The Siemens 5TT5032-2 is a SENTRON Insta contactor with a 2 NO + 2 NC contact configuration, rated for 400 V AC and controlled by a 24 V AC/DC coil.
Rated at 400 V AC, this contactor handles line-to-line voltages common in three-phase industrial and commercial installations — think motor feeders, lighting circuits, or heating loads within that voltage class. The 24 V AC/DC coil means the control signal can come from a PLC output card (24 V DC) or an AC control transformer, giving flexibility in panel design. The 2 NO + 2 NC contact set provides one normally-open and one normally-closed pair for each pole, which is typical for switching a load while simultaneously signaling its state back to a controller.
Installation and Thermal Management
The manufacturer explicitly notes that spacers must be provided between adjacent devices to ensure adequate heat dissipation. With a power loss of 2.2 W per pole under rated AC conditions in hot operating state, the contactor generates measurable heat; stacking units without airflow gaps can lead to premature thermal degradation. Plan for at least a few millimeters of separation when populating a DIN rail.