Dual-channel trip segregation

What it represents

Keeps the two documented opening-command channels electrically identifiable through the terminal strip. A trip circuit carries an opening request from a control or protection device to the breaker operating mechanism. The opening command, the coil supply and the evidence that the breaker opened are separate parts of the drawing.

In a switchgear incomer panel, a protection relay requests opening and an auxiliary contact reports the resulting breaker position. A second trip path can have its own supply and wiring so that a single wiring fault does not remove both paths. For this reference, the drawing identifies “Two protection channels” at the input and “Separate trip paths” at the output. Shared wiring must be explicitly identified.

Trace the initiating contact, protective fuse, trip coil, return conductor and feedback independently. Identify which elements are shared between redundant paths. The diagram explains the intended command path; coil ratings and terminal numbers come from the selected breaker. The functional block is an independent explanation of this named application. Equipment-specific ratings, terminal connections and operating conditions must be established in the project documentation.

How to read it

• Start at the named input: Two protection channels. Identify its source device or document and the state represented on the drawing.
• Follow the named output: Separate trip paths. Cross-reference its destination and separate the command from confirmation that the equipment responded.
• Shared wiring must be explicitly identified.
• Trace the initiating contact, protective fuse, trip coil, return conductor and feedback independently. Identify which elements are shared between redundant paths. The diagram explains the intended command path; coil ratings and terminal numbers come from the selected breaker.

Information to show or reference

• Label the source and connection reference for two protection channels.
• Identify the destination and defined state of separate trip paths.
• Record the equipment or control-document revision supporting this functional block.
• Check this application limit in the project design: Shared wiring must be explicitly identified.

Sources you can follow

These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.

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. Original artwork is available under CC BY 4.0. Third-party references retain their own terms.