This general purpose switch package provides a complete solution for automatic filling or emptying of a tank between two adjustable level switch points with a 10A latching compact relay controller for pump or valve actuation. The product is typically selected for atmospheric day tank, process vessel and waste sump applications. Specify the appropriate sensor technology and assembly dimensions. The AC powered relay controller has a latching 10A relay, adjustable time delay, LED indicators and NO or NC invert switch.