Dwyer DDB51-K is a Non-Spring Return Direct Coupled Actuator suitable for a temperature range of -22 to 122°F (-30 to 50°C). It features an accuracy of ±5% and is powered by 110 VAC or 24 VAC, with an optional 230 VAC available. The housing is made of NEMA 2 (IP42) enclosure material, with electrical connections via a terminal block. It consumes 5.5 VA power and includes standard accessories such as imitative baffles and a setting bracket. The actuator fits shaft diameters of 0.4-0.75" (10-20 mm) and has overload protection through a magnetic clutch. It offers a mechanically adjustable angle of rotation of 95°, with different running times based on the in-lb load. Additionally, it provides visual position indication, manual override via a push button, and control input options of two-position or floating for DDB and 4-20 mA or 0-10 VDC for DDD. With a life expectancy of 60000 full cycles, it operates quietly with a sound level of <45 dB.