Several plants currently have phase loss detectors, in their MCC and starters, but the design of some of them dates back to the 90s. Phase loss detection is a very good practice to reduce motor failures related to phase loss. It is not uncommon to have a fuse that burns on a set of 3 and to see our motor tried to operate with 2 phases. The very high current in the remaining phases warms the engine and prematurely damages the insulation. So there are several plants that have incorporated a phase lost relays into their specifications in a standard way. There are now new relays not more expensive than the old models and that do more like for example the unit PMD-575 from Macromatic. They also protect against phase reversal, a failure that can be very expensive if an engine is running on the wrong side. Their technology is more up to date, the current is measure more precisely thanks to its technology of measurement in True RMS value. It also incorporates under-voltage and over-voltage detection functions. Guaranteed 5 years it is compact and approved CSA, CUL and CE. The have Din rail mounting and its finger safe terminals make it an ideal candidate for your motor control panel. In addition, most of the functions are adjustable in level and time. If you want other options Macromatic offers a complete family with more or less function depending on your needs. From the very simple model like the PCP to the complex model with communication like the PC1MDUL.
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