Siemens 5TT5002-2 SENTRON Insta Contactor — 2 NC, 230 V AC Coil, 24 V DC Control
The Siemens 5TT5002-2 is a SENTRON Insta contactor packing two normally-closed (NC) contacts in a single modular-width unit (17.5 mm). The coil pulls in on 230 V AC, but the control circuit accepts AC or DC — 24 V DC is the rated control voltage. It switches loads up to 20 A at 400 V, making it a fit for lighting or small motor circuits where a maintained-off state via NC contacts is the safety requirement.
The 230 V AC coil means this contactor is designed for direct connection to a phase-to-neutral or phase-to-phase 230 V supply — common in European panel builds. The 2 NC contacts are normally closed when the coil is de-energized; they open when the coil pulls in. That configuration is typical for fail-safe shutdown circuits where the load must be disconnected on loss of control power. IP20 protection means the contactor is protected against fingers touching live parts but not against moisture or dust ingress — it belongs inside a locked enclosure, not in a washdown zone. Depth is 71 mm, height 90 mm. Installation depth is 64 mm. Width is 17.5 mm, one modular unit.
One modular width (17.5 mm). The spacer requirement is a real constraint — if you pack four of these side-by-side without the recommended air gap, the cumulative 1.7 W per pole (6.8 W total) can push the internal temperature above the contactor's rated ambient. Plan for at least 5 mm between adjacent devices, or use the Siemens spacer accessory. The AC/DC control input simplifies wiring: a 24 V DC PLC output can drive the coil directly, or a 230 V AC control signal from a pushbutton station. No separate interposing relay needed if your controller has a 24 V DC output rated for the coil inrush.