{"schemaVersion":1,"slug":"motor-starts-per-hour-restraint","name":"Motor starts-per-hour restraint","kind":"symbol","abbreviation":"MSR","aliases":["Motor-feeder control interfaces","switchgear Motor-feeder control interfaces","switchgear","Switchgear","Start history and time","Start restraint state"],"category":"control-circuits","drawingTypes":["Schematic"],"referenceFamilies":["Manufacturer"],"summary":"Limits new starts according to the documented operating-duty rule.","description":["Limits new starts according to the documented operating-duty rule. 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 “Start history and time” at the input and “Start restraint state” at the output. Manufacturer limits determine acceptable starting duty.","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: Start history and time. Identify its source device or document and the state represented on the drawing.","Follow the named output: Start restraint state. Cross-reference its destination and separate the command from confirmation that the equipment responded.","Manufacturer limits determine acceptable starting duty.","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 start history and time.","Identify the destination and defined state of start restraint state.","Record the equipment or control-document revision supporting this functional block.","Check this application limit in the project design: Manufacturer limits determine acceptable starting duty."],"distinction":"Manufacturer limits determine acceptable starting duty. 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":"Start history and time"},{"label":"Output / connection","value":"Start restraint state"},{"label":"Lookup label","value":"MSR 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-stalled-start-trip-interface"],"artwork":"pi26-motor-starts-per-hour-restraint","publishedOn":"2026-11-03","updatedOn":"2026-11-03","provenance":"independent-public-research","representation":{"type":"functional-block","focus":"switchgear","family":"motor-feeders","input":"Start history and time","output":"Start restraint state"},"plainEnglish":{"title":"What this block does","introduction":"Limits new starts according to the documented operating-duty rule.","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 “Start history and time” at the input and “Start restraint state” at the output. Manufacturer limits determine acceptable starting duty.","drawings":"Start at the named input: Start history and time. Identify its source device or document and the state represented on the drawing. Follow the named output: Start restraint state. Cross-reference its destination and separate the command from confirmation that the equipment responded.","terms":[{"name":"Input","meaning":"Start history and time"},{"name":"Output","meaning":"Start restraint state"},{"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":["Start history and time","MSR","Start restraint state"],"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-starts-per-hour-restraint","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/motor-starts-per-hour-restraint.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."}]}