Technical Parameters Basic Information Brand: ALSTOM / Converteam Part Number: MMLB01 Form Factor: Standard 3U slide-in rack pluggable module Matching System: EP3-E-4-EN / EPIC-III traction main control board, auxiliary power supply, analog sampling & TCMS communication boards Application: Urban metro & light rail traction rack auxiliary digital signal expansion, cooling system, cabinet auxiliary equipment logic control Control Power Supply Rated operating voltage: DC 24V vehicle control power Operating range: 18 VDC ~ 30 VDC Max power consumption: 7.5 W Protection: Reverse polarity diode, TVS surge filter, input overcurrent fuse Opto-Isolated Digital IO Resources Digital Inputs (DC24V isolated) Cooling fan running/fault feedback, water pump status, air pressure switch, cabinet temperature switch, auxiliary contactor feedback, filter clogging alarm, door auxiliary lock signal Digital Outputs (DC24V relay drive) Cooling fan start/stop, water pump control, cabinet heating, auxiliary alarm light, filter cleaning relay trigger All IO built-in EMI filter to suppress traction power switching interference Hardware input debounce circuit to avoid vehicle power transient mis-triggering Internal Rack Communication Proprietary high-speed backplane bus, bidirectional data interaction with traction master CPU: upload all auxiliary equipment status signals, receive CPU control commands to drive output contacts; synchronize system clock signal. 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: Power OK, Bus Communication Active, Digital Input Trigger, Output Action Indicator Fastening: Anti-looseness lock buckle, stable contact under long-term vehicle vibration Railway Environmental & EU EN Compliance Operating ambient temperature: -25 ℃ ~ +70 ℃ Storage & transport temperature: -40 ℃ ~ +85 ℃ Relative humidity: 5% ~ 95% non-condensing Vibration 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