Bel Power Solutions Melcher™ LR Series

Bel Power Solutions Melcher™ LR series 300 W AC-DC converters

Bel Power Solutions announced their Melcher™ LR Series 300 W AC-DC cassette converters

Bel Power Solutions Melcher LR Series AC-DC Converters

Bel Power Solutions, a Bel group company (NASDAQ: BELFA and BELFB) and premier global manufacturer of power management devices, today announced their Melcher™ LR Series 300 W AC-DC cassette converters, which are designed for railway and rugged industrial applications. These new LR Series products are an enhancement to Bel Power Solutions’ existing broad range of 19" cassette power supplies, ideal for when robustness and high reliability are required. The products feature a universal AC input voltage range including active inrush current limitation and power factor correction (PFC). Two highly efficient, isolated outputs of 12 or 15 V up to 300 W offer maximized flexibility in system architecture and make them uniquely suited for various railway applications, such as signaling, rugged communication, heavy duty industrial control, as well as mission-critical defense and security systems.

The converters are incorporated in a rugged aluminum extruded case and can operate in a convection / conduction cooled environment at temperatures from -40° up to 85°C. All PCBs are conformal coated and protected against humidity and pollution which occurs during typical lifecycles of +20 years. LR Series are fully compliant and safety approved to the latest edition of IEC/EN 62368-1 and UL/CSA 62368-1. Underlining the high quality and reliability of the LR Series, Bel Power Solutions is offering an extended warranty of 5 years on all LR Series power converters.

The converters are fully protected against over-load, -voltage, -temperature, under voltage, no-load and short circuit with automatic recovery. Additional features include integrated hold- up capacitors for 20ms interruption, active current share for parallel and redundant operation, rectangular current limit characteristic and remote voltage adjust, inhibit and fail signal.



  • Class I equipment
  • Universal AC input voltage range with PFC and DC input
  • Inrush current limitation
  • 2 isolated, adjustable outputs
  • No load, overload, and short-circuit proof
  • Rectangular current limiting characteristic with flexible load distribution
  • Inhibit function
  • Parallel operation with active current sharing
  • Interruption time 20 ms
  • Immunity according to EN 61000-4-2, -3, -4, -5, -6, -8
  • RoHS-compliant
  • Fire & smoke according to EN 45545
  • All PCB boards protected by lacquer
  • Very high reliability
  • 5 year warranty
  • AREMA compliant



  • Best-in-class efficiency of up to 98%
  • Wide input voltage range: Full power available at 200-250VAC, reduced output power at 100-200 VAC
  • AC input with power factor correction
  • 4000 W main output with programmable voltage set-point of 42-58 VDC
  • Optional Standby output 12 VDC / 60 W
  • One single rear side connector for input and output power and signaling
  • Parallel operation with active digital current sharing through CAN bus
  • Hot-plug capable
  • High density design: 44 W/in3
  • Small form factor: 69 x 40.6 x 528 mm
  • Full digital controls for improved performance
  • CAN communication interface for monitoring, control, and firmware update via bootloader, optional I2C communication instead of CAN bus foreseen
  • Overtemperature, output overvoltage and overcurrent protection
  • 2 Status LEDs: AC OK and DC OK with fault signaling
  • Safety-approved to UL/CSA 62368-1 and IEC 62368-1
  • RoHS Compliant
  • US Patent Pending



  • Data Center
  • High Performance Servers
  • Routers
  • Switches

Bel Power Solutions Melcher LR Series AC-DC Converters | Avnet Abacus

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