Phase Failure Relay|Phase Sequence Relay

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[garbo]

Years ago I worked at a moneymaking newspaper while making huge profit they always did everything on the cheap. They had two rooftop HVAC units with each having two 25 ton refrigerant compressors. I told them to purchase under voltage/phase loss relays like the ones you are showing. Units sat at least 50' from building edge so they had to hire a 150' crane at $5, 000 a pop to get the burnt out compressor to the parking lot and replacement unit into unit. After pissing away $20, 000 they finally spent less then $600 for four of these. They should be in all three phase equipment.

[JaykeSapalaran-iqqs]

Great video information ❤ please make calculation for setting.

[michaelcostello]

Is phase voltage the voltage between any phase and earth ? or is it the voltage between any 2 phases