The 440R-S845AER-NNL is a specialized safety relay designed for speed monitoring applications. It features 5 normally closed (N.C.) contacts, 2 N.C. contacts, and 1 normally open (N.O.) + 1 N.C. input configuration. The relay includes 4 solid-state auxiliary outputs with N.O. contacts. Note: Factory warranty does not apply, but the product comes with a 2-year warranty from RADWELL.