Grayhill's spring return rotary switches are designed for applications requiring momentary positions, such as hold-to-test and hold-to-calibrate scenarios. These switches feature a spring mechanism that returns the contact to a normal or detent position when the rotational force is released. Available in various series (08, 09, 42, 44, 50) and configurations, they offer flexibility in design and functionality. The switch's construction allows for multiple positions, with a basic two-position arrangement always included. Electrical ratings are consistent with conventional switches, with a limited operational life of 10,000 cycles (25,000 cycles for Series 50) due to the spring arrangement. Dimensions are similar to conventional types, with slight variations in shaft flat orientation for specific series and configurations.