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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.
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
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.
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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Phase-Guard will automatically reset whenever the cause of the fault has been corrected and balanced voltage is restored. All models include DPDT output relay with 30 amp contact rating. A two line display shows the current state of the relay.
Environment. Immunity to microbreaks. <= 10 ms. Electromagnetic compatibility. Conducted and radiated emissions class B conforming to CISPR 22 Immunity for residential, commercial and light-industrial environments conforming to EN/IEC 61000-6-1 Electrostatic discharge 6 kV level 3 contact discharge conforming to IEC 61000-4-2 Electrostatic ...
