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We have used the phase failure relays manufactured by Taylor for the past 30 years. Currently, use both the Taylor PD and PND phase failure relays in our current style switchboards. See the attachments for the wiring diagrams, specifications, operating instructions etc. Released for: Schneider Electric USA.
All models include DPDT output relay with 30 amp contact rating. A two line display shows the current state of the relay. An event log records the 25 most recent voltage faults and the date and time they occurred.
Phase failure relays are often used to control a shunt trip circuit breaker. When this is done, care must be taken to insure that the shunt trip circuit always has an adequate source available. This can be accomplished by using the diagram below. If a phase failure occurs on L2 or L3, the shunt trip coil will draw power from L1 through the control
Model P – On this device the master relay is normally ENERGIZED. When Conditions are normal and 3 phase power applied master relay connections are 1 to 2. When a phase loss occurs master relay will de-energize and contacts 1-3 will be closed. (1-2 will be open) Model PND – On this device the master relay is normally DE-ENERGIZED. When
The Phase-Guard is a phase voltage balance monitoring device designed to protect three phase motor equipment from Phase Loss, Reverse Phase, Overvoltage, and Low Voltage (undervoltage) faults.
Maximum switching voltage. 250 V AC 250 V DC. Minimum switching current. 10 mA at 5 V DC. Supply voltage limits. 183...528 V AC. Control circuit voltage limits. 12 % + 10 % Un.
One Phase-Guard relay can be used to protect equipment in a small plant from single phasing from an outside source. The Phase-Guard incorporates an automatic reset feature that makes it ideal for protecting unattended motors actuated by sensory controls.
