Metering & protection

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AC autoreclosing79 · SLD / Schematic Accelerating or decelerating device18 · SLD / Schematic Active-energy meterkWh · SLD / Schematic Active-power indicatorkW · SLD / Schematic Active-power transducerP/I · Schematic / SLD Admittance-based earth-fault protection21YN · SLD / Schematic Alarm relay74 · SLD / Schematic AmmeterA · SLD / Schematic Ampere-hour meterAh · SLD / Schematic Analog current signal isolatorISO I-I · SLD / Schematic Annunciator relay30 · SLD / Schematic ANSI/IEEE active power indicator symbolW · SLD / Schematic ANSI/IEEE ammeter symbolA · SLD / Schematic ANSI/IEEE ampere-hour meter symbolAh · Schematic / SLD ANSI/IEEE Combined line and phase voltmeter selector formHSW1S92 · Schematic ANSI/IEEE current transformer symbolCT · SLD / Schematic ANSI/IEEE current transformer with conductor indication symbolCT · SLD / Schematic ANSI/IEEE current transformer with two secondaries symbolCT 2SEC · SLD / Schematic ANSI/IEEE Current window monitoring relay formI WINDOW · SLD / Schematic ANSI/IEEE differential voltmeter symbolΔV · Schematic ANSI/IEEE Differential-current measuring relay formI DIFF · SLD / Schematic ANSI/IEEE Earth-fault current relay formK · Schematic / SLD ANSI/IEEE Earth-fault voltage relay formK · Schematic / SLD ANSI/IEEE Four-point current measurement selector formHSW1S95 · Schematic ANSI/IEEE frequency meter symbolHz · SLD / Schematic ANSI/IEEE Frequency monitoring relay formf MON · SLD / Schematic ANSI/IEEE impulse tachometric dynamo symbolTP · Schematic ANSI/IEEE Insulation monitoring relay formIMD · Schematic / SLD ANSI/IEEE Loss-of-voltage monitoring relay formU LOSS · SLD / Schematic ANSI/IEEE Maximum-current monitoring relay formI HIGH · SLD / Schematic ANSI/IEEE Maximum-voltage measuring relay formK · Schematic / SLD ANSI/IEEE Minimum active-power relay formP LOW · SLD / Schematic ANSI/IEEE Minimum-current monitoring relay formI LOW · SLD / Schematic ANSI/IEEE Minimum-impedance measuring relay formK · Schematic / SLD ANSI/IEEE Minimum-voltage measuring relay formK · Schematic / SLD ANSI/IEEE Neutral-current measuring relay formK · Schematic / SLD ANSI/IEEE Neutral-unbalance relay between two polyphase systems formK · Schematic / SLD ANSI/IEEE optical tachometric dynamo symbolTO · Schematic ANSI/IEEE Percentage-biased differential current relay formK · Schematic / SLD ANSI/IEEE phase-angle meter symbolPH · SLD / Schematic ANSI/IEEE Phase-loss monitoring relay formPH LOSS · SLD / Schematic ANSI/IEEE Phase-to-neutral voltmeter selector formHSW1S91 · Schematic ANSI/IEEE Phase-to-phase voltmeter selector formHSW1S90 · Schematic ANSI/IEEE power-factor meter symbolPF · SLD / Schematic ANSI/IEEE pressure/current converter symbolP/I · Schematic ANSI/IEEE reactive-power meter symbolvar · SLD / Schematic ANSI/IEEE recording wattmeter symbolW REC · SLD / Schematic ANSI/IEEE Residual-voltage monitoring relay formU RES · SLD / Schematic ANSI/IEEE Reverse-current measuring relay formK · Schematic / SLD ANSI/IEEE running-hours meter symbolHOURS · SLD / Schematic ANSI/IEEE single-phase AC-DC current converter symbolI~/I= · Schematic ANSI/IEEE synchronoscope symbolSYNC SCOPE · SLD / Schematic ANSI/IEEE tachometer symbolTACH · Schematic ANSI/IEEE tachometric dynamo symbolTG · Schematic ANSI/IEEE tapped-secondary current transformer symbolCT TAP · SLD / Schematic ANSI/IEEE thermocouple symbolTC · Schematic ANSI/IEEE thermocouple with terminal board symbolTC · Schematic ANSI/IEEE thermometer symbolT · Schematic ANSI/IEEE thermometer/pyrometer symbolPYR · Schematic ANSI/IEEE Three-point current measurement selector formHSW1S94 · Schematic ANSI/IEEE Three-wire ultrasonic sensor formHPX11U3 · Schematic ANSI/IEEE Two-network voltage measurement selector formHSW1S93 · Schematic ANSI/IEEE Ultrasonic NC switching output formHPX12U · Schematic ANSI/IEEE Ultrasonic NO switching output formHPX11U · Schematic ANSI/IEEE Ultrasonic proximity switch formHPX1U · Schematic ANSI/IEEE voltage transformer symbolVT / PT · SLD / Schematic ANSI/IEEE voltmeter symbolV · SLD / Schematic Apparatus thermal device26 · SLD / Schematic Apparent power-factor supervision55A · SLD / Schematic Apparent-energy meterkVAh · SLD / Schematic Arc-flash fibre loop sensorAF · SLD / Schematic Arc-flash point light sensorAF · SLD / Schematic Atmospheric condition monitor45 · SLD / Schematic Auto-reclose initiation selectionAIS · Schematic Auto-reclose lockout interfaceALI · Schematic Automatic selective control or transfer relay83 · SLD / Schematic Automatic voltage-regulator enableAVE · Schematic Auxiliary motor or motor-generator88 · SLD / Schematic Auxiliary-input overvoltage59A · SLD / Schematic Auxiliary-input undervoltage protection27A · SLD / Schematic Battery current shuntDC · GA / Schematic Bay command-termination feedbackBCF · Schematic Bay-controller supervisory data interfaceBSDI · Schematic Bearing protective device38 · SLD / Schematic Bidirectional active-energy meterkWh · SLD / Schematic Blocking or out-of-step supervision68 · SLD / Schematic Breaker-failure current-check gateBCG · Schematic Breaker-failure initiate interfaceBII · Schematic Breaker-failure retrip outputBRO · Schematic Breaker-failure upstream trip matrixBUTM · Schematic Broken-delta residual input interfaceBRII · Schematic Brush-operating or slip-ring short-circuiting device35 · SLD / Schematic Buchholz relayBR · Schematic / SLD Bus differential check-zone interfaceBDCI · Schematic Bus differential zone-selection blockBDZB · Schematic Bus protection isolator-replica interfaceBPII · Schematic Bus-voltage selection relay interfaceBSRI · Schematic Busbar differential protection87B · SLD / Schematic Bushing current transformerBCT · SLD / Schematic Calculated residual directional overcurrent67R · SLD / Schematic