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RXZL520 and RUZL420 Difference

What is the difference between the RXZL520 and the RUZL420?

Product Line:

RPM Plug-in Relay

The RXZL520 is a sheet of 108 clip on markers that mount to the front of the Zelio miniature R type relays relay in the bottom left hand corner. The RUZL420 are clip on markers (1 unit but sold in lots of 10) for the sockets with separate contacts for the RUM relay line.
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