In the last several decades the single-phase AC motors have utilized mechanical centrifugal switches to switch from start windings to main windings which have problems like tolerance build-up, mechanical fatigue, vibration, electric spark, etc. Under normal environment motor failures often come from the degradation of the mechanical switches. Electronic Centrifugal Switch (EMS) is a reliable solid-state switch that would duplicate the functions of the conventional centrifugal switch with additional benefits of the electronic device. Speed voltage /current and phase are constantly monitored by the ECS, and the internal ASIC will control the switch On or Off. At the cut-Off point, the motor speed normally accelerates to 60~80% of the synchronous speed (see Figure 1 torque-speed curve). When the motor encounters overload conditions or the motor speed decreases to approximately 20~40% of the synchronous speed, ECS reconnects the start CAP.
Features Small Package Long Life(1M cycle)
General Switch,Auto-Match different Motor
Wide Voltage Range 115V(90V-137V) 230V(198V-264V)
50Hz/60Hz applicable
Neither switching noise nor trembling of contacts
High compatibility with general-purpose motors as well as application-specific motors
Easy installation and maintenance, mounted on inside/outside standard motor frames
Sealed with epoxy resin or silicon rub, insensitive to dirt, dust, moisture, and vibration
Discharges starting capacitors
ROHS/CE/UL