# Breaker disconnected-position proof Canonical URL: https://eloragrid.ai/symbols/breaker-disconnected-position-proof Publisher: Elora Grid Updated: 2026-11-03 Lookup label: BDP Drawing use: Schematic Reference families: Manufacturer Representation: Functional block Installation focus: switchgear Input: Disconnected-position contact Output: Disconnected truck status Identifies the documented disconnected truck position independently of an open main contact. ## In plain English ### What this block does Identifies the documented disconnected truck position independently of an open main contact. ### 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 “Disconnected-position contact” at the input and “Disconnected truck status” at the output. Physical isolation requirements remain equipment-specific. ### What the drawings help you do Start at the named input: Disconnected-position contact. Identify its source device or document and the state represented on the drawing. Follow the named output: Disconnected truck status. Cross-reference its destination and separate the command from confirmation that the equipment responded. ### Terms - Input: Disconnected-position contact - Output: Disconnected truck status - Application reference: An explanation of a named drawing function or circuit relationship; the project documents define the equipment and its connections. Concept diagram: Disconnected-position contact → BDP → Disconnected truck status 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 Identifies the documented disconnected truck position independently of an open main contact. 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 “Disconnected-position contact” at the input and “Disconnected truck status” at the output. Physical isolation requirements remain equipment-specific. 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: Disconnected-position contact. Identify its source device or document and the state represented on the drawing. - Follow the named output: Disconnected truck status. Cross-reference its destination and separate the command from confirmation that the equipment responded. - Physical isolation requirements remain equipment-specific. - 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 disconnected-position contact. - Identify the destination and defined state of disconnected truck status. - Record the equipment or control-document revision supporting this functional block. - Check this application limit in the project design: Physical isolation requirements remain equipment-specific. ## Important distinction Physical isolation requirements remain equipment-specific. 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: Disconnected-position contact - Output / connection: Disconnected truck status - Lookup label: BDP 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.