# Trip-output interposing relay Canonical URL: https://eloragrid.ai/symbols/trip-output-interposing-relay Publisher: Elora Grid Updated: 2026-11-03 Lookup label: TIR Drawing use: Schematic Reference families: Manufacturer Representation: Functional block Installation focus: switchgear Input: Relay trip output Output: Interposing contact Transfers a protective-relay output to an opening circuit with a different electrical duty. ## In plain English ### What this block does Transfers a protective-relay output to an opening circuit with a different electrical duty. ### A simple example 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 “Relay trip output” at the input and “Interposing contact” at the output. Contact duty is distinct from relay logic. ### What the drawings help you do Start at the named input: Relay trip output. Identify its source device or document and the state represented on the drawing. Follow the named output: Interposing contact. Cross-reference its destination and separate the command from confirmation that the equipment responded. ### Terms - Input: Relay trip output - Output: Interposing contact - Application reference: An explanation of a named drawing function or circuit relationship; the project documents define the equipment and its connections. Concept diagram: Relay trip output → TIR → Interposing contact A reading guide. The entry's original illustration and input/output facts describe this application. - [Masterclad medium-voltage switchgear: circuit-breaker section interlocks](https://productinfo.se.com/masterclad_mv_switchgear_ib/6055-30-masterclad-15kv-mv-switchgear-ib/English/6055-30%20Masterclad%20MV%20Switchgear%20Indoor%20%28bookmap%29_DD00646805.xml/%24/Section6-CircuitBreakerSectionInter-58DD6EC7) ## What it represents Transfers a protective-relay output to an opening circuit with a different electrical duty. 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 “Relay trip output” at the input and “Interposing contact” at the output. Contact duty is distinct from relay logic. 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: Relay trip output. Identify its source device or document and the state represented on the drawing. - Follow the named output: Interposing contact. Cross-reference its destination and separate the command from confirmation that the equipment responded. - Contact duty is distinct from relay logic. - 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 relay trip output. - Identify the destination and defined state of interposing contact. - Record the equipment or control-document revision supporting this functional block. - Check this application limit in the project design: Contact duty is distinct from relay logic. ## Important distinction Contact duty is distinct from relay logic. This reference describes the named application; it does not establish a new IEC graphical symbol, an ANSI device-function number or an exact manufacturer connection diagram. ## Facts - Representation: Functional block - Installation focus: Switchgear - Input / boundary: Relay trip output - Output / connection: Interposing contact - Lookup label: TIR is a library lookup label, not a standard device designation. ## Public references - [Masterclad medium-voltage switchgear: circuit-breaker section interlocks](https://productinfo.se.com/masterclad_mv_switchgear_ib/6055-30-masterclad-15kv-mv-switchgear-ib/English/6055-30%20Masterclad%20MV%20Switchgear%20Indoor%20%28bookmap%29_DD00646805.xml/%24/Section6-CircuitBreakerSectionInter-58DD6EC7) — Schneider Electric. Public technical context for breaker trip circuits. Breaker control, mechanism, position contacts, racking interlocks and test interfaces. The application text and educational graphic are independently authored; the publisher does not certify this representation. ## Graphic scope Independent original educational concept illustration by Elora Grid. Not a certified standards graphic or manufacturer footprint. Unitless; not to scale. Original artwork licence: https://creativecommons.org/licenses/by/4.0/. Publisher material is linked only.