AC/DC Power Supplies

Schaefer C5700A-SERIES AC/DC Power Supply

The Schaefer C5700A Series is a high-power AC/DC power supply for industrial applications, delivering output power from 6.5kW to 8kW. Offering a range of output voltages and fan-assisted cooling for reliable performance under demanding conditions, the C5700A Series is designed for flexibility. It can be mounted within a 19" cabinet or on a wall-mountable plate, adapting to various industrial requirements. Multiple units can be installed within a system to provide higher output power or redundant operation. Additional features, such as system monitoring, make the C5700A Series suitable for high-demand environments in sectors like Renewable Energy, Utilities, Mining, and Heavy Industry.

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Schaefer C5700A-SERIES AC/DC Power Supply

Features

Industrial Grade AC/DC Power Supply
High Output Power: 6.5kW - 8kW
AC Input: 1-Phase and 3-Phase Models
Wide Range of DC outputs 9, 12, 15, 24, 28, 48, 60, 110, 200, 220, 400
Mounting via 19" plug-in module or wall plate
Multiple units can be easily installed for high power / redundant installations.

Specifications

INPUT
Input voltage	1ph 115/230Vac 3ph 200/400/480Vac See selection table Units will turn off with under or over input voltage.
No-load input	30W typical
Inrush current	3-phase AC input limited by thermister
Switch on time	<1s typical.
Input Options	See selection table for details Option i: Inrush current limiting Option ie: Electronic inrush current limiting Option sd:Reverse polarity protection for DC input by input by series diode Option ad:Reverse polarity protection for DC input by anti parallel diode Option au:Auto-ranging

OUTPUT
Output voltage	Voltage range; 9 - 400Vdc See selection table
Output power	6.5kW to 8kW 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	10ms typical ±1%
Temp coefficient	0.02% per °C typical.
Holdup time	10mS at 220VAC typical
Turn on rise time	300mS typical (soft start)
Remote sense	standard for all series up to 150 V output, except for battery chargers; up to 10 % of Unom for output < 60 VDC, up to 6 V for output > 60 VD
Overload protection	Current limited at 105%–110% of full load.
Overvoltage protection	OVP switches off module with automatic return to operation; after 5 seconds, the unit will remain latched off
Efficiency	80 - 95% typical
Output Options	See selection table for details Option dd: Decoupling Diode for redundant / parallel operation Option cs: Active Current Sharing Option csi: Current sharing interrupt (“cs” included) Option icsi: Current sharing interrupt (“csi” included), galvanically isolated Option h1: Inhibit by external closing contact, signal referred to input Option h2: Inhibit by voltage signal, signal referred to output Option h3: Inhibit by closing contact, signal referred to output Option rco: Reducing current limiting at over temperature Option rd: Reverse polarity protection for DC output
Signal Options	See selection table for details Option pr: input voltage supervision (power ok) incl. relay contacts Option dr: output voltage supervision (DC ok) incl. relay contacts Option cf: charger / converter fail supervision incl. relay contacts Option ac: AC ok for inverter including relay contacts<

PROGRAMMING
Programming of output voltage from 0 to 100 %	eu1: by external signal, 0 – 10 V eu2: by external signal, 4 – 20 mA eu3: by 270° potentiometer eu4: by 10 turn potentiometer
Programming of output current from 0 to 100 %	ei1: by external signal, 0 – 10 V ei2: by external signal, 4 – 20 mA ei3: by 270° potentiometer ei4: by 10 turn potentiometer
Isolating ampliﬁer for programming	lso: Programming signal is galvanically isolated from any potentials of the power supply.
Programming via	rs: RS232 (external) can: CAN Bus (external)

MONITORING
Monitoring of output voltage from 0 to 100 %	mu1: by external signal, 0 – 10 V mu2: by external signal, 4 – 20 mA
Monitoring of output current from 0 to 100 %	mi1: by external signal, 0 – 10 V mi2: by external signal, 4 – 20 mA
Isolating ampliﬁer for monitoring	Iso: Monitoring signal is galvanically isolated from any potentials of the power supply.
Monitoring via	rs: RS232 (external) can: CAN Bus (external)

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	F: Fan - for increased airflow
Storage temperature	-40°C to +85°C
Humidity	Up to 95% RH, non-condensing
Environment Options	See selection table for details Option t: Tropical protection Option c: Extended temperature range Option ms: Increased mechanical strength

STANDARDS
EMI standards	acc. to EN61000-6-4 class A, optionally class B
Immunity standards	acc. to EN61000-6-2
Safety / Construction	acc. to EN60950-1 / EN50178
Protection category	IP20 acc. to EN60529 NEMA or others on request
MTBF	approx 700Khrs at 40°C acc. to MIL-HDBK-217E (notice 1)

MECHANICAL
Mechanics	High power modules are constructed in 19" format
Dimensions	See Technical illustration
Mechanical Options	Option w: Wall Mounting

