interface plug in relay, Harmony Electromechanical Relays, 10A, 1CO, with LED, lockable test but to n, 230V AC

"This Harmony RXG plug-in relay socket has a coil control voltage of 230V AC and has 1 changeover contact SPDT (single pole double throw) with a rating of 10A." "It has large choice of number of contacts for high rated current use." "It also offers lockable test button and LED indicator." "It helps to reduce the size of enclosures and increase machine reliability, you can mount nearly everywhere thanks to its 16mm width." "Workability for hard-wired logic automated systems to complement the functions of industrial programmable logic controllers (PLCs)." "Status display with LED, clearly signal both in the day and night."