{"schemaVersion":1,"slug":"motor-underload-process-alarm","name":"Motor underload process alarm","kind":"symbol","abbreviation":"MUPA","aliases":["Motor-feeder control interfaces","switchgear Motor-feeder control interfaces","switchgear","Switchgear","Measured motor load","Underload alarm"],"category":"control-circuits","drawingTypes":["Schematic"],"referenceFamilies":["Manufacturer"],"summary":"Indicates a low-load condition used by the assigned process-monitoring function.","description":["Indicates a low-load condition used by the assigned process-monitoring function. A motor feeder combines switching, motor protection and an operating command. Starting permission, running feedback and protection trip are different signals even where one relay or controller processes all of them.","In a switchroom motor-control panel, a ventilation motor can receive an automatic start request while a local selector and the motor protection determine whether the feeder is available. For this reference, the drawing identifies “Measured motor load” at the input and “Underload alarm” at the output. Low load has application-specific meaning.","Link the motor tag to its contactor, protective device and process permissives. The control diagram must identify stop priority, feedback and restart philosophy without supplying unverified settings. 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."],"readingNotes":["Start at the named input: Measured motor load. Identify its source device or document and the state represented on the drawing.","Follow the named output: Underload alarm. Cross-reference its destination and separate the command from confirmation that the equipment responded.","Low load has application-specific meaning.","Link the motor tag to its contactor, protective device and process permissives. The control diagram must identify stop priority, feedback and restart philosophy without supplying unverified settings."],"drawingChecklist":["Label the source and connection reference for measured motor load.","Identify the destination and defined state of underload alarm.","Record the equipment or control-document revision supporting this functional block.","Check this application limit in the project design: Low load has application-specific meaning."],"distinction":"Low load has application-specific meaning. 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":[{"label":"Representation","value":"Functional block"},{"label":"Installation focus","value":"Switchgear"},{"label":"Input / boundary","value":"Measured motor load"},{"label":"Output / connection","value":"Underload alarm"},{"label":"Lookup label","value":"MUPA is a library lookup label, not a standard device designation."}],"references":[{"sourceId":"pi26-motor-relay","relevance":"Public technical context for motor-feeder control interfaces. Motor feeder thermal, starting and control functions. The application text and educational graphic are independently authored; the publisher does not certify this representation."}],"related":["contactor","motor-overload-trip-nc-contact","motor-phase-unbalance-alarm-interface"],"artwork":"pi26-motor-underload-process-alarm","publishedOn":"2026-11-03","updatedOn":"2026-11-03","provenance":"independent-public-research","representation":{"type":"functional-block","focus":"switchgear","family":"motor-feeders","input":"Measured motor load","output":"Underload alarm"},"plainEnglish":{"title":"What this block does","introduction":"Indicates a low-load condition used by the assigned process-monitoring function.","example":"In a switchroom motor-control panel, a ventilation motor can receive an automatic start request while a local selector and the motor protection determine whether the feeder is available. For this reference, the drawing identifies “Measured motor load” at the input and “Underload alarm” at the output. Low load has application-specific meaning.","drawings":"Start at the named input: Measured motor load. Identify its source device or document and the state represented on the drawing. Follow the named output: Underload alarm. Cross-reference its destination and separate the command from confirmation that the equipment responded.","terms":[{"name":"Input","meaning":"Measured motor load"},{"name":"Output","meaning":"Underload alarm"},{"name":"Application reference","meaning":"An explanation of a named drawing function or circuit relationship; the project documents define the equipment and its connections."}],"diagram":"flow","steps":["Measured motor load","MUPA","Underload alarm"],"caption":"A reading guide. The entry's original illustration and input/output facts describe this application.","sources":[{"label":"SEL-710 motor protection and control","url":"https://selinc.com/products/710/"}],"profileId":"power-installation-motor-feeders"},"url":"https://eloragrid.ai/symbols/motor-underload-process-alarm","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/motor-underload-process-alarm.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"pi26-motor-relay","publisher":"SEL","title":"SEL-710 motor protection and control","url":"https://selinc.com/products/710/","scope":"Motor feeder thermal, starting and control functions.","type":"manufacturer","checkedOn":"2026-11-03","reuse":"link-only","relevance":"Public technical context for motor-feeder control interfaces. Motor feeder thermal, starting and control functions. The application text and educational graphic are independently authored; the publisher does not certify this representation."}]}