IEC symbol forms

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Magnetoresistive elementHVR1S00689 · Schematic Magnetostrictive-effect qualifierQ020803 · Schematic Main earthing terminalMET · SLD / Schematic Maintained emergency luminaire plan markEM-M · GA Maintained normally-closed contactNC HOLD · Schematic Maintained normally-closed pushbuttonPB NC HOLD · Schematic Maintained normally-open contactNO HOLD · Schematic Maintained normally-open pushbuttonPB NO HOLD · Schematic Maintained-position qualifierQ070108 · Schematic Make-before-break changeover contactMBB · Schematic Manual call point plan symbolMCP · GA Manual transfer switchMTS · SLD / Schematic Manual-operation qualifierQ021301 · Schematic Manually released latching deviceQ1020604 · Schematic Manually unlatched NC contactNC UNLATCH · Schematic Manually unlatched NO contactNO UNLATCH · Schematic Maximum-demand indicatorMD · SLD / Schematic Maximum-voltage measuring relayK · Schematic / SLD Measuring relayK MEAS · Schematic Mechanical clutch connectionQ021216 · Schematic Mechanical gear connectionQ021223 · Schematic Mechanical interlock between devicesQ021211 · Schematic Mechanical stop latch in engaged stateQ021210 · Schematic Mechanical stop latch in neutral stateQ021209 · Schematic Mechanical stop-latch indicationQ021208 · Schematic Mechanically latched relay coilK LATCH · Schematic Media converter symbolMC · Schematic Microgrid controllerMGC · SLD / Schematic Microgrid interconnection switchMIS · SLD Microphone inputHAN1B9 · Schematic Miniature circuit breakerMCB · SLD / Schematic Minimum-impedance measuring relayK · Schematic / SLD Minimum-voltage measuring relayK · Schematic / SLD Minute-pulse clock contactHIN1P33 · Schematic Motor full-range fusegM · SLD / Schematic Motor overload alarm NO contactOL NO · Schematic Motor overload trip NC contactOL NC · Schematic Motor short-circuit fuseaM · SLD / Schematic Motor-generator setMG · SLD / Schematic Motor-operation qualifierQ021326 · Schematic Moulded-case circuit breakerMCCB · SLD / Schematic Multi-core current transformerCT · SLD / Schematic Multi-pole plug and socketX · Schematic Multi-rate energy meterkWh · SLD / Schematic Multi-sensor fire detector plan symbolMSD · GA Multi-tube fluorescent luminaire plan markLF3 · GA Multicore cable sealing endSE · SLD / Schematic Multiple socket outletSOn · GA Network router symbolRTR · Schematic / GA Network switch symbolSW · Schematic / GA Neutral conductor markN · SLD / Schematic Neutral earthing resistorNER · SLD / Schematic Neutral link, closedN · SLD / Schematic Neutral link, openN · SLD / Schematic Neutral-current measuring relayK · Schematic / SLD Neutral-to-earth linkMEN · SLD / Schematic Neutral-unbalance relay between two polyphase systemsK · Schematic / SLD Noiseless earth- · Schematic Non-ionising radiation qualifierQ020901 · Schematic Non-maintained emergency luminaire plan markEM-NM · GA Non-resettable counter relayCOUNT TOTAL · Schematic Normally closed contactNC · Schematic Normally closed pushbuttonPB NC · Schematic Normally open contactNO · Schematic Normally open pushbuttonPB NO · Schematic Normally-closed limit switchLS NC · Schematic Normally-open limit switchLS NO · Schematic Numerical protection relay (IED)IED · SLD / Schematic Off-delay normally-closed contactTOFF NC · Schematic Off-delay normally-open contactTOFF NO · Schematic Off-delay timer relayTOFF · Schematic Offline standby UPSUPS VFD · SLD / Schematic OhmmeterΩ · Schematic On-delay normally-closed contactTON NC · Schematic On-delay normally-open contactTON NO · Schematic On-delay timer relayTON · Schematic One-line bus tapHDV1_BT_1- · SLD / Schematic One-line cable identificationHW01_1- · Schematic One-line connector representationHC01PJ_1- · Schematic One-line power receptacleHC01WR_1- · Schematic One-line terminal representationHT0001_1- · Schematic One-way light switch plan markS1 · GA One-way linear-motion qualifierQ020401R · Schematic One-way rotary-motion qualifierQ020403 · Schematic Online double-conversion UPSUPS VFI · SLD Open-delta voltage transformer connectionVT · SLD / Schematic Open-delta winding connectionOPEN D · SLD / Schematic Optical beam smoke detector plan symbolBD · GA Optical current sensorOCT · SLD Optical fibre cableOF · Schematic / SLD Optical tachometric transducerHIN1B13 · Schematic OscilloscopeOSC · Schematic Outbound-energy-flow qualifierQ020506 · SLD / Schematic Overhead lineOHL · SLD / GA Partial-V winding connectionQ060202 · SLD / Schematic PEN conductor markPEN · SLD / Schematic Percentage-biased differential current relayK · Schematic / SLD Permanent-magnet DC motorM DC PM · SLD / Schematic Permanent-magnet linear DC motorHMO1M14 · SLD / Schematic Permanent-magnet stepping motorHMO1M15 · SLD / Schematic