Controlled Ferroresonant Technology

DC Volts: 12V, 24V and 48V
DC Amps: 15 to 400 Amps

Single Phase: 120VAC, 208VAC, 220VAC, and 240VAC
Three Phase: 208VAC, 240VAC, 380VAC, and 480VAC

Fire Suppression
5G / 4G / Datacom
Radio Base Stations/ Cell Sites
Mobile Switching Center (MSC)
Distributed Antenna Systems (DAS)
Microwave Transmission / Switches
Fiber Optics / FTTX
Individual Base Transceiver (BTS)


The La Marche Model A36D Controlled Ferroresonant Rectifier/Power Supply has many inherent advantages such as voltage regulation, high efficiency, high power factor and short circuit protection. These chargers provide separate adjustable voltages for floating or equalizing lead or nickel-cadmium cells. An equalize switch is located on the front panel of the charger for manual activation or a multi-mode electronic timer can be used for automatic activation. Steady state output voltage remains within +/- 1/2% of the setting from no load to full load and for AC input voltages within +/- 10% of the nominal input voltage. The Model A36D is internally filtered to be no greater than 32dBrn ("C" message weighting) and 30 millivolts RMS for all conditions on input voltage and output load with or without batteries connected. This allows the A36D to be used as a battery eliminator.

• One Pole DC Output Breaker / Single Phase Units
• Output Fusing / Three Phase Units
• Automatic DC Voltage Regulation
• Automatic AC Voltage Compensation
• Float/Equalize Mode Switch
• Equalize Timer
• AC & DC Surge Protection (MOV’s)
• AC Input Circuit Breaker
• Remote Equalize and Sensing
• Output Load Current Sharing
• Internal Temperature Compensation
• U.L. 1012, U.L. 1481
• 5-Year Limited Warranty

AC VoltageVoltage range: ±10% from nominal
Frequency range: 60 Hz or 50 Hz ±5%
Single Phase models: 120VAC, 208VAC, 220VAC, and 240VAC
Three Phase models: 208VAC, 240VAC, 380VAC, and 480VAC
DC OutputDC Amps: 15 to 400 Amps
DC Volts: 12V, 24V and 48V
Output Filtering: 30m Vrms
EfficiencyUp to 90%
Power FactorUp to 0.95
DC Voltage Regulation Steady-State±0.5% of the setting from no load to full load over the specified input voltage, frequency and ambient temperature ranges
Dynamic Response (On Battery)Voltage transient < ±5% over a step change in the load from 20% to 100%
Recovery Time < 200mS
Audible NoiseLess than 65dBA at any point 5 feet from any vertical surface of the charger / power supply.
Voice Band Noise FilteringLess than 22dB when tested according to REA Form 524. All A36D units are filtered to 32 dBrn "C" with or without batteries connected.
Load SharingIdentical La Marche A36D units, when connected in parallel, are capable of sharing the DC load within ±5% for individual unit outputs greater than 5% of the rated output. Two sets of form "C" contacts are provided to indicate when connected rectifiers are capable of loadsharing.
Temperature Compensation5 step curve with an average slope of -0.001v/ cell/C°
Remote EqualizeWhen Remote Equalize feature is enabled, switching one A36D charger into Equalize mode would switch all other parallel A36D chargers, in the system, into Equalize mode
Current Limit ProtectionElectronic Current Limit circuit with an adjustable range from 90% to 115%. A36D has an inherent magnetic current limiting feature to protect against short circuits.
Current Walk In ProtectionOutput current will gradually increase after the charger is turned on eliminating surges and overshoot.
AC Breaker ProtectionA two pole breaker, on single phase units opens both legs of the AC service to 208 and 240. Breaker opens phase side of 120 VAC service. A three pole breaker is supplied on three phase units.
DC Breaker / DC Fuse ProtectionA single pole output breaker is supplied as standard on single phase units. A DC Fuse is standard on three phase units.
Alarm Relay ContactForm "C" Alarm Contacts for: AC Power FailureHigh Voltage ShutdownHigh DC VoltageLow DC VoltageLow CurrentSummary Alarm
MEAN TIME BETWEEN FAILUREThe mean time between failure (MTBF) as tested per the Bell Communications Standard TR-TSY-000332 is 225,000 hours at 50°C
REMOTE MONITORINGForm "C" Alarm ContactsWith optional Communications Card:-Connect to SCADA System-Web Monitoring-Alarm / Notification E-mails
ENCLOSURESPretreated 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
Operating Temperature0 to 50 C
Storage Temperature-40 to 85 C
Humidity0 to 95% Relative Humidity (Non-Condensing)
CoolingConvection Cooled

Breakers and Protection012DC Breaker - 1P
Communications21JIEC 61850 Ethernet
21PDNP3.0 Communications RS232/RS485/Ethernet
21QModbus Communications RS232/RS485/Ethernet
21SModbus RTU Serial Data Port RS232/RS485
Controls11WExternal Temperature Probe 24 Feet
11YExternal Temperature Probe 100 Feet
Display550Digital Controller with LCD Display
551Digital Controller with VFD Display
Miscellaneous09AUL 1481 Label (Fire Alarm). Available For 48V 60Hz Models Only.
09CI.D.TAGS (Black/White/Black)
09VI.D.TAGS (White/Black/White)
Wire Markers, Documentation & Special Wiring09WHeat Shrinkable Wire Markers With Electrical Schematic