Dwyer DDA21 is a non-spring return direct coupled actuator suitable for temperatures ranging from -22 to 122°F (-30 to 50°C). It has a power requirement of 110 VAC, 24 VAC, ±10%, 50/60 Hz, single phase, with an optional 230 VAC for DDA and 24 VAC for DDC. The enclosure material housing is NEMA 2 (IP40) and it comes with standard accessories such as baffles, setscrews, and gasket. It fits shaft diameters of 0.4" (10 mm) or 0.5" (13 mm) and has overload protection with a magnetic clutch. The angle of rotation is mechanically adjustable at 95° and the running time varies depending on the model. It also features position indication, direction of rotation, manual override, and control input options. With a life expectancy of 60000 full cycles and sound level below 45 dB, the DDA21 is a reliable actuator for various applications.