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C2500D SERIES C2500D - Schaefer Euro Series DC/DC Converter

  • 300 - 400W
  • Industrial Grade DC/DC Converter
  • High Operating Temp
  • Hot Pluggable
  • Wide Input voltage
  • Configurable Options
  • Eurocassette Mounting
  • Wall Mounting
  • Chassis Mounting.

C2500D - Schaefer Euro Series DC/DC Converter

Product Overview


Schaefer Series of Ruggedised 400 Watt, 3U High, VME/Eurorack compatible DC/DC and AC/DC Converters

The use of industrial grade components adds to the robust nature of the design, making them ideal for a variety of applications including industrial, process control systems and power stations.

Schaefer's C2500 Series is available in 8 input versions from 18VDC to 380VDC, as well as 115 and 230VAC and 208V 3 phase. They offer single outputs from 4.5 - 250VDC. All outputs are isolated, adjustable, and fully regulated to 0.2% or better (load) and 0.1% (line).

All units in the C2500 series have remote sensing, overvoltage protection and current limit protection on the output. Efficiencies run up to 90%. Cooling method is natural convection. Operating temperatures available include -20°C to +75°C and -40°C to +75°C.

The units are packaged in a 3U x 21TE x 226mm VME/Eurorack module and incorporate a 41612 H15 I/O connector. Options available include decoupling diodes for parallel operation, “ruggedisation”, inhibit, Power fail/DC-ok, system reset, active current sharing, wall mounting and chassis mount.


Input voltage

DC Input voltage: 10 - 800Vdc

See selection table

Units will turn off with under or over input voltage.

No-load input
5-6W model (series dependent)
Switch on time 1-2 seconds.
Output voltage

Voltage range; 4.5 - 400Vdc

See selection table

Output current See selection table.
Ripple & noise 1% + 30mVpp
Line regulation 0.1% (±10%)
Load regulation 0.2% typical, load step 10-90%
Load transient 6% typical, load step 10-90%
Response time 2-3ms typical ±1%
Temperature coefficient 0.02% per °C typical.
Holdup time 10mS at 220VAC typical
Turn on rise time 100mS typical (soft start)
Remote sensing Standard for all series
Efficiency 80%-92% typical
Output Options

Option dd: Decoupling Diode for redundant / parallel operation

Option cs: Active Current Sharing

Option h: Remote on/off (inhibit)

Option dr: DC OK via relay contacts

Overload protection Current limited at 105%–110% of full load.
Overvoltage protection OVP switches off module with automatic return to operation
Protection Options

Option i: Inrush Current Limiting

Option sd: Reverse polarity protection for DC input by Series Diode


100Khrs to 140Khrs at 40°C

acc. to MIL-HDBK-217E (notice 1)

Operating temperature

-20°C to +75°C

(optional -40 to 75C)

Load derating Derate 2.5% per °C, from +55°C to 75°C

H: Heatsink - natural convection

F: Fan - increased airflow recommended

TF: Temperature controlled Fan included

See selection table

Environment Options

Option c: Extended temperature range to -40°C

Storage temperature -40°C to +85°C
Humidity Up to 95% RH, non-condensing
EMI standards acc. to EN61000-6-4 class A, optionally class B
Immunity standards acc. to EN61000-6-2
C-Tick AS/NZS CISPR11: 2002 Group1 Class A
Safety / Construction acc. to EN60950-1 / EN50178
Protection category

IP20 acc. to EN60529

NEMA or others on request


See technical illustrations

Eurocassette, pluggable module for 19" subrack

Option w: Wall Mounting

Option cha: Chassis Mounting

Dimensions See Technical illustration

H15 acc. to DIN 41612 H15

and high current connectors for I > 50A,

or terminals / bolts / bars

Mechanical Options

Option ms: Increased Mechanical Strength

Option t: Tropical protection

19" Rack Mounting


Subrack Height 3U, 5U, 6U

Wiring, Front Panels

Accessories: Fuses, MCBs, Mains on/off switch

Contact Powerbox for rack configuration

Selection Table













160 - 320V


320 - 380V










C2520 45   C2530 C2540 C2550 C2570 C2580Z 55   H   5 4.5-5.5
C2521 27   C2531 C2541 C2551 C2571 C2581Z 32   H   9 8-10
C2522 23   C2532 C2542 C2552 C2572 C2582Z 27   H   12 11-13
C2523 20   C2533 C2543 C2553 C2573 C2583Z 23   H   15 14-16
C2524 13   C2534 C2544 C2554 C2574 C2584Z 15   H   24 23-26
C2525 11   C2535 C2545 C2555 C2575 C2585Z 13   H   28 26-30
C2529 6   C2539 C2549 C2559 C2579 C2589Z 7.2   H   48 45-55
C2526 5   C2536 C2546 C2556 C2576 C2586Z 6   H   60 58-68
C2527 2.5   C2537 C2547 C2557 C2577 C2587Z 3   H   110 100-130
C2528 1.3   C2538 C2548 C2558 C2578 C2588Z 1.6   H   220 200-250


