# Breaker close-pulse shaping Canonical URL: https://eloragrid.ai/symbols/breaker-close-pulse-shaping Publisher: Elora Grid Updated: 2026-11-03 Lookup label: BCS Drawing use: Schematic Reference families: Manufacturer Representation: Functional block Installation focus: switchgear Input: Maintained control request Output: Bounded close pulse Converts a maintained supervisory request into the documented finite closing pulse. ## In plain English ### What this block does Converts a maintained supervisory request into the documented finite closing pulse. ### A simple example In a switchgear bus-coupler panel, a close request is checked against position, mechanism readiness and the selected live-bus or dead-bus conditions before the closing circuit is enabled. For this reference, the drawing identifies “Maintained control request” at the input and “Bounded close pulse” at the output. Pulse width is set by the equipment design. ### What the drawings help you do Start at the named input: Maintained control request. Identify its source device or document and the state represented on the drawing. Follow the named output: Bounded close pulse. Cross-reference its destination and separate the command from confirmation that the equipment responded. ### Terms - Input: Maintained control request - Output: Bounded close pulse - Application reference: An explanation of a named drawing function or circuit relationship; the project documents define the equipment and its connections. Concept diagram: Maintained control request → BCS → Bounded close pulse 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 Converts a maintained supervisory request into the documented finite closing pulse. A closing circuit combines an operator or automatic request with the conditions that allow the breaker to close. The closing coil releases stored mechanism energy where that construction is used; it is different from the spring-charging motor. In a switchgear bus-coupler panel, a close request is checked against position, mechanism readiness and the selected live-bus or dead-bus conditions before the closing circuit is enabled. For this reference, the drawing identifies “Maintained control request” at the input and “Bounded close pulse” at the output. Pulse width is set by the equipment design. Follow request, permission and final coil output as separate signals. A permissive diagram must say which conditions block closing and what happens if a feedback signal becomes unavailable. 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: Maintained control request. Identify its source device or document and the state represented on the drawing. - Follow the named output: Bounded close pulse. Cross-reference its destination and separate the command from confirmation that the equipment responded. - Pulse width is set by the equipment design. - Follow request, permission and final coil output as separate signals. A permissive diagram must say which conditions block closing and what happens if a feedback signal becomes unavailable. ## Information to show or reference - Label the source and connection reference for maintained control request. - Identify the destination and defined state of bounded close pulse. - Record the equipment or control-document revision supporting this functional block. - Check this application limit in the project design: Pulse width is set by the equipment design. ## Important distinction Pulse width is set by the equipment design. 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: Maintained control request - Output / connection: Bounded close pulse - Lookup label: BCS 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 closing controls. 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.