manner to a dedicated workforce of over 200 people who oversee the entire concept, design, control and manufacture of all of the SCHAEFER product portfolio.

Schaefer Introduce Low Cost and Compact 5kW Pure Sine Wave Inverter

Schaefer introduces the AEP-5000 series of 5,000W, rugged, high-efficiency, pure sine wave inverters. The 'clean' pure sine wave output of the AEP-5000 series with less than 3% total harmonic distortion is ideal for powering sensitive loads and for improving AC equipment performance.

Pure Sine Wave Inverter: 3kVA in 1U Rack with Optional SNMP Interface

Schaefer's AEP-A3000R Series of highly efficient, pure sign wave inverters provide 3kVA of power in a compact 1U rack design and are available in standard input configurations of 24VDC and 48VDC. Outputs are regulated to +/- 3% or better. A built-in, 4-6ms automatic bypass switch allows f

Rugged Transit Power Converter from Schaefer Converts 600/750VDC to 24VDC

Schaefer, a manufacturer of robust and reliable power supplies, is pleased to announce the MHVC250 high voltage dc/dc converter. The MHVC250 design features a wide input range of 420VDC to 975VDC which converts voltage from the third rail to 24VDC for supplying points, signal lamps and

Compact, Rugged DC / AC Inverter for Rail and Industrial Applications

Schaefer announces the PRP-1500 Series of highly efficient, pure sine wave inverters that provide up to 1500VA of power in a chassis mount package. The PRP-1500 Series has versions that meet industrial (EN60950) or rail (EN50155) standards. Standard input voltages of 12VDC, 24VDC, 48VDC

Schaefer, Inc.

45 South Street

Hopkinton, MA 01748

United States of America

+1 508 435 6400 +1 508 435 6401 www.schaeferpower.com