FMD15.24 DC/DC Converter
Data Sheet


  • High efficiency and energy saving
  • > 90.5% typical efficiency
  • Leading power density of up to 31.3 W/in³
  • Rugged input voltage range
  • Thermal protection
  • Hot-swappable
  • International standards compliance



These compact converters support up to 7.5 kW in a 1 RU 23” shelf. They are fully compatible with the Guardian power system platform. Rectifiers and converters can be installed in the same shelf for increased flexibility and monitored by a single system controller. Ideal for use in installations where both +24 VDC and -48 VDC equipment is utilized.

19", 6 RU Dual Voltage System
(-48 VDC / 12.5 kW & +24 VDC / 4.5 kW)
with Controller, Load & Battery Distribution

Input   Mechanical Data
Model FMD15.24 Dimensions 107 x 355 x 41 mm (WxDxH)
Input Voltage 36 – 72 VDC Weight 2 kg
Input Current Maximum: 53.5 A Cooling Fan-cooled, speed controlled
Inrush: <5 Arms (time base 100 ms) Insulation Input, output to PE
Fuse 2 x 40 A (negative wire) Enclosure IP20
    Mounting 19in/1U subrack up to 4 modules,
or 23in/1U subrack up to 5 modules
Output   Other Technical Data  
Output Voltage 22 – 26 VDC Protection Short circuit/arcing protection,
automatic current/power limiting,
selective shutdown of modules at excessive output,
input/output overvoltage protection,
thermal protection
Output Power Po Max =1500 W Alarms Fan failure
Short circuit/arcing protection
High temperature/output voltage
Low output voltage
Input voltage out of range
Low fan speed (warning)
Internal communication failure
Output Current Nominal: 62.5 A Indicators Green LED AC in range
Yellow LED Low fan speed,
High temperature
Flashing Communications
Red LED Module failure /
Maximum: 72 A
Efficiency 90.5% typical Audible noise
(nominal input)
<45 dBA at 25°C (50% load)
<60 dBA (100% load)
Tolerance Vout ± 1.0% Temperature Operating:
-40˚C to +75°C up to 2000 m
Reduced spec -40˚C to -20˚C
Derated output power 55˚C to 75˚C
For 3000 m altitude derate by 5˚C
Storage: -60°C to +85°C
Transient Response ±5% at load variation 10-90% or
90-10% recovery time 20 ms
MTBF >350,000 hours (without fan) at 25°C to MIL-HDBK-217F-2
Load Sharing <5% of nominal current  
Ripple <200 mV p-p (BW 20 MHz)
Psophometric <2 mV, according to CCITT norms
Inrush Current ETSI EN 300 132-1
Harmonics EN 61000-3-2
EMC ETSI EN 300 386 V.1.3.2
EN 61000-6-1, EN 61000-6-3
EN55024 performance criterion A
EN 61000-6-2, EN 61000-6-4
EN 55022 Class B
Telcordia NEBS GR1089
Safety CSA 60950-1-03 1st
EN 60950-1
Environment Storage: ETSI EN 300 019-2-1
Transport: ETSI EN 300 019-2-2
Operation: ETSI EN 300 019-2-3
Damp Heat: IEC 60068-2-78, MIL-STD-810D section 507.2
Earthquake: GR 63 Core Zone 4