Siemens Building Technology S55155-A111 Control 321042-401 it functions as a universal

it functions as a universal wall cover plate for any device fitting within its 4 3/4" x 3 5/16" footprint

Provided with wire leads and two distinct cover plates

Built with a 1-inch NPT port size and a robust forged brass body

Designed as a direct drop-in replacement for the S301D2COMB-ME

Siemens Building Technology S55155-A111 Control 321042-401 it functions as a universalThe Siemens S55155 A111 is a high performance Powermite MT Series electronic actuator designed for precise 0 10 Vdc proportional control in demanding HVAC applications. Engineered for seamless integration with MT Series terminal valves, this spring return actuator provides a nominal force of 300N (67 lbf), ensuring reliable fail safe positioning during power loss. Operating on 24Vac, the unit features a linear 7 32 inch (5. 5mm) stroke and a rapid