The Zettler AZ9371T-1A-18D is an electromagnetic relay with a single pole single throw normally open (SPST-NO) contact configuration. It is rated for 10A at 277V AC and is designed to operate with an 18VDC control voltage (ucoil). It features a dielectric strength of 3,000V, a mechanical durability of 10,000,000 operations, and an electrical durability of 100,000 operations. Its dimensions are 35.8 x 35.5 x 21.5mm.