H: Heatsink - natural convection

F: Fan - increased airflow recommended

TF: Temperature controlled Fan included

See selection table

Model designation options:

Add the designation of options to the model number, eg. C2520-dd-dr-cs

Options for Input, Output, Environment and Mechanical follow

19" Rack Mounting Options

Subrack Height 3U, 5U, 6U

Wiring, Front Panels

Accessories: Fuses, MCBs, Mains on/off switch

Contact Powerbox for rack configuration

Option “i” (inrush current limiting): A thermistor is connected in series with the
input lines which changes its resistance from high to low when it gets hot. It does
not reduce the current surge if the input power is interrupted for a short period of
time not allowing the thermistor to cool down. Thermistors are fitted as standard
to all mains input models except for 1-phase input of models > 2.5kW.
Thermistors are available up to 45A. For higher input current an electronic inrush
current limitation can be offered.
Option “ie” electronic inrush current limiting An electronic circuit limits the inrush
Option “sd” (series diode): A series diode protects the module against input
voltage of wrong polarity (additional power losses).
Option “ad” (anti-parallel diode): To avoid the power losses of a series diode a diode is
provided with opposite polarity in parallel to the input blowing an internal or external
fuse if the module is connected to a supply with wrong polarity.
Option “au” (auto-ranging) For standard dual AC input models the range of
115/230Vac is to be selected by connecting the input line to different pins on the
connector. With auto-ranging the unit senses the input voltage and provides
automatically the correct connection.
Option “p” (power fail): A signal (logic or relay) is given if the input voltage (AC or
DC) drops below the specified limit. In AC input units we sense the rectified input
voltage so that a power fail alarm will not be triggered if at light loads mains
power returns before the input capacitors are substantially discharged.
Option “r” (relay): A relay instead of a logic signal is provided for failure indication.
Option “dd” (decoupling diode): For redundant operation the outputs of two or
more units are paralleled behind de-coupling diodes so that an internal fault of
one module does not affect the operation of the others. These diodes cause power
Option “cs” (active current sharing): An additional control circuit provides active
current sharing via an interconnecting wire between converters that operate in
parallel. Active current sharing should be used for multi-output units operating in
Option “csi” (current sharing interrupt): Option "csi" will effect the removal of the
"cs" signal. Should there be an instance where a unit is not supplying the load,
then the effect of its "cs" signal is removed, and the load voltage is unaffected by
this condition.
Option “h1” (inhibit): A terminal connected to the negative input line also shuts off the
converter. This can also be used in conjunction with a thermal trip which shuts the unit
Option “h2” (inhibit): Operation of the unit is inhibited if a voltage signal
(5V/10mA) is applied in reference to the negative line of the (main) output.
Option “rco” (reducing current limiting at over temperature) A circuit reduces the
current limiting level at higher temperature (to be specified).
Option “d” (DC-ok, one output): A logic signal is given if the output voltage (main
output in multi-output systems) is below the specified limit.
Option “m” (DC-ok, all outputs): In multi-output systems a logic signal is provided
if the voltage of any output is below the specified limit.
Option “ac” (AC ok) A logic signal connected to relay contacts is given if the
output voltage of an inverter is below the specified limit.
Option "y" (sys-reset): This logic signal is a combination of power fail and DC-ok
as specified for VME systems.
Option "r" (relay): A relay instead of a logic signal is provided for failure
environment options
Option "t" (tropical protection):The unit is given additional protection by a heavy
coat of varnish on the printed circuit board(s) and components.
Option "c" (extended temperature range):The circuit is designed and tested for
operation at an ambient temperature as low as –40 °C.
Option "ms" (increased mechanical strength): Screws are secured by Locktite and
heavy components are fastened by ties and/or glue. Modules with the "ms" option
meet the standard EN61373 regarding shock and vibration.
mechanics options
Standard mounting "Eurocassette" pluggable module for 19" sub-racks 8
Option "w" (wall mounting): Module is screwed against a mounting plate for
installation in a cabinet. The load connections are typically a terminal block.
Option "cha" (chassis mount) Module is designed for installation to a structure or
within cabinet. Screw type connectors are supplied with the module.
Option "din" (DIN rail mount) Module is designed for DIN rail mounting to a
structure or within Cabinet. Screw type connectors are supplied with the module.

Technical Illustration

  • C2500 C2500
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