Selection Table

INPUT 115Vac ± 20%	OUTPUT AMPS	INPUT 230Vac +15% - 20%	INPUT 3x200Vac +15% - 20%	INPUT 3x400Vac +15% - 20%	INPUT 3x480Vac +15% - 20%	OUTPUT AMPS	COOLING	OUTPUT VOLTAGE	VOLTAGE ADJUSTMENT
C5761	400	----	----	----	----	----	F	9	8 - 10
C5762	400	----	----	----	----	----	F	12	11-13
C5763	385	C5783	C5763V	C5783V	C5793V	400	F	15	14-16
C5764	250	C5784	C5764V	C5784V	C5794V	310	F	24	23-26
C5765	215	C5785	C5765V	C5785V	C5795V	270	F	28	26-30
C5769	115	C5789	C5769V	C5789V	C5799V	145	F	48	45 - 55
C5766	95	C5786	C5766V	C5786V	C5796V	120	F	60	58 - 68
C5767	50	C5787	C5767V	C5787V	C5797V	62	F	110	100-130
C5767J	32	C5787J	C5767VJ	C5787VJ	C5797VJ	40	F	200	190-200
C5768	26	C5788	C5768V	C5788V	C5798V	32	F	220	200-250
C5768J	16	C5788J	C5768VJ	C5788VJ	C5798VJ	20	F	400	380-400

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 high inrush current caused by built-in capacitors. Switch- on time may increase to 5s. This is realized by a series pass transistor or depending on the input voltage by thyristor softstart..
Option “sd”	Reverse polarity protection for DC input by series diode: A series diode protects the module against DC input voltage of wrong polarity. However, this also causes extra losses and reduces the overall efﬁciency..
Option “ad”	Reverse polarity protection for DC input by anti parallel diode: To avoid the power losses 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 of wrong polarity.
Option “au”	Auto-ranging: For standard dual AC input models the range of 115 / 230 V AC 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.

OUTPUT OPTIONS
Option “dd”	Decoupling diode: A series diode built into the units output allows paralleling of 2 or more units for redundancy or higher power or battery charging. For control purposes the anode of the diode is also available at the output connector. It cannot be loaded ≥ 0.5A. The sense signal is taken partially from the anode and partially from the load/cathode of the decoupling diode. This guarantees starting and operating under all conditions, but it also effects the regulation accuracy of 2%. In this way it gives a load sharing of 15-30% between the paralleled units.
Option “cs”	Active current sharing: An additional control circuit provides active current sharing via an interconnecting wire between converters that operate in parallel. The output lines of the converters have to be in “star point” connection
Option “csi”	Current sharing interrupt (“cs” included)“csi” will effect the removal of the “cs” signal from the load voltage common connection. Should there be an instance where a unit is not supplying the load, then the effect of its current sharing signal is removed, and the load voltage is unaffected by this condition. In terms of calibration the same criteria follow as for parallel operation.
Option “icsi”	Current sharing interrupt (“csi” included), galvanically isolated: The inclusion of “csi” (current sharing interrupt) and the galvanic isolation is the optimum set up for systems with high power or high currents, were the voltage drop on the power wiring could inﬂuence the cs signal.
Option “h1”	Inhibit by external closing contact, signal referred to input: The operation of the unit is inhibited when a voltage signal is applied in reference to the negative line of the input. This can also be used in combination with a thermal trip, which shuts the unit down.
Option “h2”	Inhibit by voltage signal, signal referred to output: Operation of the unit is inhibited if a voltage signal (5V / 10mA) is applied in reference to the negative line of the output
Option “h3”	Inhibit by closing contact, signal referred to output: The operation of the unit is inhibited when a voltage signal is applied in reference to the negative line of the output. This can also be used in combination with a thermal trip, which shuts the unit down. Please note: Only relevant solution for inverters.
Option “rco”	Reducing current limiting at over temperature: A circuit reduces the current limiting level at higher temperature (to be speciﬁed).
Option "rd"	Reverse polarity protection for DC output: by reverse diode with external fuse.

SIGNAL OPTIONS
Option “pr”	input voltage supervision (power ok) incl. relay contacts: A logic signal is given if the input voltage (AC or DC) drops below the speciﬁed limit. In AC input models the rectiﬁed input voltage is sensed so that a power fail alarm can be avoided if at light load mains power returns before the input capacitors are substantially discharged. A relay contact is provided for failure indication
Option “dr”	output voltage supervision (DC ok) incl. relay contacts: A logic signal is given if the output voltage is below the speciﬁed limit. A relay contact is provided for failure indication. DC ok level: 5V output: 4,75V all other voltages: 90% of adjusted voltage
Option “cf”	charger / converter fail supervision incl. relay contacts: A logic signal is given if the input voltage, the auxiliary voltage of the primary side and the current of the primary side exceed or go below a speciﬁed range. A relay contact is provided for failure indication.
Option “ac”	AC ok for inverter including relay contacts: A logic signal is given if the output voltage of an inverter is below the speciﬁed limit. A relay contact is provided for failure indication

