Battery Chargers

Schaefer B4500 SERIES Battery Charger

The Schaefer B4500 Series is a reliable and high-performance battery charger with a power rating of 1600W, designed for industrial and critical infrastructure applications. Housed in a 6U footprint, the B4500 Series requires increased airflow via external fans for optimal cooling, ensuring dependable performance even in demanding environments. Supporting nominal battery voltages of 12Vdc, 24Vdc, 48Vdc, 60Vdc, 110Vdc, and 220Vdc, it is suitable for a wide range of battery configurations. Flexible mounting options, including chassis mount, wall mount, and 19" rackmount via a 6U subrack, provide versatile installation possibilities. The B4500 Series can be easily paralleled for higher-powered or redundant systems (N+1 or A+B configurations). Optional features, such as additional electrical protection, monitoring, conformal coating, and enhanced mechanical strength, increase resilience and adaptability for challenging industrial environments.

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Schaefer B4500 SERIES Battery Charger

Features

  • High Power Capability: Reliable 1250W battery charger designed for industrial and critical infrastructure applications.
  • AC Input: options for 1-Phase or 3-Phase supply
  • DC Output Voltages: Compatible with a wide range of battery voltages, including 12Vdc, 24Vdc, 48Vdc, 60Vdc, 110Vdc, and 220Vdc.
  • Flexible Installation: Offers multiple mounting options, including wall, or 19" rackmount via a 6U subrack, and options for parallel / redundant system arrangements.
  • Durable Construction: Optional features include conformal coating, enhanced mechanical strength, and additional electrical protection for increased resilience.
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 power 3-6W model (series dependant)
Inrush current AC input limited by thermistor
Switch on time 1-2 seconds.
Input Options Option au: Autoranging for 115/230Vac input Option pr: Power OK via relay contacts
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
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 Programming Options: See selection table
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
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)
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

115VAC

± 20%

INPUT

230VAC

+15% - 20%

INPUT

115 ± 20%

230VAC+15% 20%

INPUT

3X200VAC

+15% - 20%

INPUT'

3X400VAC

+15% - 20%

INPUT

3X480VAC

+15% - 20%

OUTPUT

AMPS

BATTERY

CHARGER

VOLTAGE

VOLTAGE

ADJ. RANGE
B4561 B4581 B4591 B4561V B4581 V B4591V 80 12 12-16
B4562 B4582 B4592 B4562V B4582 V B4592V 46 24 24-32
B4564 B4584 B4594 B4564V B4584 V B4594V 25 48 48-64
B4566 B4586 B4596 B4566V B4586 V B4596V 20 60 60-80
B4567 B4587 B4597 B4567V B4587 V B4597V 12 110 110-145
B4568 B4588 B4598 B4568V B4588 V B4598V 6 220 220-290

Cooling

H: Heatsink - natural convection

F: Fan - increased airflow recommended

TF: Temperature controlled Fan included

See selection table

Model configuration options:

Add the options to the model number, eg. B4588-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

 

OPTIONS INPUT
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
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.

 

CHARGER PROGRAMMING
Option "tc" Temperature compensated charging voltage(sensor not included)
Option "ts1" Temperature sensor, not interchangeable due to fixed resistor values
Option "ts2" Interchangeable, IC controlled
Option "ch1" Automatic selection of charging characteristic (float / equalize charge) with timer
Option "ch2" Additionally: Manual selection of charging characteristic
Option "ch3" Additionally: Boost charge operation (manually activated with
time delayed return to normal operation)

 

environment
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
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_cb4500-AC-DC-PS-BatteryChargers-DC-DC-Converters.pdf
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 power 3-6W model (series dependant)
Inrush current AC input limited by thermistor
Switch on time 1-2 seconds.
Input Options Option au: Autoranging for 115/230Vac input Option pr: Power OK via relay contacts
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
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 Programming Options: See selection table
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
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)
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

115VAC

± 20%

INPUT

230VAC

+15% - 20%

INPUT

115 ± 20%

230VAC+15% 20%

INPUT

3X200VAC

+15% - 20%

INPUT'

3X400VAC

+15% - 20%

INPUT

3X480VAC

+15% - 20%

OUTPUT

AMPS

BATTERY

CHARGER

VOLTAGE

VOLTAGE

ADJ. RANGE
B4561 B4581 B4591 B4561V B4581 V B4591V 80 12 12-16
B4562 B4582 B4592 B4562V B4582 V B4592V 46 24 24-32
B4564 B4584 B4594 B4564V B4584 V B4594V 25 48 48-64
B4566 B4586 B4596 B4566V B4586 V B4596V 20 60 60-80
B4567 B4587 B4597 B4567V B4587 V B4597V 12 110 110-145
B4568 B4588 B4598 B4568V B4588 V B4598V 6 220 220-290

Cooling

H: Heatsink - natural convection

F: Fan - increased airflow recommended

TF: Temperature controlled Fan included

See selection table

Model configuration options:

Add the options to the model number, eg. B4588-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

 

OPTIONS INPUT
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
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.

