GOOD

Model 460 (din-rail or surface mount) or model 201 A-AU (8-pin socket mount) Voltage/Phase Monitors are an inexpensive option; protects 3-phase motors from over/under voltage, phase loss, reverse phase, unbalanced voltage and rapid cycling. Without protection, each of these faulty conditions can cause motor windings to overheat and burn motor insulation - causing premature motor failure. Our units support universal voltage, offer adjustable unbalance % trip setting, trip delay and restart delay, plus a diagnostic LED.

See SymCom's Good, Better, Best publication for more details.

BETTER

Model 455 Voltage/Phase Monitor with optional Informer-MS Handheld Diagnostic Tool provides all the same voltage/phase protection as the 460/201A-AU, but with two added advantages: 1) It has a second set of voltage inputs for monitoring voltage on the load-side of the motor contactor to detect contact failure. 2) It keeps a history of the past 20 fault causes (including voltages and unbalance at the time of trip), which can be wirelessly downloaded and viewed via the optional Informer-MS hand-held diagnostic tool. Additionally, the Informer-MS can read real-time voltages per phase, voltage unbalance & more - ideal for troubleshooting.

BEST

Model 777 -P2 MotorSaver® (for industrial motors) or 777-KW/HP-P2 PumpSaver® (for pumps) Enhanced Overload Relay/Power Monitor, provides the same 3-phase voltage/phase protection as above, plus motor/pump protection from current overloads & underloads (broken shaft couplers or belts for motors and dry running for pumps), current unbalance and ground fault protection. Added features include an on-board display (for easy programming, real-time voltage/current readings and fault codes) and remote communications capability (for connecting to a remote monitor SCADA, PLC, or PC communications network via a communications module).