LVD Series
Panel Mounted Low Voltage Disconnect
DC Solid State Switches
Crydom LVD Series Solid State Switches were developed to offer the advantages of Crydom’s thermal
management technology in a switch that monitors a system’s battery voltage and disconnects the battery from
the system when it’s voltage falls below a preset low voltage value.
FEATURES
Wide range of output current ratings and control set points
MOSFET DC switching technology
Industry standard package
Ambient temperature compensated
MOUNTING INSTRUCTIONS
Please read all installation instructions before using your LVD Series switch.
Choose one of the two mounting options and follow the instructions.
Mounting on Heat Sink
Select adequate heat sink (see thermal derating curves)
Be sure to use thermal pad/grease between LVD switch and the selected heat sink
Align SSR tabs with heat sink surface and screw both top and bottom sides. Recommended
torque is 20 in lb (2.2 Nm)
Mounting on Panel
Locate the panel section on which the LVD switch will be mounted on
Be sure to use thermal pad/grease between LVD switch and the panel
Tab holes have a diameter of 0.125 in (3.2 mm). You will need two screws no longer than that to
mount the LVD switch onto panel
Align LVD switch tabs with panel surface and screw both top and bottom sides. Recommended
torque is 20 in lb (2.2 Nm)
PART NUMBER NOMENCLATURE
Max DC Output Voltage
Series
Required for valid part number
For options only and not required
for valid part number
75: 3-75 Vdc
Control Set Points
A:18 Vdc max., Hysteresis 11.0-11.5 Vdc
B:18 Vdc max., Hysteresis 11.5-12.0 Vdc
C: 18 Vdc max., Hysteresis 12.0-12.5 Vdc
D:36 Vdc max., Hysteresis 23.0-24.0 Vdc
E: 36 Vdc max., Hysteresis 24.0-25.0 Vdc
F: 36 Vdc max., Hysteresis 25.6-26.6 Vdc
Output Current
40: 40 Amp
60:
80: 80 Amp
100: 100 Amp
4075 ALVD
60 Amp
Options
H: Thermal Pad
H
Rev: 111710
LOAD
BASIC WIRING
-2+
1
-
+
4
DC Input
Maximum Recommended Terminal
Screw Torque [in/lbs] (Nm)
Input 8-10 (0.9-1.1) / Output 18-20 (2.0-2.2)
Input Terminal Wire Capacity
12 AWG (2.5 mm)
Output Terminal Wire Capacity
Select wire size depending on current
TYPICAL LVD CONNECTION
-2+
1
LOAD
-
4
(A)
When wired as above the maximum battery voltage is limited to 36 Vdc
(B)
Typical LVD Connection Wiring diagram does not feature electric isolation
between Input (1, 2) and Output (3, 4) terminals
(A, B)
+
BATTERY
+
3
WARNING
RISK OF MATERIAL DAMAGE AND HOT ENCLOSURE
• The product's side panels may be hot, allow the product to cool before touching.
• Follow proper mounting instructions including torque values.
• Do not allow liquids or foreign objects to enter this product.
Failure to follow these instructions can result in serious injury, or equipment damage.
DERATING CURVESWIRING DIAGRAMS
50
+VDC
3
HAZARD OF ELECTRIC SHOCK, EXPLOSION OR ARC FLASH
•
Turn off power supply before working on this equipment.
Failure to follow these instructions will result in death or serious injury.
40
30
20
10
Power Dissipation [W]
0
10 20 30 40 20
0
Load Current [Arms] Ambient Temperature [°C]
90
80
70
60
50
40
30
20
Power Dissipation [W]
10
0
20
0
40 60 80 20
Load Current [Arms]
DANGER
40 Amps
0.5°C/W
1°C/W
2°C/W
3°C/W
No Heat Sink
80 Amps
1°C/W
2°C/W
3°C/W
No Heat Sink
Ambient Temperature [°C]
40 60 80
0.5°C/W
60
40
80
70
60
50
40
30
20
Power Dissipation [W]
10
0
20
0
Load Current [Arms] Ambient Temperature [°C]
100
90
80
70
60
50
40
30
20
Power Dissipation [W]
10
80
Rating - Heat Sink part number
0.5°C/W - HS053
1°C/W - HS103/HS103DR
2°C/W - HS201/HS201DR
3°C/W - HS301/HS301DR
0
200
Load Current [Arms]
60 Amps
0.5°C/W
1°C/W
2°C/W
3°C/W
No Heat Sink
40 60 20 40 60 80
100 Amps
0.5°C/W
1°C/W
2°C/W
3°C/W
No Heat Sink
60
40
100
80
20 40 60
Ambient Temperature [°C]
Rev: 111710
80
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