ENVIRONMENTAL OPTIONS
Option "t"	Tropical protection: The unit is given additional protection by a heavy coat of varnish on the printed circuit board(s) and on components to achieve 99% RH, non condensing.
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
Option "w"	Wall mounting: Modules, which have the wall mount option, are typically ﬁxed to a structure or within a cabinet. Depending on the size of the module, this may be done with a ﬂat or angled plate (see photo). The load connections are typically through a terminal block. Should the application not require a pluggable module / rack solution, wall mounting presents an alternative option for the customer to choose from.

MECHANICAL OPTIONS

Option "w"

Wall mounting: Modules, which have the wall mount option, are typically ﬁxed to a structure or within a cabinet. Depending on the size of the module, this may be done with a ﬂat or angled plate (see photo). The load connections are typically through a terminal block. Should the application not require a pluggable module / rack solution, wall mounting presents an alternative option for the customer to choose from.

Technical Drawings

Diagram of a 19-inch plug-in module, showing dimensions and weight.

Isometric diagram of wall-mountable heater with dimensions.

Diagram showing an appliance with wall mounting dimensions.

Diagram of a 19-inch plug-in module with measurements.

Downloads

Schaefer_cb5700-AC-DC-PS-BatteryChargers-DC-DC-Converters.pdf

Warranty & Returns

Warranty periods vary by product. Please refer to the Powerbox Warranty Policy for the applicable coverage period against manufacturing defects from date of purchase. For returns and RMA requests, please visit our RMA support page or contact our support team directly.

FAQs

What is the power rating of the Schaefer C/B 5700 Series, and how does it compare to the C/B 5600?

The C/B 5700 delivers up to 8kW from three-phase AC input and up to 6.5kW from single-phase input — a step up from the C/B 5600 (6kW / 4.5kW). DC/DC converter variants span 5–40kW. Choose the 5700 when your load requirement exceeds the 5600's capacity but does not yet reach the 12kW of the C/B 5800.

What input voltage and frequency options does the C/B 5700 Series support?

AC/DC models accept 115/230Vac single-phase or 200/400/480Vac three-phase at 47–400Hz, with an AC hold-up time of 4ms typical at nominal input voltage. DC/DC variants accept 80–800Vdc input. The wide frequency range makes the 5700 Series suitable for both 50Hz and 400Hz systems, including marine and avionics ground support.

What output voltages and currents does the C/B 5700 Series provide?

Standard DC output voltages range from 9 to 400Vdc (5Vdc and up to 800Vdc available on request), with output currents up to 400A at lower voltages. Three-phase models deliver up to 8kW total output power with a ripple of ≤1% + 30mV p-p, and a load regulation of 0.2% across 10–90% load.

What battery system voltages does the B 5700 battery charger support?

The B 5700 charger supports nominal battery voltages of 12, 24, 48, 60, 110, and 220Vdc, with higher voltages available on request. All three charge modes are supported — float, equalise/automatic boost, and manual boost — with configurable reference voltages, current limits, and monitoring levels via the optional UC 03 enhanced controller.

What efficiency, protection, and temperature performance does the C/B 5700 offer?

Efficiency is 80–95% typical. Operating temperature is -20°C to +75°C standard, with -40°C optional. Thermal shutdown with auto-restart, continuous short-circuit protection, overvoltage protection, and inrush current limiting are all built in. Output derates at 2.5%/°C above 55°C, ensuring reliable operation across industrial temperature ranges.

What EMC and safety standards does the C/B 5700 Series comply with?

The C/B 5700 Series is constructed to EN 60950-1 / EN 50178 (safety) and EN 61000-6-4 Class A EMI as standard, with optional Class B EMI compliance available. The immunity standard met is EN 61000-6-2. The MTBF is approximately 70,000 hours at 40°C per MIL-HDBK-217E.

Can C/B 5700 units be operated in parallel for increased power or redundancy?

Yes. Parallel operation is supported using decoupling diodes for redundancy, active current sharing (cs), or the galvanically isolated current sharing interrupt option (icsi) for high-current systems where voltage drop on power wiring could affect the current sharing signal. Load sharing of 15–30% between paralleled units is achievable.

What mounting, cooling, and environmental options are available for the C/B 5700 Series?

Modules mount into 19" sub-racks in 6U/9U format (approx. 460mm deep), with optional wall mount (35–50kg). Fan cooling with temperature-controlled fans is standard; liquid cooling is available for higher thermal density installations. Optional tropical protection (conformal coating to 99% RH), extended temperature (-40°C), and increased mechanical strength per EN 61373 are available for marine, rail, and harsh-environment deployments.

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