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Battery Chargers

Schaefer B2591-7 | 13.7Vdc | 400W | AC/DC Battery Charger | Chassis Mount

The Schaefer B2591-7 is a chassis-mounted battery charger designed for railway signalling and level crossing applications, where reliability and long-term service life are essential.

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Schaefer B2591-7

Features

  • ARTC Type Approved – Certificate No. NESA-S061 for signalling and level crossing applications.
  • Recommended replacement for EOL Enatel RW512 / RW312 Series battery chargers.
  • Natural convection cooling – no fans, reducing potential failure points and increasing long-term reliability.
  • High-temperature operation up to 75 °C for stable performance in signalling and equipment huts.
  • Chassis-mounting design – Simple installation with easily accessible wiring terminals.
  • Supports parallel and redundant operation with active current sharing for load balancing and system redundancy.
Specifications
INPUT
Voltage Range 115V AC ±20% or 230V AC +15%/-20% (Auto-Ranging), unit switches off at under and overvoltage
Frequency 50/60Hz
Recommended Input Fuse / MCB External, 10A time lag / K-characteristic related to MCB`s manufactured by ABB
No-load Input Power Approx. 6W
Switch-on Time 300ms typical
Inrush Current Limiting by thermistor
OUTPUT
Voltage 13.7V DC (adjustable 12 … 16V DC)
Current 23A
Line Regulation (±10%) 0.1 %
Load Regulation (10-90%) < 2%
Efficiency at Full Load Approx. 85%
Switching Frequency Approx. 33 kHz
Ripple ≤ 1% +30mVp-p
Load Transient (10-90-10%) 6 % typical
Response Time to ±1 % 2ms typical
Turn-on Rise Time Softstart, 300ms typical
Overload Protection Current limited to 105 ... 110 % of full load
Overvoltage Protection OVP switches off the module at Uout = 18V (with automatic return to operation)
Remote Sensing Internally connected to the output
Redundant Operation Via installed decoupling diode in the (+) output line
Parallel Operation Includes Current Sharing with Interrupt in case of faulty unit in parallel operation
MECHANICAL
Mounting Type Chassis Mount
Connector Type Phoenix Contact
Dimensions 117.5 x 106 x 232.50mm (WxHxD)
Weight Approx. 3.0 kg
Increased Mechanical Strength For shock and vibration in accordance with EN61373
Protection Category Acc. to IP20
Mounting Instructions Only in provided position (cooling fin vertical). Above and below the unit at least 40mm distance to neighbouring parts.
ENVIRONMENTAL
Cooling Natural Convection
Humidity Up to 95% RH, non-condensing 
Temperature Coefficient 0.02 %/°C typical
Operating Temperature -20°C to +75°C
Internal Temperature Switch 90°C heatsink temperature for emergency power off
Load Derating 2.5 %/°C from +55°C
Storage Temperature -40°C to +85°C
ALARMS / MONITORING 
Charger Failure Indicating with relay
DC-OK with Relay (output voltage monitoring) Switching threshold: UOUT>12.3VDC
RELIABILITY
MTBF Approx. 100.000 h at 40°C (in acc. to MIL-HDBK-217E Notice 1) 
SAFETY & STANDARDS
Safety / Construction Acc. to to EN/IEC 61010-2-201 + EN/IEC 61010-1
Earth Leakage < 3.5mA, acc. to EN/IEC 61010-2-201 + EN/IEC 61010-1
EMC Compatibility Acc. to EN 61000-6-2 / EN 61000-6-4 / EN61000-4-4 / EN61000-4-5
Safety Class 1 (equipment with protective earth connection)
Overvoltage Category II
Pollution Degree 2
Maximum Installation Altitude 2000m
Isolation Resistance > 10 MΩ at 500V DC
Isolation Test Acc. to EN/IEC 61010-2-201 + EN/IEC 61010-1
Technical Illustrations
GA_Drawing_B2591-7-Front GA_Drawing_B2591-7-Isometric GA_Drawing_B2591-7-Rear GA_Drawing_B2591-7-Top
Downloads
Schaefer_B2591-7_Datasheet.pdf
INPUT
Voltage Range 115V AC ±20% or 230V AC +15%/-20% (Auto-Ranging), unit switches off at under and overvoltage
Frequency 50/60Hz
Recommended Input Fuse / MCB External, 10A time lag / K-characteristic related to MCB`s manufactured by ABB
No-load Input Power Approx. 6W
Switch-on Time 300ms typical
Inrush Current Limiting by thermistor
OUTPUT
Voltage 13.7V DC (adjustable 12 … 16V DC)
Current 23A
Line Regulation (±10%) 0.1 %
Load Regulation (10-90%) < 2%
Efficiency at Full Load Approx. 85%
Switching Frequency Approx. 33 kHz
Ripple ≤ 1% +30mVp-p
Load Transient (10-90-10%) 6 % typical
Response Time to ±1 % 2ms typical
Turn-on Rise Time Softstart, 300ms typical
Overload Protection Current limited to 105 ... 110 % of full load
Overvoltage Protection OVP switches off the module at Uout = 18V (with automatic return to operation)
Remote Sensing Internally connected to the output
Redundant Operation Via installed decoupling diode in the (+) output line
Parallel Operation Includes Current Sharing with Interrupt in case of faulty unit in parallel operation
MECHANICAL
Mounting Type Chassis Mount
Connector Type Phoenix Contact
Dimensions 117.5 x 106 x 232.50mm (WxHxD)
Weight Approx. 3.0 kg
Increased Mechanical Strength For shock and vibration in accordance with EN61373
Protection Category Acc. to IP20
Mounting Instructions Only in provided position (cooling fin vertical). Above and below the unit at least 40mm distance to neighbouring parts.
ENVIRONMENTAL
Cooling Natural Convection
Humidity Up to 95% RH, non-condensing 
Temperature Coefficient 0.02 %/°C typical
Operating Temperature -20°C to +75°C
Internal Temperature Switch 90°C heatsink temperature for emergency power off
Load Derating 2.5 %/°C from +55°C
Storage Temperature -40°C to +85°C
ALARMS / MONITORING 
Charger Failure Indicating with relay
DC-OK with Relay (output voltage monitoring) Switching threshold: UOUT>12.3VDC
RELIABILITY
MTBF Approx. 100.000 h at 40°C (in acc. to MIL-HDBK-217E Notice 1) 
SAFETY & STANDARDS
Safety / Construction Acc. to to EN/IEC 61010-2-201 + EN/IEC 61010-1
Earth Leakage < 3.5mA, acc. to EN/IEC 61010-2-201 + EN/IEC 61010-1
EMC Compatibility Acc. to EN 61000-6-2 / EN 61000-6-4 / EN61000-4-4 / EN61000-4-5
Safety Class 1 (equipment with protective earth connection)
Overvoltage Category II
Pollution Degree 2
Maximum Installation Altitude 2000m
Isolation Resistance > 10 MΩ at 500V DC
Isolation Test Acc. to EN/IEC 61010-2-201 + EN/IEC 61010-1
GA_Drawing_B2591-7-Front GA_Drawing_B2591-7-Isometric GA_Drawing_B2591-7-Rear GA_Drawing_B2591-7-Top
Schaefer_B2591-7_Datasheet.pdf

Find the Right Model

Model Number Input Voltage (Vac) Output Voltage (Vdc) Output Current (A)
product variant B2591-7 115V AC ±20% or 230V AC +15%/-20% (50/60Hz) 13.7V DC (adjustable 12 … 16V DC) 23A

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