A12B (Mag Amp Battery Charger)

The Magnetic Amplifier design battery charger/eliminator has an extremely high MTBF that meets the demanding requirements of applications such as switchgear, process control, oil and gas exploration.

These battery charger power systems are available in output DC voltages of 12, 24, 48 or 130 VDC with output DC currents of 3 to 400 amps.  It is used in the Utiliy/Switchgear, Oil Exploration, Process Control, and Railroad Signaling applications.

Special configurations available - Consult factory.

Instruction Manuals

Digital CAP System

Option 46 Series
Digital CAP System LCD

Option 03M
Electronic Voltage Sensing Relays

Option 04J
Equalize Timer

Option 04G & 04H
Manual Equalize Timer

Option 03N
Electronic Current Sensing Relays

Option 11L
Lighting Arrester

Option 03S
Low Voltage Disconnect

Instruction Manuals for Communication Cards


MODBUS (RS232/RS485/Ethernet)

SNMP & Web Browser (Ethernet)

21X MIB File

21P, 57T and 57U
DNP 3.0 (RS232/RS485/Ethernet)


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  • Magnetic Amplifier Circuitry
  • Separate Float and Equalize Potentiometers provide simple and precise DC Voltage calibration
  • Float/Equalize Mode Switching
  • Float and Equalize Lights
  • Automatic AC Voltage Compensation
  • +/- 0.5% DC Voltage Regulation
  • Fused AC input and DC output protects Battery and Charger/Power Supply
  • Analog DC Ammeter and DC Voltmeter
  • Current Limiting Circuitry prevents overload and provides current control from 50 to 120% of rated output (factory set at 115%)
  • Output Filtered (With or Without a Battery) - 30mV RMS for Single Phase Models and 100mV RMS for Three Phase Models
  • AC Power Failure Relay with Form "C" Contacts
  • AC Surge Suppression (MOV)
  • UL 1012 & C-UL Listed (UL 1481 Listing available)
  • 10-year Limited Warranty
AC Input Voltages
Single Phase 60Hz: 120, 208, 220, 240, 480 or 575
Single Phase 50Hz: 220/240, 380 or 415
Three Phase 60Hz: 208, 240, 480 or 575
Three Phase 50Hz: 220/240, 380 or 415
Voltage range: +/- 10% from nominal
Frequency range: +/- 5%
Power Protection
AC Fuse
DC Fuse
Current Limit
DC Output Amps and Voltages
DC Amps: 3 to 400 amperers
DC Volts: 12, 14, 48, 130VDC (Others available such as 32, 36 & 260 VDC)
Output Filtering (With or without battery)
30mV RMS for single phase models
100mV RMS for three phase models
DC Voltage Regulation
Plus or minus 0.5% of setting from no load to full load over the specified input voltage, frequency and ambient temperature ranges.
Operating Temperature
0 to 50 C (32 to 122 F)
Storage Temperature
-40 to 85 C (-40 to 185 F)
Relative Humidity
0 to 95% (non-condensing)
Exceeds 250,000 Hours
See Data Sheet for details
Floor or wall units are available. Mounting flanges are supplied as integral part of cabinet back plate on wall mounted models.
Pretreated with a seven stage iron phosphate wash, sealer and deionized rinse. Then coated with an environmentally safe and durable ANSI 61 gray Polyester TGIC Minite powder finish.
UL Battery Charger
File E 319318, Guide BBML
UL Std. No. 1012
C-UL Battery Charger
Std. C22.2 No. 107-2
UL Fire Alarm System Power Supply
File S2768, Guide UTRZ
UL Std. No. 1481
Must Specify Accessory Code 09A 24V output, 240V or less, 60Hz single phase input only

6 amp to 400amp

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