The 140-A20 and 140-MN-0400 are components from Allen-Bradley, designed for motor protection in industrial electrical systems. Here's a quick overview:

140-A20: This is an auxiliary contactor with a 2-pole configuration (2 NO contacts). It is rated for up to 600V AC and 10A, and is typically mounted on the left side of the main unit.

140-MN-0400: This is a manual motor starter with an adjustable current range of 2.5-4.0A. It provides thermal overload protection and fixed magnetic short-circuit protection. It is rated for 690V AC and has a breaking capacity of 25kA at 690V AC.