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What is does the 1 suffix represent on Surgelogic MA modules?

Issue:
The difference in UL 1449 Type replacement SPD Modules 

Product Line:
Surge Protection Devices

Environment:
IMA

Cause:
Difference

Resolution:
The suffix "1" indicates a Type 1 UL 1449 product for connection on line or load of main vs. without a '1" indicates Type 2 UL1283 product for wiring to loadside only
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