Control Concepts, Inc., Putnam, CT, USA, manufactures electro mechanical, electronic and proximity zero speed switches. When driven from a critical shaft, a zero speed switch can be electronically connected to: Actuate a signal or alarm device Break a circuit to a motor Make a circuit to start auxiliary equipment Make or break a circuit to other electrical devices Signal a control station PLC
Go to: www.speedswitch.com  Buy directly from the factory or from Cascadia Instrumentation Inc.