This mercury activated, wide-angle pump switch provides automatic control of smaller pumps innon-potable water and sewage applications. Although this switch is not sensitive to rotation, it is affected by turbulence and should be mounted in a non-turbulent location. The Junior Super Single pump switch is not recommended for use with motor contactors or relays because the motor contactor or relay may experience chattering. A Super Single or Double Float pump switch would operate more efficiently in these installations.