DC/DC Converters

Schaefer C2600D SERIES DC/DC Converter

The Schaefer C2600D Series Industrial Grade DC/DC Converter delivers a robust and versatile power solution for critical industrial applications. With a power rating ranging from 650W to 800W, it supports DC input voltages from 18Vdc to 380Vdc and output voltages from 5Vdc to 220Vdc in both step-up and step-down configurations. Designed for stand-alone operation or integration into parallel-connected systems for redundancy or increased capacity, the C2600D offers flexibility in implementation. Cooling is provided via natural convection, with active cooling required only for 5Vdc output models. Flexible mounting options include wall mount, chassis mount, or 19" rackmount via a separate 3U subrack. Optional features such as monitoring, control, and enhanced environmental protection ensure adaptability to a wide range of environments. Ideal for railway, power utilities (generation, transmission, and distribution), renewable energy, and mining applications, the C2600D Series stands out for its reliability in demanding conditions.

Features

  • Power Rating: 650W to 800W.
  • DC Input/Output: Input range 18Vdc to 380Vdc; output range 5Vdc to 220Vdc.
  • Cooling: Natural convection; active cooling required for 5Vdc output versions.
  • Mounting Options: Wall mount, chassis mount, or 19" rackmount via a 3U subrack.
  • Optional Features: Monitoring, control, mechanical robustness, and enhanced environmental protection.
  • Applications: Suitable for railway, power utilities (generation, transmission, and distribution), renewable energy, and mining industries.
Specifications
INPUT
Input voltage DC Input voltage: 10 - 800Vdc
See selection table
Units will turn off with under or over input voltage.
No-load input power 5-6W model (series dependent)
Switch on time 1-2 seconds.
OUTPUT
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
PROTECTION
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
MTBF 100Khrs to 140Khrs at 40°C acc. to MIL-HDBK-217E (notice 1)
ENVIRONMENTAL
Operating temperature -20°C to +75°C (optional -40 to 75C)
Load derating Derate 2.5% per °C, from +55°C to 75°C
Cooling 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
STANDARDS
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
MECHANICAL
Mounting See technical illustrations
Eurocassette, pluggable module for 19" subrack
Option w: Wall Mounting
Option cha: Chassis Mounting
Dimensions See Technical illustration
Connector 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 Options

Subrack Height 3U, 5U, 6U Wiring, Front Panels 
Accessories: Fuses, MCBs, Mains on/off switch
Contact Powerbox for rack configuration

Selection Table
INPUT 18-36 VDC OUTPUT AMPS INPUT 36-75 VDC INPUT 45-90 VDC INPUT 80-160 VDC INPUT 160 – 320 VDC INPUT 320 – 380 VDC OUTPUT AMPS COOLING HEATINK FAN OUTPUT VOLTAGE VOLTAGE ADJUSTMENT
C2620 85 C2630 C2640 C2650 C2670 C2680Z 100 F 5 4.5 – 5.5
C2621 65 C2631 C2641 C2651 C2671 C2681Z 75 H 9 8 – 10
C2622 50 C2632 C2642 C2652 C2672 C2682Z 60 H 12 11 – 13
C2623 42 C2633 C2643 C2653 C2673 C2683Z 50 H 15 14 – 16
C2624 25 C2634 C2644 C2654 C2674 C2684Z 30 H 24 23 – 26
C2625 22 C2635 C2645 C2655 C2675 C2685Z 27 H 28 26 – 30
C2629 12 C2639 C2649 C2659 C2679 C2689Z 15 H 48 45 – 55
C2626 10 C2636 C2646 C2656 C2676 C2686Z 12 H 60 58 – 68
C2627 5 C2637 C2647 C2657 C2677 C2687Z 6.5 H 110 100 – 130
C2628 2.5 C2638 C2648 C2658 C2678 C2688Z 3.2 H 220 200 – 250
Cooling
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. C2620-dd-dr-cs Options for Input, Output, Environmental 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
INPUT OPTIONS
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 current.
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.
output options
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 losses.
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 parallel.
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 down.
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 indication.
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.
mechanical 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 Illustrations
Downloads
Schaefer_cb2600-AC-DC-PS-BatteryChargers-DC-DC-Converters.pdf
INPUT
Input voltage DC Input voltage: 10 - 800Vdc
See selection table
Units will turn off with under or over input voltage.
No-load input power 5-6W model (series dependent)
Switch on time 1-2 seconds.
OUTPUT
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
PROTECTION
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
MTBF 100Khrs to 140Khrs at 40°C acc. to MIL-HDBK-217E (notice 1)
ENVIRONMENTAL
Operating temperature -20°C to +75°C (optional -40 to 75C)
Load derating Derate 2.5% per °C, from +55°C to 75°C
Cooling 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
STANDARDS
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
MECHANICAL
Mounting See technical illustrations
Eurocassette, pluggable module for 19" subrack
Option w: Wall Mounting
Option cha: Chassis Mounting
Dimensions See Technical illustration
Connector 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 Options

