A75D/A75DE (SCR Charger)

The La Marche Model A75D/A75DE Series Battery Chargers/Battery Eliminator are engineered for the demanding requirements of Switchgear, Process Control and Oil Exploration to name a few. The A75D/A75DE battery charger is a solid state unit utilizing SCR technology and has ±0.5% regulation from no load to full load over the specified input voltage, frequency and ambient temperature range. The A75D/A75DE series is offered with DC output voltages of 24, 48 or 130VDC with DC output currents from 6 to 100 Amps. These chargers can be powered with 120, 208, 240 or 480 VAC. The current limit is factory set at 105% and is adjustable from 50 to 110%. The battery chargers are designed for dependable operation in harsh environments at temperatures up to 122o F (50° C). The unit is convection cooled and the components are designed to achieve MTBF in excess of 100,000 hours. The enclosures are very versatile. Some units can be wall, floor or rack mounted and others can be wall or floor mounted. See the Case Specifications chart on the other side of the Data Sheet for further details.


A75D/A75DE Data Sheet

A75D/A75DE Single Phase Instruction Manual

A75D/A75DE Single Phase Instruction Manual (w/ option 550)

A75D/A75DE Three Phase Instruction Manual


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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