Siemens 5TT5850-0 SENTRON Insta Contactor — 4 NO, 230 V AC Coil
The Siemens 5TT5850-0 is a SENTRON Insta contactor with 4 normally open (NO) contacts, designed for switching loads on 230 V AC control circuits and up to 440 V mains. The 230 V AC coil pulls in reliably; the 4 NO contact set handles resistive loads such as incandescent lamp banks up to 5000 W. Rated for 63 A at 400 V, this is a panel-mount contactor sized for lighting, heater, and general switching duty in commercial or light industrial distribution boards. The 5TT5850-0 occupies 3 modular width units (54 mm wide) on a DIN rail, with a depth of 71 mm and height of 90 mm. IP20 finger-safe enclosure suits installation inside a sealed panel. The manufacturer notes that spacers are required between units for heat dissipation — factor that into panel layout when stacking multiple contactors. Supplementary devices (auxiliary contact blocks, suppressors) can be added via the product extension interface. Power loss per pole runs 8 W in hot operating state at rated current — a consideration for thermal budget in a densely packed enclosure. The contactor is AC-only for both coil and main circuit; no DC rating is specified. With 0 NC contacts, this is a straight make-only switching block.
The 3-module width (54 mm) matches the footprint of a 3-pole MCB, allowing side-by-side placement with SENTRON breakers in a distribution board. The 71 mm depth leaves clearance for wiring ducts behind the rail. Spacers between units are mandatory — do not skip them; the contactor relies on convective airflow between bodies to shed the 8 W per pole. The 4 NO contacts are electrically isolated from the coil circuit. Wire termination accepts standard screw-clamp terminals; torque specifications follow Siemens SENTRON installation guidelines. The IP20 housing requires the panel door to provide the environmental seal.