Air Compressor Magnetic Motor Starter by Eaton B27CGF30B040 – 5hp, 208-230v/1ph/60hz, 24-40amps - 1312101279
This is an Eaton / Cutler Hammer B27 single phase definite purpose magnet motor starter with built in contactor and overload relay.
This is manufactured by Eaton / Cutler Hammer. The B27CGF30B040 is specifically used on 5hp air compressors that are running on 208/1/60hz power or 230/1/60hz power. The overload is adjustable between 24 and 40amps. This was specifically paired with several Chicago Pneumatic and Quincy air compressors, as well as piston compressors from NAPA, BelAir, and Atlas Copco. This part may be shown in your parts book as 1312-1012-79 or 1312 1012 79.
Featuring components that meet IEC design and UL horsepower ratings and design standards, Eaton mag starters are UL Recognized and use CSA Certified contactors. No internal starter heaters are required. Eaton single phase magnetic starters are shrouded or use finger proof terminals to reduce the possibility of electric shock.
Single phase motor starters provide overload protection to electric compressor motors. This is similar to a surge protector for your compressor – a motor starter adsorbs the incoming power before it is sent into your electric motor. This helps to prevent costly damage to the windings from over-currents and temperature increases. A magnetic starter is required for all three phase compressors and any single phase application where there is no overload protection for the motor. Eaton B27 starters are pre-wired from the factory. The internal Eaton part number for this starter is 3-4234-0093A