Product Information

The Guardian FMD15.24 compact 1500 watt 48 volt input hot swap DC-DC converter supports up to 7.5kW in a 1 RU 23” shelf. It is fully compatible with the Guardian power system platform.

Guardian 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 +24VDC and -48VDC equipment is utilized.

The FMD15.24 1500 watt 48 volt input hot swap DC-DC converter meets international safety standards and displays the CE-Mark for the European Low Voltage Directive (LVD).


Features and Options
  • 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
VoltageOperating Range: 36-60VDC
FuseTwo 40A fast blow (negative line)
Voltage Range22-26VDC
Current62.5A NOMINAL
Efficiency90.5% typical
ToleranceVout ±1.0%
Transient Response±5% at load variation 10-90% or 90-10%
20ms recovery
Load Sharing<5% of nominal current
Ripple<200mV p-p (BW 20 MHz)
Psophometric<2mV, according to CCITT norms
Inrush CurrentETSI ETS 300 132-1
EMCETSI EN300 386 V.1.3.2
EN61000-6-1, EN61000-6-2
EN61000-6-3, EN61000-6-4
EN55024 performance criterion A
EN55022 Class B
Telcordia NEBS GR1089
EnvironmentalStorage: ETSI EN300 019-2-1
Transport: ETSI EN300 019-2-2
Operation: ETSI EN300 019-2-3
Damp Heat: IEC60068-2-78
MIL-STD-810D section 507.2
Earthquake: GR 63 Core Zone 4
Dimensions, inches (mm)4.2 W x 14.0 D x 1.6 H (107 W x 355 D x 41 H)
Weight4.4lbs. (2.0kg)
CoolingFan-cooled, speed controlled
InsulationInput, output to PE
Mounting19in/23in x 1U subrack
up to 4/5 modules
ProtectionShort circuit/arcing
automatic current/power limiting
selective shutdown of modules at excessive output
input/output overvoltage
AlarmsFan failure
Short circuit/arcing protection
High temperature/output voltage
Low output voltage
Input voltage out of range
Low fan speed (warning)
Internal communication failure
LED IndicatorsGreen: Input in Range
Yellow steady: Low fan speed, High temperature
Yellow flashing: Comms. failure
Red: Module alarm / shutdown
Audible Noise (nominal input)<45dBA @ ≤25°C (50% load)
<60dBA (100% load)
Operating Temperature-40°C to +75°C up to 2000m
Reduced spec -40°C to -20°C
Derated output power from 55°C
linear derating to 75°C
For 3000m altitude derated by 5°C
Storage Temperature-60°C to +85°C
MTBF @ 25°C (without fan)>350,000 hours to MIL-HDBK-217F-2