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What is the replacement for the 8501 TO Intrinsically Safe Barrier Relay?

Issue:
Need a cross for the 8501 TO Intrinsically Safe Barrier Relay

Product Line: 
Relays and Timers

Environment:
8501 TO Intrinsically Safe Barrier Relay

Resolution:
The 8501 TO`s are obsolete with no replacement. Suggest contacting the R. Stahl Company at 1-800-782-4357 for a equivalent replacement product. 
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