IL17569
Page Appendix-4
Effective June, 2001
13.3 Standard IEEE Device Numbers
Standard IEEE Device Numbers for power devices are covered under IEEE document, IEEE Standard Electrical Power System Device
Function Numbers and Contact Designations, # C37.2-1996, ISBN 0-7381-0732-8.
Some typical device numbers are used frequently within this document and throughout Cutler-Hammer’s product and other documentation.
For a complete list, please see the IEEE document referenced above.
Device
Description (Function)
Number
27.
Undervoltage Relay
Relay that operates when the voltage drops below a programmed value.
46.
Reverse-Phase,
Relay which functions when the polyphase currents are of reverse-phase sequence,
or Phase-Balance,
or when the polyphase currents are unbalanced or contain negative phase-sequence
Current Relay
components above a given amount.
47.
Phase-Sequence
Functions upon a predetermined value of polyphase voltage in
Voltage Relay
the desired phase sequence.
50.
Instantaneous
Relay that functions instantaneously on an excessive value of current, or on an exces-
Overcurrent, or
sive rate of current rise, thus indicating a fault in the apparatus or circuit being protected.
Rate-of-Rise Relay
51.
AC Time Over
Relay with either a definite or inverse time characteristic that functions when
Current Relay
the current in an AC circuit exceeds a predetermined value.
52.
AC
Device that is used to close and interrupt an AC power circuit under normal conditions
Circuit Breaker
or to interrupt this circuit under fault or emergency conditions.
55
.
Power Factor Relay
Relay that operates when the power factor in an AC circuit rises above or below a
predetermined value.
59.
Overvoltage Relay
Relay that operates when the voltage rises above a programmed value.
81.
Frequency Relay
Relay that operates when the frequency falls outside a programmed range.
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