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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.
The most important feature offered by a solid-state overload relay (SSOLR) is phase loss protection. When a phase loss causes a significant current increase in the remaining phases of the motor circuit, there is a major increase in rotor current that can cause motor damage.
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
A9E21180. Monitors phases and the presence of voltage on the 3 phases of a 3 phase circuit power supply. Indicates any phase loss or inversion. Supplies one fail-safe change-over contact. Parameter setting is done on the front panel by direct scale using a screwdriver. Compatible with 35mm symmetrical DIN rail.
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.
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