Battery Chargers

Schaefer B3800 SERIES Battery Charger

The Schaefer B3800 Series delivers reliable and efficient battery charging with a power rating of 2500W, making it well-suited for heavy-duty industrial and critical infrastructure applications. Enclosed in a robust 6U form factor, the B3800 Series employs natural convection cooling for most configurations, with fan-assisted cooling required for 12Vdc models. It supports nominal battery voltages of 12Vdc, 24Vdc, 48Vdc, 60Vdc, 110Vdc, and 220Vdc, enabling compatibility with various battery configurations. Flexible installation options include chassis mount, wall mount, and 19" rackmount via a 6U subrack. Optional enhancements, including electrical protection, monitoring, conformal coating, and increased mechanical strength, ensure exceptional durability and reliability in demanding operational conditions.

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Schaefer B3800 SERIES Battery Charger

Features

  • High Power Capability: Reliable 2500W 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.
  • Efficient Cooling Solutions: Natural convection cooling for most models, with fan-assisted cooling for 12Vdc configurations.
  • 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
B3861 B3881
B3862 B3882
B3864 B3884
B3866 B3886
B3867 B3887
B3868 B3888
Configuration of model designation: Add the designation of options to the model number, eg. C 3674-dd-dr-cs
Please Note: The number of options per module may be restricted due to limitation of space inside the module or due to a limited number of connector pins.
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)
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.
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_cb3800-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
B3861 B3881
B3862 B3882
B3864 B3884
B3866 B3886
B3867 B3887
B3868 B3888
Configuration of model designation: Add the designation of options to the model number, eg. C 3674-dd-dr-cs
Please Note: The number of options per module may be restricted due to limitation of space inside the module or due to a limited number of connector pins.
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)
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.
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_cb3800-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 B3861 115Vac ± 20 % 50/60Hz 12Vdc (Adj. 12 - 16Vdc) 150A
product variant B3862 115Vac ± 20 % 50/60Hz 24Vdc (Adj. 24 - 32Vdc) 80A
product variant B3864 115Vac ± 20 % 50/60Hz 48Vdc (Adj. 48 - 64Vdc) 45A
product variant B3866 115Vac ± 20 % 50/60Hz 60Vdc (Adj. 60 - 80VDc) 35A
product variant B3867 115Vac ± 20 % 50/60Hz 110Vdc (Adj. 110 - 145VDc) 20A
product variant B3868 115Vac ± 20 % 50/60Hz 220Vdc (Adj. 220 - 290Vdc) 10A
product variant B3881 230Vac +15%/-20% 50/60Hz 12Vdc (Adj. 12 - 16Vdc) 150A
product variant B3882 230Vac +15%/-20% 50/60Hz 24Vdc (Adj. 24 - 32Vdc) 80A
product variant B3884 230Vac +15%/-20% 50/60Hz 48Vdc (Adj. 48 - 64Vdc) 45A
product variant B3886 230Vac +15%/-20% 50/60Hz 60Vdc (Adj. 60 - 80VDc) 35A
product variant B3887 230Vac +15%/-20% 50/60Hz 110Vdc (Adj. 110 - 145VDc) 20A
product variant B3888 230Vac +15%/-20% 50/60Hz 220Vdc (Adj. 220 - 290Vdc) 10A
product variant B3891 115Vac ± 20 % 50/60Hz or 230Vac +15%/-20% 50/60Hz 12Vdc (Adj. 12 - 16Vdc) 150A
product variant B3892 115Vac ± 20 % 50/60Hz or 230Vac +15%/-20% 50/60Hz 24Vdc (Adj. 24 - 32Vdc) 80A
product variant B3894 115Vac ± 20 % 50/60Hz or 230Vac +15%/-20% 50/60Hz 48Vdc (Adj. 48 - 64Vdc) 45A
product variant B3896 115Vac ± 20 % 50/60Hz or 230Vac +15%/-20% 50/60Hz 60Vdc (Adj. 60 - 80VDc) 35A
product variant B3897 115Vac ± 20 % 50/60Hz or 230Vac +15%/-20% 50/60Hz 110Vdc (Adj. 110 - 145VDc) 20A
product variant B3898 115Vac ± 20 % 50/60Hz or 230Vac +15%/-20% 50/60Hz 220Vdc (Adj. 220 - 290Vdc) 10A
product variant B3861V 3 x 200Vac +15%/-20% 50/60Hz 12Vdc (Adj. 12 - 16Vdc) 150A
product variant B3862V 3 x 200Vac +15%/-20% 50/60Hz 24Vdc (Adj. 24 - 32Vdc) 80A
product variant B3864V 3 x 200Vac +15%/-20% 50/60Hz 48Vdc (Adj. 48 - 64Vdc) 45A
product variant B3866V 3 x 200Vac +15%/-20% 50/60Hz 60Vdc (Adj. 60 - 80VDc) 35A
product variant B3867V 3 x 200Vac +15%/-20% 50/60Hz 110Vdc (Adj. 110 - 145VDc) 20A
product variant B3868V 3 x 200Vac +15%/-20% 50/60Hz 220Vdc (Adj. 220 - 290Vdc) 10A
product variant B3881V 3 x 400Vac +15%/-20% 50/60Hz 12Vdc (Adj. 12 - 16Vdc) 150A
product variant B3882V 3 x 400Vac +15%/-20% 50/60Hz 24Vdc (Adj. 24 - 32Vdc) 80A
product variant B3884V 3 x 400Vac +15%/-20% 50/60Hz 48Vdc (Adj. 48 - 64Vdc) 45A
product variant B3886V 3 x 400Vac +15%/-20% 50/60Hz 60Vdc (Adj. 60 - 80VDc) 35A
product variant B3887V 3 x 400Vac +15%/-20% 50/60Hz 110Vdc (Adj. 110 - 145VDc) 20A
product variant B3888V 3 x 400Vac +15%/-20% 50/60Hz 220Vdc (Adj. 220 - 290Vdc) 10A
product variant B3891V 3 x 480Vac +10%/-15% 50/60Hz 12Vdc (Adj. 12 - 16Vdc) 150A
product variant B3892V 3 x 480Vac +10%/-15% 50/60Hz 24Vdc (Adj. 24 - 32Vdc) 80A
product variant B3894V 3 x 480Vac +10%/-15% 50/60Hz 48Vdc (Adj. 48 - 64Vdc) 45A
product variant B3896V 3 x 480Vac +10%/-15% 50/60Hz 60Vdc (Adj. 60 - 80VDc) 35A
product variant B3897V 3 x 480Vac +10%/-15% 50/60Hz 110Vdc (Adj. 110 - 145VDc) 20A
product variant B3898V 3 x 480Vac +10%/-15% 50/60Hz 220Vdc (Adj. 220 - 290Vdc) 10A

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