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Over-voltage Protection
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The relay has an integrated over-voltage protection circuit. The relay's load-power supplies require adequate protection against over-voltage errors from various causes.
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Search Logic:
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"Required" and "Must Not Have" criteria limit returned
matches as specified. Products with optional attributes
will be returned for either choice.
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Undervoltage?
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The relay trips when the voltage drops below the set point.
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Search Logic:
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"Required" and "Must Not Have" criteria limit returned
matches as specified. Products with optional attributes
will be returned for either choice.
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Differential Voltage?
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The relay responds to the difference between incoming and outgoing voltage associated with the protected apparatus.
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Search Logic:
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"Required" and "Must Not Have" criteria limit returned
matches as specified. Products with optional attributes
will be returned for either choice.
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Ground (Earth) Fault?
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Ground (earth) fault is any undesired current path from a point of differing potential to ground.
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Search Logic:
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"Required" and "Must Not Have" criteria limit returned
matches as specified. Products with optional attributes
will be returned for either choice.
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Phase Failure (Loss)?
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The relay monitors for voltage with the incorrect phase sequence, or one or more phases open.
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Search Logic:
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"Required" and "Must Not Have" criteria limit returned
matches as specified. Products with optional attributes
will be returned for either choice.
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Phase Reversal?
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Phase reversal is a change of one-half cycle or 180° in phase.
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Search Logic:
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"Required" and "Must Not Have" criteria limit returned
matches as specified. Products with optional attributes
will be returned for either choice.
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Phase Sequence?
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The relay monitors for correct phase sequence.
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Search Logic:
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"Required" and "Must Not Have" criteria limit returned
matches as specified. Products with optional attributes
will be returned for either choice.
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Phase Unbalance?
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The relay operates when the magnitude of one current exceeds the magnitude of another current by a predetermined degree. Voltage balance operates in a similar manner.
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Search Logic:
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"Required" and "Must Not Have" criteria limit returned
matches as specified. Products with optional attributes
will be returned for either choice.
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Power Factor?
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In AC power transmission and distribution, power factor is the cosine of the phase-angle between the voltage and the current.
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Search Logic:
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"Required" and "Must Not Have" criteria limit returned
matches as specified. Products with optional attributes
will be returned for either choice.
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Over-current Protection
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The relay has an integrated over-current protection circuit.
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Search Logic:
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"Required" and "Must Not Have" criteria limit returned
matches as specified. Products with optional attributes
will be returned for either choice.
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Undercurrent?
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The relay trips when the current drops below the set point.
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Search Logic:
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"Required" and "Must Not Have" criteria limit returned
matches as specified. Products with optional attributes
will be returned for either choice.
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Current Differential?
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The relay responds to the difference between incoming and outgoing current associated with the protected apparatus.
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Search Logic:
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"Required" and "Must Not Have" criteria limit returned
matches as specified. Products with optional attributes
will be returned for either choice.
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A Relay that operates when energized electrically at a particular frequency or within specific frequency bands.
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Overfrequency?
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The relay responds to an increase in the frequency of an alternating electrical input quantity.
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Search Logic:
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"Required" and "Must Not Have" criteria limit returned
matches as specified. Products with optional attributes
will be returned for either choice.
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Under Frequency?
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The relay responds to a decrease in the frequency of an alternating electrical input quantity.
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Search Logic:
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"Required" and "Must Not Have" criteria limit returned
matches as specified. Products with optional attributes
will be returned for either choice.
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Frequency Differential?
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The relay responds to the difference between the incoming and outgoing frequency of an alternating electrical quantity associated with the protected apparatus.
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Search Logic:
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"Required" and "Must Not Have" criteria limit returned
matches as specified. Products with optional attributes
will be returned for either choice.
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Time Delay
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Relays provide time delay on make, time delay on break, single shot, recycling, and interval timing functions.
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Search Logic:
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"Required" and "Must Not Have" criteria limit returned
matches as specified. Products with optional attributes
will be returned for either choice.
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Synchronous Check (Paralleling)?
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Synchronous check or paralleling relays sense the phase-angle displacement and amplitude difference between two voltages. They only permit paralleling when both voltages are equal and in-phase. Generator-to-generator, generator-to-bus (dead bus) and bus-to-bus (double dead-bus) are typical applications.
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Search Logic:
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|
"Required" and "Must Not Have" criteria limit returned
matches as specified. Products with optional attributes
will be returned for either choice.
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Current Sensing Range
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Current-sensing range applies to power (phase) and current-sensing relays.
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Search Logic:
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User may specify either, both, or neither of the limits in a "From - To" range; when both are specified, matching products will cover entire range. Products returned as matches will meet all specified criteria.
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Line Voltage Range
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Line-voltage range applies to power (phase) sensing relays.
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Search Logic:
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User may specify either, both, or neither of the limits in a "From - To" range; when both are specified, matching products will cover entire range. Products returned as matches will meet all specified criteria.
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Voltage Sensing Range
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Voltage-sensing range applies to power (phase), voltage, voltage/frequency, and paralleling (synchronous) sensing relays.
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Search Logic:
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User may specify either, both, or neither of the limits in a "From - To" range; when both are specified, matching products will cover entire range. Products returned as matches will meet all specified criteria.
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Line Voltage Mode
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Your choices are...
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Line to Line (L-L)
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Line to Neutral (L-N)
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Search Logic:
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All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
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Frequency Sensing Range
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Search Logic:
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User may specify either, both, or neither of the limits in a "From - To" range; when both are specified, matching products will cover entire range. Products returned as matches will meet all specified criteria.
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Supply Voltage Range
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The supply voltage range is the relay supply voltage.
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Search Logic:
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User may specify either, both, or neither of the limits in a "From - To" range; when both are specified, matching products will cover entire range. Products returned as matches will meet all specified criteria.
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Features
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Your choices are...
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Automatic Reset?
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The relay resets automatically after conditions return to normal.
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Latching Relay
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Relays are used for latching applications (e.g., latching limit controllers).
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Programmable Time Delay?
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The relay has a programmable time-delay feature.
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Sealed Relay
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Relays are sealed to prevent the ingress of contaminants, water, etc.
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Visual Indicator
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The relay has visual indicator such as a light-emitting diode (LED).
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Search Logic:
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All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
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Operating Temperature
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This is the full-required range of ambient operating temperature. This represents the surrounding air temperature limits.
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Search Logic:
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User may specify either, both, or neither of the limits in a "From - To" range; when both are specified, matching products will cover entire range. Products returned as matches will meet all specified criteria.
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