“This Harmony RXZ plug-in relay socket has a coil control voltage of 250V AC and has 4 changeover contacts 4PDT (quadruple pole double throw) with a rating of 10A.” “It has large choice of number of contacts for high rated current use with space-saving design.” “It helps to reduce the size of enclosures and increases machine reliability, you can mount nearly everywhere.” “It is compatible with plug in control relay.” “Easy installation and connect to the relay from its socket.” “Workability for hard-wired logic automated systems to complement the functions of industrial programmable logic controllers (PLCs).”