Technical Parameters Basic Information Brand: ALSTOM / Converteam Part Number: PRS12N04BA Form Factor: Standard 3U slide-in rack pluggable low-voltage power supply module Matching peripheral boards: MVTU/MVTT traction master CPU, MCND IGBT gate drive boards, CDG11/MCGG/MCGV analog sampling boards, MCAA/TRVC/P127 TCMS communication boards, MMLB/MMLG digital I/O expansion boards Application: European urban metro & light rail traction converter, independent backup low-voltage logic power supply for all rack control plug-ins, works in parallel with MVAJ/MVAX/MVUA high-voltage auxiliary power series Input Power Specifications Rated input voltage: DC 110V vehicle auxiliary battery power Wide operating input range: DC 77V ~ 137.5V Max rated input power: 120 W Input protection functions: Overvoltage cut-off, undervoltage lockout, reverse polarity blocking diode, multi-stage TVS surge absorption, input high-current fuse Galvanically Isolated Stabilized Output Channels DC24V / 4.0A Working power for digital I/O boards, relay loops, signal conditioning circuits, cabinet auxiliary monitoring sensors ±15V / 1.8A Precision reference power for high-precision analog sampling and temperature signal acquisition circuits ±5V / 3.0A Core logic power for DSP traction master CPU, rack backplane communication chips, non-volatile fault memory All outputs complete galvanic isolation from DC110V input side Independent hardware protection per channel: overcurrent limiting, short-circuit auto latch-off, over-temperature shutdown, automatic self-recovery after fault clearance 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 indicators: Input Power OK, 24V Output Normal, ±15V Output Normal, ±5V Fault Alarm, Overheat Warning Fastening structure: Anti-looseness lock buckle, maintains stable electrical contact under long-term vehicle vibration and impact 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