86
Lockout
A lockout function or device with the documented reset and blocking behaviour.
Protection functions
Protection functions · 94
Tripping or trip-free relay
Initiates a tripping action or provides the trip-related logic described in the scheme.
SLD / Schematic · 94
What it represents
Initiates a tripping action or provides the trip-related logic described in the scheme.
In a drafting package, connect this reference to the protection initiation and trip-relay supply. The associated drawing should trace the breaker trip coils and auxiliary trip contacts; the number identifies the role and does not specify the terminal arrangement, ratings or operating settings.
How to read it
- Identify the protection initiation and trip-relay supply.
- Trace the breaker trip coils and auxiliary trip contacts.
Information to show or reference
- Label the protection initiation and trip-relay supply.
- Cross-reference the breaker trip coils and auxiliary trip contacts.
- Identify the device tag, manual revision and logic drawing that define this implementation.
A distinction that matters
A trip relay 94 need not have the latching reset behaviour of lockout device 86.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
SecoGear medium-voltage switchgear application and technical guide, DET-882
Public manufacturer number/name association. Drafting explanations are independently written.
IEEE C37.2-2022: power-system device function numbers
Normative device-number publication; exact edition wording and compliance require the 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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