For the rail industry a high reliable power supply is essential, especially for mobile applications such as passenger transport, light rail or freight and for stationary applications such as signaling or trackside. Our modules can be designed for both mobile and stationary applications. In this respect, the low-maintenance design of SCHAEFER power supplies is a major advantage.

Products for rail- & automotive industry

  • AC / DC power supplies & battery chargers
  • DC / DC converter
  • DC / AC inverter
  • AC / AC frequency converter
  • Active harmonic filters
  • Electronic load
  • Thyristor controlled power supplies & battery chargers


To ensure a high reliability and quality of our power supplies, they have to pass through internal testing for high industrial requirements. Furthermore, they can be tested against increased shock and vibration resistance, as well as extreme environmental conditions. All components are selected according to criteria of durability, availability and performance. According to customer requirements national and international standards can be tested in cooperation with external laboratories.

By default, the following standards are met:

  • EN 50178
  • EN 60664-1
  • EN/ IEC 61010-2-201 / EN/ IEC 61010-1
  • EN 61000-6-2
  • EN 61000-6-4
  • EN 55011 / EN 55022 class A
  • EN 61140

Optional standards, approvals or certifications:

  • KTA

Electrical features

By default, all devices are designed with electronic current limiting, overvoltage protection and continuous short circuit protection.

Optionally, the modules can be expanded as follows:

  • Inrush current limiting
  • Reverse polarity protection for DC input
  • Decoupling diode for redundant / parallel operation
  • Active current sharing for parallel operation
  • Hot-pluggable solutions
  • Monitoring of input and output voltage
  • Output programmable
  • Power factor correction (PFC) for single phase input
  • Temperature compensated charging voltage
  • Automatic / manual selection of charging characteristics
  • Remote ON / OFF (inhibit)

Mechanical features

By default, all modules will be offered as a 19″ module or 19″ sub-rack according to IP20.

Optionally, the modules can be extended as follows:

  • Wall mount, chassis mount, DIN rail mount, 19? rack or customized design
  • Fan or liquid cooled
  • Mating connectors, wiring and monitoring instruments in accordance to the customers’ requirements
  • Digital or analog V- and A-meters
  • Monitoring & programming via potentiometer, analog signals or RS232 / IEEE488 interfaces
  • Designed for a high level of shock- and vibration
  • Tropical protection finish on all circuit boards and components to ensure an increased protection category to protect the module from extreme climatic conditions
  • Robust enclosure that can withstand wind, sun, salt water, dirt or dust.
  • Hermetically sealed enclosure for high protection category