# Breaker truck-operated contact interface Canonical URL: https://eloragrid.ai/symbols/breaker-truck-operated-contact-interface Publisher: Elora Grid Updated: 2026-11-03 Lookup label: BTCI Drawing use: Schematic Reference families: Manufacturer Representation: Functional block Installation focus: switchgear Input: Truck movement Output: TOC auxiliary contacts Reports the removable truck's connection state through its truck-operated contact assembly. ## In plain English ### What this block does Reports the removable truck's connection state through its truck-operated contact assembly. ### A simple example In a switchgear control schematic, the bay controller compares independent status contacts before displaying a position or allowing another operation. The signal labels explain which physical state each contact represents. For this reference, the drawing identifies “Truck movement” at the input and “TOC auxiliary contacts” at the output. Truck position does not establish main-contact state. ### What the drawings help you do Start at the named input: Truck movement. Identify its source device or document and the state represented on the drawing. Follow the named output: TOC auxiliary contacts. Cross-reference its destination and separate the command from confirmation that the equipment responded. ### Terms - Input: Truck movement - Output: TOC auxiliary contacts - Application reference: An explanation of a named drawing function or circuit relationship; the project documents define the equipment and its connections. Concept diagram: Truck movement → BTCI → TOC auxiliary contacts 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 Reports the removable truck's connection state through its truck-operated contact assembly. Breaker status indications describe the operating mechanism, the removable truck or the health of a supporting system. These signals are related but are not interchangeable: an open breaker can still have its truck connected to live bus contacts. In a switchgear control schematic, the bay controller compares independent status contacts before displaying a position or allowing another operation. The signal labels explain which physical state each contact represents. For this reference, the drawing identifies “Truck movement” at the input and “TOC auxiliary contacts” at the output. Truck position does not establish main-contact state. Keep contact reference conditions, terminal numbers and interpretation logic together. Distinguish a mechanically operated indication from a measured current or voltage condition. 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: Truck movement. Identify its source device or document and the state represented on the drawing. - Follow the named output: TOC auxiliary contacts. Cross-reference its destination and separate the command from confirmation that the equipment responded. - Truck position does not establish main-contact state. - Keep contact reference conditions, terminal numbers and interpretation logic together. Distinguish a mechanically operated indication from a measured current or voltage condition. ## Information to show or reference - Label the source and connection reference for truck movement. - Identify the destination and defined state of toc auxiliary contacts. - Record the equipment or control-document revision supporting this functional block. - Check this application limit in the project design: Truck position does not establish main-contact state. ## Important distinction Truck position does not establish main-contact state. 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: Truck movement - Output / connection: TOC auxiliary contacts - Lookup label: BTCI 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 position and status interfaces. 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.