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Difference between LUA contact blocks and LUF contact blocks in a TeSysU

What is the difference between the LUA contact blocks and the LUF contact blocks on a TeSysU motor starter?

Product Line:
TeSysU Simple Motor Starters

US Product

The LUA contact blocks are for signalling and will change state depending on mode or fault condition(s). These consist of one "Ready Condition" contact that operates with the handle and one "Fault Condition" contact that operates only when a fault is seen.  The LUF contact blocks are standard contact blocks and will change state with the poles.
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