Subrack Height 3U, 5U, 6U Wiring, Front Panels 
Accessories: Fuses, MCBs, Mains on/off switch
Contact Powerbox for rack configuration

INPUT 18-36 VDC OUTPUT AMPS INPUT 36-75 VDC INPUT 45-90 VDC INPUT 80-160 VDC INPUT 160 – 320 VDC INPUT 320 – 380 VDC OUTPUT AMPS COOLING HEATINK FAN OUTPUT VOLTAGE VOLTAGE ADJUSTMENT
C2620 85 C2630 C2640 C2650 C2670 C2680Z 100 F 5 4.5 – 5.5
C2621 65 C2631 C2641 C2651 C2671 C2681Z 75 H 9 8 – 10
C2622 50 C2632 C2642 C2652 C2672 C2682Z 60 H 12 11 – 13
C2623 42 C2633 C2643 C2653 C2673 C2683Z 50 H 15 14 – 16
C2624 25 C2634 C2644 C2654 C2674 C2684Z 30 H 24 23 – 26
C2625 22 C2635 C2645 C2655 C2675 C2685Z 27 H 28 26 – 30
C2629 12 C2639 C2649 C2659 C2679 C2689Z 15 H 48 45 – 55
C2626 10 C2636 C2646 C2656 C2676 C2686Z 12 H 60 58 – 68
C2627 5 C2637 C2647 C2657 C2677 C2687Z 6.5 H 110 100 – 130
C2628 2.5 C2638 C2648 C2658 C2678 C2688Z 3.2 H 220 200 – 250
Cooling
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. C2620-dd-dr-cs Options for Input, Output, Environmental 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
INPUT OPTIONS
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 current.
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.
output options
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 losses.
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 parallel.
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 down.
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 indication.
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.
mechanical 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.
Schaefer_cb2600-AC-DC-PS-BatteryChargers-DC-DC-Converters.pdf

