To achieve the best performance from ALPHA-SORB (tm) transient protection devices, two parameters are matched.
1. Bus voltage must be at least equal to the buss voltage ( 12, 24 or 32 volt systems). Selection of the proper
voltage rating will provide the best transient protection.
2. Current rating for each voltage must be matched. Alpha Marine Systems offers -1 units designed for suppressing
the transients produced by low powered devices: pumps, etc. drawing less than 50 amps. The -2 units are designed
for high current alternators, motor generators and engine starters, all of which can produce transients particularly when
The use of the -2 high power units in low power circuits will not reduce the effectiveness of the protection.
It is just not as cost effective as proper matching. Use, however, of the low power -1 units in high current
circuits can cause an ALPHA-SORB (tm) or other system failure.
Proper application calls for:
1. Determining the source of the transient ( installation of the Alpha Marine Systems Trans-corder ( tm) will make this easy)
2. Estimate the maximum current drain of the device producing the transient and selecting either the -1 low current or
-2 high current protector.
3. Determine the operating voltage of the device producing the transient.
4. Select the power protection device form the table below and install the suppressor as close to the transient source as
possible. This will ensure maximum protection, reduce system noise and protect contactors and switches in the system.
On a typical vessel several transient sources may be found. Each should have it's own ALPHA-SORB (tm).
A less effective method of protection is to install a -2 device directly across the power input terminals of an instrument
to be protected. This may be the only way to provide effective protection. If this method is selected both Power and Ground leads must go directly to the ALPHA-SORB (tm) and no other grounds may exist as a current loop will be created which will bypass the protection device. Lead lengths must be kept short to eliminate lead inductance, thus ensuring the Full response speed of the device.
PART# BUSS TRANSIENT PEAK POWER AVALANCHE
VOLTAGE RESPONSE (NOTE 1) WATTS VOLTAGE
AS12-1 12 22.5V@ 67A 18.2kw 16V
AS12-2 12 35.1v@ 128A 54.6kw 21V
AS24-1 24 45.2v@33A 18.2kw 32V
AS24-2 24 45.0v@ 67A 36.2kw 32V
AS32-1 32 59.3v@ 25A 18.2kw 42V
AS32-2 32 66.0v@ 86A 36.4kw 42V
NOTE 1 Response time is typically 200 pico seconds ( 200 x 10 to the minus 12th power)
operating temperature is -40 deg C to 150 degrees C
Leakage current at rated voltage is less than 50 micro amperes.
Note 1; Transient responce 10x100 micro seconds. At 8x20 micro seconds the power rating is approximatly 10 times the above figures.
For information about EMP and lightning damage click on this link