 

CHARGER PROGRAMMING
Option "tc" Temperature compensated charging voltage(sensor not included)
Option "ts1" Temperature sensor, not interchangeable due to fixed resistor values
Option "ts2" Interchangeable, IC controlled
Option "ch1" Automatic selection of charging characteristic (float / equalize charge) with timer
Option "ch2" Additionally: Manual selection of charging characteristic
Option "ch3" Additionally: Boost charge operation (manually activated with
time delayed return to normal operation)

 

environment
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
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_cb4500-AC-DC-PS-BatteryChargers-DC-DC-Converters.pdf

Find the Right Model

Model Number Input Voltage (Vac) Output Voltage (Vdc) Output Current (A)
product variant B4561 115Vac ± 20 % 50/60Hz 12Vdc (Adj. 12 - 16Vdc) 80A
product variant B4562 115Vac ± 20 % 50/60Hz 24Vdc (Adj. 24 - 32Vdc) 46A
product variant B4564 115Vac ± 20 % 50/60Hz 48Vdc (Adj. 48 - 64Vdc) 25A
product variant B4566 115Vac ± 20 % 50/60Hz 60Vdc (Adj. 60 - 80VDc) 20A
product variant B4567 115Vac ± 20 % 50/60Hz 110Vdc (Adj. 110 - 145VDc) 12A
product variant B4568 115Vac ± 20 % 50/60Hz 220Vdc (Adj. 220 - 290Vdc) 6A
product variant B4581 230Vac +15%/-20% 50/60Hz 12Vdc (Adj. 12 - 16Vdc) 80A
product variant B4582 230Vac +15%/-20% 50/60Hz 24Vdc (Adj. 24 - 32Vdc) 46A
product variant B4584 230Vac +15%/-20% 50/60Hz 48Vdc (Adj. 48 - 64Vdc) 25A
product variant B4586 230Vac +15%/-20% 50/60Hz 60Vdc (Adj. 60 - 80VDc) 20A
product variant B4587 230Vac +15%/-20% 50/60Hz 110Vdc (Adj. 110 - 145VDc) 12A
product variant B4588 230Vac +15%/-20% 50/60Hz 220Vdc (Adj. 220 - 290Vdc) 6A
product variant B4591 115Vac ± 20 % 50/60Hz or 230Vac +15%/-20% 50/60Hz 12Vdc (Adj. 12 - 16Vdc) 80A
product variant B4592 115Vac ± 20 % 50/60Hz or 230Vac +15%/-20% 50/60Hz 24Vdc (Adj. 24 - 32Vdc) 46A
product variant B4594 115Vac ± 20 % 50/60Hz or 230Vac +15%/-20% 50/60Hz 48Vdc (Adj. 48 - 64Vdc) 25A
product variant B4596 115Vac ± 20 % 50/60Hz or 230Vac +15%/-20% 50/60Hz 60Vdc (Adj. 60 - 80VDc) 20A
product variant B4597 115Vac ± 20 % 50/60Hz or 230Vac +15%/-20% 50/60Hz 110Vdc (Adj. 110 - 145VDc) 12A
product variant B4598 115Vac ± 20 % 50/60Hz or 230Vac +15%/-20% 50/60Hz 220Vdc (Adj. 220 - 290Vdc) 6A
product variant B4561V 3 x 200Vac +15%/-20% 50/60Hz 12Vdc (Adj. 12 - 16Vdc) 80A
product variant B4562V 3 x 200Vac +15%/-20% 50/60Hz 24Vdc (Adj. 24 - 32Vdc) 46A
product variant B4564V 3 x 200Vac +15%/-20% 50/60Hz 48Vdc (Adj. 48 - 64Vdc) 25A
product variant B4566V 3 x 200Vac +15%/-20% 50/60Hz 60Vdc (Adj. 60 - 80VDc) 20A
product variant B4567V 3 x 200Vac +15%/-20% 50/60Hz 110Vdc (Adj. 110 - 145VDc) 12A
product variant B4568V 3 x 200Vac +15%/-20% 50/60Hz 220Vdc (Adj. 220 - 290Vdc) 6A
product variant B4581V 3 x 400Vac +15%/-20% 50/60Hz 12Vdc (Adj. 12 - 16Vdc) 80A
product variant B4582V 3 x 400Vac +15%/-20% 50/60Hz 24Vdc (Adj. 24 - 32Vdc) 46A
product variant B4584V 3 x 400Vac +15%/-20% 50/60Hz 48Vdc (Adj. 48 - 64Vdc) 25A
product variant B4586V 3 x 400Vac +15%/-20% 50/60Hz 60Vdc (Adj. 60 - 80VDc) 20A
product variant B4587V 3 x 400Vac +15%/-20% 50/60Hz 110Vdc (Adj. 110 - 145VDc) 12A
product variant B4588V 3 x 400Vac +15%/-20% 50/60Hz 220Vdc (Adj. 220 - 290Vdc) 6A
product variant B4591V 3 x 480Vac +10%/-15% 50/60Hz 12Vdc (Adj. 12 - 16Vdc) 80A
product variant B4592V 3 x 480Vac +10%/-15% 50/60Hz 24Vdc (Adj. 24 - 32Vdc) 46A
product variant B4594V 3 x 480Vac +10%/-15% 50/60Hz 48Vdc (Adj. 48 - 64Vdc) 25A
product variant B4596V 3 x 480Vac +10%/-15% 50/60Hz 60Vdc (Adj. 60 - 80VDc) 20A
product variant B4597V 3 x 480Vac +10%/-15% 50/60Hz 110Vdc (Adj. 110 - 145VDc) 12A
product variant B4598V 3 x 480Vac +10%/-15% 50/60Hz 220Vdc (Adj. 220 - 290Vdc) 6A

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