Siemens 5TT5800-2 — SENTRON Insta Contactor, 2 NO, 24 V AC Coil
It occupies a single 18 mm modular-width unit on a DIN rail, making it a compact fit for residential or light-commercial distribution boards where panel space is tight. The coil pulls 24 V AC (rated value), and the main contacts are rated for 230 V AC, 20 A — enough for lighting circuits, small motor loads, or general switching in a final-distribution sub-panel. The manufacturer notes that spacers must be provided between units for heat dissipation; with 1.7 W per pole in hot operation, stacking modules without gaps will raise internal temperature above spec. Switching capacity for incandescent lamp loads is listed at 1 000 W, so it handles a typical residential lighting circuit without derating.
Snaps onto DIN rail (1 MW unit, 18 mm wide). Depth is 71 mm, height 90 mm — fits standard 100 mm deep enclosures. The spacer requirement (per) means you cannot pack modules tight side-by-side; leave a few mm gap or install the manufacturer's specified spacers to keep internal temperature within limits. Supplementary devices can be installed on the contactor. This allows adding auxiliary contact blocks or other add-ons without replacing the base unit.