Find the Right Model

Model Number Input Voltage (Vdc) Output Voltage (Vdc) Output Current (A)
product variant C2620 18...36Vdc 5Vdc (Adj. 4.5 - 5.5Vdc) 85A
product variant C2621 18...36Vdc 9Vdc (Adj. 8 - 10Vdc) 65A
product variant C2622 18...36Vdc 12Vdc (Adj. 11 - 13Vdc) 50A
product variant C2623 18...36Vdc 15Vdc (Adj. 14 - 16Vdc) 42A
product variant C2624 18...36Vdc 24Vdc (Adj. 23 - 26Vdc) 25A
product variant C2625 18...36Vdc 28Vdc (Adj. 26 - 30Vdc) 22A
product variant C2629 18...36Vdc 48Vdc (Adj. 45 - 55Vdc) 12A
product variant C2626 18...36Vdc 60Vdc (Adj. 58 - 68Vdc) 10A
product variant C2627 18...36Vdc 110Vdc (Adj. 100 - 130Vdc) 5A
product variant C2628 18...36Vdc 220Vdc (Adj. 200 - 250Vdc) 2.5A
product variant C2630 36...75Vdc 5Vdc (Adj. 4.5 - 5.5Vdc) 100A
product variant C2631 36...75Vdc 9Vdc (Adj. 8 - 10Vdc) 75A
product variant C2632 36...75Vdc 12Vdc (Adj. 11 - 13Vdc) 60A
product variant C2633 36...75Vdc 15Vdc (Adj. 14 - 16Vdc) 50A
product variant C2634 36...75Vdc 24Vdc (Adj. 23 - 26Vdc) 30A
product variant C2635 36...75Vdc 28Vdc (Adj. 26 - 30Vdc) 27A
product variant C2639 36...75Vdc 48Vdc (Adj. 45 - 55Vdc) 15A
product variant C2636 36...75Vdc 60Vdc (Adj. 58 - 68Vdc) 12A
product variant C2637 36...75Vdc 110Vdc (Adj. 100 - 130Vdc) 6.5A
product variant C2638 36...75Vdc 220Vdc (Adj. 200 - 250Vdc) 3.2A
product variant C2640 45...90Vdc 5Vdc (Adj. 4.5 - 5.5Vdc) 100A
product variant C2641 45...90Vdc 9Vdc (Adj. 8 - 10Vdc) 75A
product variant C2642 45...90Vdc 12Vdc (Adj. 11 - 13Vdc) 60A
product variant C2643 45...90Vdc 15Vdc (Adj. 14 - 16Vdc) 50A
product variant C2644 45...90Vdc 24Vdc (Adj. 23 - 26Vdc) 30A
product variant C2645 45...90Vdc 28Vdc (Adj. 26 - 30Vdc) 27A
product variant C2649 45...90Vdc 48Vdc (Adj. 45 - 55Vdc) 15A
product variant C2646 45...90Vdc 60Vdc (Adj. 58 - 68Vdc) 12A
product variant C2647 45...90Vdc 110Vdc (Adj. 100 - 130Vdc) 6.5A
product variant C2648 45...90Vdc 220Vdc (Adj. 200 - 250Vdc) 3.2A
product variant C2650 80...160Vdc 5Vdc (Adj. 4.5 - 5.5Vdc) 100A
product variant C2651 80...160Vdc 9Vdc (Adj. 8 - 10Vdc) 75A
product variant C2652 80...160Vdc 12Vdc (Adj. 11 - 13Vdc) 60A
product variant C2653 80...160Vdc 15Vdc (Adj. 14 - 16Vdc) 50A
product variant C2654 80...160Vdc 24Vdc (Adj. 23 - 26Vdc) 30A
product variant C2655 80...160Vdc 28Vdc (Adj. 26 - 30Vdc) 27A
product variant C2659 80...160Vdc 48Vdc (Adj. 45 - 55Vdc) 15A
product variant C2656 80...160Vdc 60Vdc (Adj. 58 - 68Vdc) 12A
product variant C2657 80...160Vdc 110Vdc (Adj. 100 - 130Vdc) 6.5A
product variant C2658 80...160Vdc 220Vdc (Adj. 200 - 250Vdc) 3.2A
product variant C2670 160...320Vdc 5Vdc (Adj. 4.5 - 5.5Vdc) 100A
product variant C2671 160...320Vdc 9Vdc (Adj. 8 - 10Vdc) 75A
product variant C2672 160...320Vdc 12Vdc (Adj. 11 - 13Vdc) 60A
product variant C2673 160...320Vdc 15Vdc (Adj. 14 - 16Vdc) 50A
product variant C2674 160...320Vdc 24Vdc (Adj. 23 - 26Vdc) 30A
product variant C2675 160...320Vdc 28Vdc (Adj. 26 - 30Vdc) 27A
product variant C2679 160...320Vdc 48Vdc (Adj. 45 - 55Vdc) 15A
product variant C2676 160...320Vdc 60Vdc (Adj. 58 - 68Vdc) 12A
product variant C2677 160...320Vdc 110Vdc (Adj. 100 - 130Vdc) 6.5A
product variant C2678 160...320Vdc 220Vdc (Adj. 200 - 250Vdc) 3.2A
product variant C2680Z 320...380Vdc 5Vdc (Adj. 4.5 - 5.5Vdc) 100A
product variant C2681Z 320...380Vdc 9Vdc (Adj. 8 - 10Vdc) 75A
product variant C2682Z 320...380Vdc 12Vdc (Adj. 11 - 13Vdc) 60A
product variant C2683Z 320...380Vdc 15Vdc (Adj. 14 - 16Vdc) 50A
product variant C2684Z 320...380Vdc 24Vdc (Adj. 23 - 26Vdc) 30A
product variant C2685Z 320...380Vdc 28Vdc (Adj. 26 - 30Vdc) 27A
product variant C2689Z 320...380Vdc 48Vdc (Adj. 45 - 55Vdc) 15A
product variant C2686Z 320...380Vdc 60Vdc (Adj. 58 - 68Vdc) 12A
product variant C2687Z 320...380Vdc 110Vdc (Adj. 100 - 130Vdc) 6.5A
product variant C2688Z 320...380Vdc 220Vdc (Adj. 200 - 250Vdc) 3.2A

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