The 3RT2535-1NB30 by Siemens is a 4-pole contactor has no x2 and normally open (NO) x2 as the main contacts, alongside a normally open (NO) and Normally Closed (NC) auxiliary contact configuration. It is designed for use in switching and controlling an array of alternating current (AC) and direct current (DC) motors, resistive loads, lighting, heating, and other power asynchronous electrical applications. It is rated for UL, CSA and CE approval, designed for use in 24-800V AC circuits, and features an adjustable tripping time range of 0.02-8 seconds. In addition to its rigid enclosure construction, the contactor is equipped with a current monitoring relay and a mechanically interlocked auxiliary contacts.