The B11-51-20.0A-01-31AL-S is a part manufactured by Sensata Technologies, a global leader in sensor and electrical protection solutions. This part is an outdoor environment-rated AC motor starter, made up of a combination motor contactor, thermal overload protection device, and an enclosure. It is suitable for use in motor load applications, and it is capable of controlling motor loads up to 20 amp, with 3-pole contactor configuration. The 31AL-S is NEMA 4, IP65 rated for outdoor environment applications and features a tamper-resistant, corrosion resistant weatherproof enclosure. This part can be used in a variety of commercial and industrial applications.