The ER Series electric motor actuators are high quality, economically priced, reversing quarter-turn actuators ideal for automating ball valves. They offer compactness and a rugged design to develop high torque in minimum space. They are available in thirteen listed sizes from 100 in-lbs to 14040 in-lbs torque. The ER Series has many standard features, as well as a full range of optional features. Terminal strips in all sizes allow easy and efficient wiring. A wiring diagram is always furnished inside the actuator housing. Most sizes / housings feature easy manual over-ride. The optional auxiliary limit switches are used for sequencing operations, control of other equipment, or additional signaling devices, independent of the power supply.