Technical Parameters Basic Information Brand: ALSTOM / Converteam Part Number: NG4 Equivalent platform model: PRS12N04BA Form Factor: Standard 3U slide-in rack pluggable low-voltage power supply module Matching peripheral boards: MVTU/MVTT traction master CPU, MVAJ/MVAX/MVUA high voltage auxiliary power supply, 8197-4002/8198-4002 analog sampling boards, 8165-4004 IGBT gate drive boards, 8239-4018 digital safety I/O boards, 9510-4001 TCMS communication gateway, SIR4 safety relay isolation board Application: European urban metro & light rail traction converter, independent battery-powered backup logic power supply, guarantees fault recording and vehicle communication functions when traction high-voltage system is shut down 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 protection, undervoltage lockout interlock, reverse polarity blocking diode, multi-stage TVS surge absorption circuit, built-in high-current input fuse Galvanically Isolated Stabilized Output Channels DC24V / 4.0A Standard working power for digital I/O boards, safety relay loops, signal conditioning circuits and cabinet monitoring sensors ±15V / 1.8A Precision reference power for high-precision analog sampling and 4–20mA temperature signal acquisition circuits ±5V / 3.0A Core logic power for DSP traction master CPU, rack backplane communication chips and non-volatile fault storage memory All output circuits achieve complete galvanic isolation from DC110V input side to eliminate ground loop potential difference interference Independent hardware protection for each channel: overcurrent current limiting, short-circuit auto latch-off, over-temperature 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 indicators: DC110V Input Power OK, 24V Output Normal, ±15V Output Normal, ±5V Logic Fault Alarm, Overheat Warning Fastening structure: Anti-looseness lock buckle, maintains stable electrical contact under long-term vehicle running vibration and impact NG4 optimization feature: Compact component layout, enhanced multi-stage EMI filter, improved heat convection for narrow confined traction 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