A77D/A77DE (Micro Processor Controlled SCR Charger)

The La Marche Model A77 Series Battery Charger is engineered for the demanding requirements of Switchgear, Process Control, Oil Exploration and other DC power applications. Powered by Microprocessor Controlled SCR technology, the A77 Series Battery Charger / Battery Eliminator has ±0.25% DC voltage regulation from no load to full load over the specified input voltage, frequency and ambient temperature ranges. These chargers are available in DC output voltages of 24, 48, 130, and 260 VDC with DC output currents from 6 amps and above. Consult factory for any special input and output requirements not mentioned above. The La Marche A77 charger provides value added features such as AC/DC breakers, easy to read LCD display with text readout alarm LED’s and form “C” alarm contacts. Communication options are available to remotely monitor and control the charger using DNP3, Modbus, IEC 61850 and SNMP protocols. The SNMP option features easier and faster charger setup and configuration using a web browser. Designed to meet NEMA PE5 and UL 1012 safety standards.


A77D/A77DE Data Sheet 

A77D/A77DE Instruction Manual

A77D/A77DE Brochure

Stationary Battery Charger Applications



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A75DE - Filtered Battery Charger / Battery Eliminator
A75D Unfiltered Battery Charger 
SCR Technology
Automatic AC Voltage Compensation
AC & DC Surge Protection (MOV)
AC Input Breaker / DC Output Breaker
Internal Temperature Compensation
Float / Equalize Mode Switch
Separate Float and Equalize Adjustments
Adjustable Current Limit 50 to 110% (factory set at 105%)
+/- 0.5% DC Voltage Regulation
load Sharing
LCD Display for DC Voltage, DC Current & Alarms 
LED Indicators
- Float / Equalize 
- AC "ON"
- AC Failure
- Summary Alarm
- Low DC Current
- Over Load / Current Limit
- Low DC Voltage
- Battery End of Discharge
- High DC Voltage
- High DC Voltage Shutdown
- Positive & Negative Ground Detection
Remote Annunction 2 Form "C" Contacts
- AC Failure
- Summary Alarm ( See Optional Accessories for Additional Alarm Contacts)
Equalize Timer - adjustable from 1-144 hours with five selectable modes of operation (manual, automatic every 7, 14 or 30 days and equalize after sensing a low DC voltage)
UL 1012 & CUL (Three phase units pending UL approval)
3-Year Warranty
AC Input Operating Range
Voltage range: +10, -12% from nominal
Frequency range: 60Hz +/-5% (50Hz Consult Factory0
Single Phase Voltages
120, 208, 240, 480, or 600VAc (Tap selectable 120/208/240 on units up to 25 amps output. All other units must specify single input voltage)
Three Phase Voltages
208, 240, 480 or 600VAC
DC Ouput
24, 48 & 130VDC
6 to 500 amps
Output Filtering (A75DE Models) with or without batteries
Single Phase: DC output filtering 30mV rms
Three Phase: DC output filtering 100mV rms
DC Voltage Regulation
Steady-state +/-% of setting from no load to full load over the specified input voltage, frequency and ambient temperature ranges
Dynamic Response (On Battery)
Maximum Voltage Transient will not exceed +/- 5% of initial steady-state voltage for a step change from 20 to 100% of the full rated load. Recovery to steady-state voltage regulation does not exceed 200ms and all transient behavior disappears within 500ms.
Audible Noise
Less than 65dBA at any point 5 feet from any vertical surface of the enclosure
Load Sharing
Load sharing terminal located inside of unit. When connected, identical La Marche A75D/DE units are forced to share the load within +/-5% for individual unit outputs greater than 15% of the rated output.
Current Walk-in
The output current will gradually increase after the charger is turned on, eliminating surges and overshoot
Current Limit
Electronic current limiting control circuitry provides for an adjustable value of 50 to 110% of the rated output current. Factory set at 105%
AC Breaker
Single Phase units are equipped woth a 2-pole circuit breaker (10KAIL @ up to 240VAC / 14KAIC 480 / 600 VAC)
Three Phase units are equipped with a 3-pole circuit breaker. (10KAIC @ up to 240VAC / 5KAIC 480 / 600 VAC)
DC Breaker
Standard units are equipped with a 2-pole circuit breaker. (7.5KAIC @ 24/48VDC & 5KAIC @ 130 VDC)
Operating Temperature
0 to 50C (32 to 122F)
Storage Temperature
-40 to 85C (-40 to 185)
Relative Humidity
0 to 95% (non-condensing)
Convection Cooled
Overall dimensions and weights are listed on the last page of the data sheet. Case specifications are subject to change due to innovative product development and design. When space requirements are critical, please consult the factory.
Floor, wall or rack mounting is available; see case specifications
Pretreated with 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

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