74
Alarm relay
Provides an electrical alarm output for a documented monitored condition.
Protection functions
Protection functions · 74TCM
Trip-coil monitoring
Monitors the electrical integrity of a documented breaker trip-coil circuit.
SLD / Schematic · 74TCM
What it represents
Monitors the electrical integrity of a documented breaker trip-coil circuit.
The drafting record should connect this function to the trip supply, coil, supervision resistor and breaker auxiliary contacts, then trace the trip-circuit unhealthy alarm and monitoring-device terminals. Keep the complete designation and equipment tag together so that the SLD, relay logic and terminal schedule describe the same implementation.
The cited mapping is a public manufacturer example (Eaton ETR family). Suffixes are not universal equivalences across products, and this reference supplies neither a protection setting nor certification of the selected scheme.
How to read it
- Identify the trip supply, coil, supervision resistor and breaker auxiliary contacts.
- Trace the trip-circuit unhealthy alarm and monitoring-device terminals.
Information to show or reference
- Label the trip supply, coil, supervision resistor and breaker auxiliary contacts.
- Cross-reference the trip-circuit unhealthy alarm and monitoring-device terminals.
- Retain the complete suffix, selected device tag and manufacturer manual revision.
A distinction that matters
Trip-circuit monitoring detects a circuit condition; it does not prove the breaker mechanism can interrupt fault current.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
ETR-4000 and ETR-5000 transformer protection function tables
Public primary-source function or application mapping used to identify this designation; wording and drafting notes are original.
IEEE C37.2-2022: power-system device function numbers
Device-number and suffix convention. This page is not a reproduction of the full licensed standard.
About this graphic
This illustration was authored independently by Elora Grid to explain the concept. It is not reproduced from a customer drawing, an official standard graphic or a manufacturer CAD file. Its correspondence to an exact IEC or IEEE symbol identifier has not been certified.
SVG and DXF downloads contain this original artwork. DXF uses unscaled drawing units; a GA envelope supplies no product dimensions, clearances or fabrication information. Original artwork is available under CC BY 4.0. Third-party references retain their own terms.
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