Gould A133 is a control relay often used in industrial and commercial electrical systems to switch or control auxiliary circuits. It operates by energizing an internal coil that causes one or more sets of contacts to open or close, allowing control of separate power circuits from a low-power control signal. The relay is typically mounted in control panels or machinery and is used for functions such as sequencing, interlocking, and logic control. It can handle moderate control circuit loads and provides electrical isolation between the control and load circuits. This type of relay is common in motor control centers, automation systems, and industrial equipment where reliable auxiliary switching is required.