Technical Parameters Basic Information Brand: ALSTOM / Converteam Part Number: MVAJ55H1JB08588 Form Factor: Standard 3U slide-in rack pluggable power module Matching peripheral boards: MVTU/MVTT traction master control CPU, MCND series IGBT gate drive PCBs, CDG11/MCGG/MCGV analog sampling & safety interlock boards, MCAA/TRVC/P127 TCMS communication boards, MMLB01/MMLG01 digital I/O expansion boards, PRS12 series low-voltage backup power supply Application: Heavy-duty European urban metro & light rail traction converter, centralized isolated auxiliary power source for all rack low-voltage control electronics High-Voltage Input Specifications Input source: Vehicle traction main DC link Input voltage operating range: 400 VDC ~ 900 VDC wide fluctuation range Max rated input power: 350 W Input protection functions: Overvoltage lockout protection, undervoltage automatic shutdown, reverse polarity blocking diode, multi-stage high-voltage surge absorption circuit, built-in high-current input fuse, over-temperature interlock shutdown Galvanically Isolated Multi-Channel Stabilized Outputs DC24V / 6.0A Power supply for MMLB/MMLG digital I/O modules, control relays, temperature & current analog sensors, cabinet anti-condensation auxiliary heater ±15V / 2.9A Dedicated precision power for all analog signal conditioning and high-precision sampling circuit boards ±5V / 3.9A Core logic power for DSP traction master CPU, rack backplane communication logic chips and non-volatile fault storage memory Dual independent isolated ±18V Separate insulated power rail exclusively for all MCND IGBT gate drive monitoring PCBs All secondary output circuits achieve complete galvanic isolation from high-voltage primary DC side, high insulation withstand voltage to block power loop interference Independent hardware protection for each output channel: short-circuit hardware latch-off, overcurrent current limiting, over-temperature auto shutdown, automatic self-recovery after fault elimination Mechanical Specifications Overall dimension: H130 mm × W98 mm × D220 mm PCB protection: Full acrylic conformal coating, anti-moisture, anti-corrosion, anti-dust, anti-mold Front panel LED status indicators: HV Input Ready, 24V Aux Output Normal, ±18V Gate Drive Power Normal, Overheat Alarm, General Channel Fault Warning Fastening structure: Anti-looseness lock buckle, maintains stable electrical contact under long-term vehicle running vibration and impact Customized optimization: Thickened heat sink, optimized internal transformer and power tube layout, improved air convection channel for confined cabinet installation Railway Environmental & EU EN Compliance Operating ambient temperature: -25 ℃ ~ +70 ℃ Storage & transport temperature: -40 ℃ ~ +85 ℃ Relative humidity: 5% ~ 95% non-condensing Vibration test standard: IEC 61373 railway rolling stock Shock resistance: 12g half-sine wave impact test EMC standard: EN 50121-3-2 railway vehicle electromagnetic compatibility Fire safety grade: EN 45545-2 HL2 low smoke, low toxicity flame retardant material