A18J/A20R (Auto Constavolt Charger)
A18J / A20R
Engine Starting Battery Chargers
Automatic Battery Chargers for Engine
Starting Batteries
The La Marche models A18J and A20R Battery Chargers are
completely automatic and are designed for continuous
operation on unloaded Engine Starting Batteries. They are
intended for mounting near the Engine Generator Set and to
be permanently connected to the battery and AC lines.
The A18J and A20R Battery Chargers are simple to operate.
There are no external controls or adjustments to be made
once the battery is permanently connected. The models are
available with either 120, 208 or 240VAC single phase input.
All models are equipped with convenient AC input taps to
adjust the output voltage where low or high level AC lines are
present.
Model Shown: A18J-3-12V-A1
Standard Features
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Optional Feature
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Silicon diode full wave rectifier design
Automatic operation
AC input fusing and DC output auto-reset breaker protects battery and charger
Automatic surge protector
Flush mounted 5% accuracy analog DC ammeter
AC input voltages of 120, 208 or 240VAC, 50/60Hz, single phase
No RFI (Radio Frequency Interference) emitted
Simple operation - no external controls, switches or moving parts
Charger design prevents battery from discharging if AC line fails
Complete isolation of the AC line from the DC charging circuit eliminates the danger
of high voltage shock to personnel on ungrounded equipment
CSA Approved
2-Year Warranty
03A - DC cranking disconnect relay
MADE IN U.S.A.
Specifications subject to change without notice
P25-DSA18J/20R-1
ECN 19024
02-11
La Marche Mfg. (A U.S. Company)
106 Bradrock Drive, Des Plaines, IL 60018
Tel: 847.299.1188 Fax: 847.299.3061
sales@lamarchemfg.com
www.lamarchemfg.com
Volts
2
6
A18J-2-6V
Battery Cells Breaker
(Lead Acid)
Size
3
A
120
D
208
B
240
AC
Input
DC
Output
Overall Dimensions
WxDxH
Case No.
Amps
Cable Entry
(When Facing Unit)
Mounting
AC Input Current Draw
@ 100% (Load)
DC Output
Model Number
4
Shipping
Weight
lbs
kgs
13
5.9
13
5.9
15
6.8
16
7.3
16
7.3
1
A18J-3-12V
3
A20R-4-24V
4
A20R-5-24/32V
12
6
24
12
24/30/32
12/15/16
30/32/36
15/16/18
5
5.125” x 7.125” x 11.250”
Bottom Front
Wall
130 x 181 x 286mm
6
2
1
02
1
5
A20R-5-30/36V
No. 02 Case Drawing
. Environmental:
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
. NEMA 1 enclosure ANSI 61 gray
baked enamel paint
Model Number Nomenclature
Ordering Information
A18J - 3 - 12V - A 1 - ( ) - ( )
Model Number
DC Amps
DC Volts
When ordering, please specify:
AC Voltage Code
A - 120
B - 240
D - 208
AC Voltage Code
AC Phase Code
Battery Cell Range
Factory Assigned
Accessory Code
- La Marche Model Number A18J or A20R
- Input Voltage
- Number of Battery Cells
- A.H. Capacity of Battery
AC Phase Code
1 - Single Phase
- Allowable Recharge Time from
Full Discharge (where applicable)
- Optional Accessory (Option #03A
Cranking Disconnect Relay if desired)
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