Siemens 5TT5041-2 SENTRON Insta Contactor — 40 A, 24 V AC/DC Coil
The Siemens 5TT5041-2 is a SENTRON Insta contactor with 3 normally-open and 1 normally-closed main contacts, rated for 400 V AC and 40 A. The coil operates on 24 V AC/DC, making it a direct fit for standard control voltages in industrial and commercial panels. The 40 A AC rating means it can switch resistive and moderate motor loads up to that current — sized for lighting banks, small compressors, or heater banks in a DIN-rail enclosure. At 3 modular width units (53.5 mm wide, 90 mm tall, 71 mm deep), it occupies three adjacent 18 mm slots on a standard DIN rail. The IP20 finger-safe housing is suited for enclosed panel mounting — not for washdown or outdoor exposure. The installation note calls for spacers between units to allow heat dissipation, so plan for a 4 W per-pole power loss when grouping multiple contactors in a row.