IEC 60617 SYMBOLS IEC SYMBOL IEC DESCRIPTION Connection, General Symbol Alternative: Conductor; Cable; Line; Transmission Path; Telecommunication Line. Group of Connections (Number of Connections Indicated)(form 1) Group of Connections (Number of Connections Indicated) (form 2) COMMENTS Levels are in place indicating the type of conductor: Power_Cable, 3 Phases / 3 Connections 3 Phases / 3 Connections 3-Phase Circuit Additional Information may be indicated Flexible Connection Used as trailing cable symbology Screened Conductor Twisted Connection Conductors in a Cable Coaxial Pair Coaxial Pair Connected to Terminals Coaxial Pair with screen Two connections shown Five conductors, two of which marked by arrowheads are in one cable. IEC 60617 SYMBOLS IEC SYMBOL IEC DESCRIPTION COMMENTS Terminal Terminal Strip T-Connection (form 1) T-Connection (form 2) Double junction of conductors (form 1) Double junction of conductors (form 2) Brancing Neutral Point Neutral point of a generator (single-line representation) Neutral point of a generator (multi-line representation) Shown with junction symbol. IEC 60617 SYMBOLS IEC SYMBOL IEC DESCRIPTION Contact, female(of a socket or plug) Socket Contact, male (of a socket or plug) Plug Plug and socket Plug and socket, multipole (multi-line representation) Plug and socket, multipole (multi-line representation) Connecting link, closed Test terminal, twin stud type (form 1) Connecting link, closed (form2) Connecting link, open Plug and socket-type connector, male-male U-link Plug and socket-type connector, male-female U-link Plug and socket-type connector, male-male with socket access COMMENTS IEC 60617 SYMBOLS IEC SYMBOL IEC DESCRIPTION Cable sealing end (multi-core cable) Cable sealing end (one-core cable) Straight-through joint box (multi-line representation) Straight-through joint box (single-line representation) Junction box (multi-line representation) Junction box (single-line representation) Pressure-tight bulkhead cable gland COMMENTS IEC 60617 SYMBOLS IEC SYMBOL IEC DESCRIPTION COMMENTS Triode thyristor, type unspecified Object Equipment: Device, Funtional unit, Component, Function (form 1) Object Equipment: Device, Funtional unit, Component, Function (form 2) Object Equipment: Device, Funtional unit, Component, Function (form 3) Envelope (form 2) Boundary Shield Protection against unintentional direct contact, general symbol Replacing S00067 Alternating Current (form 1) Alternating current (indication of frequency) Alternating Current (Indicationn of frequency range: low) Different frequency ranges. Relatively low frequencies (power frequencies or sub-audio frequencies) Alternating Current (indication of frequency range: medium) Different frequency ranges. Medium frequencies (audio) Alternating Current (indication of frequency range: high) Different frequency ranges.Relatively high frequencies (super audio, carrier) Rectifier current with alternating component Shown for alternating current of 50 Hz. IEC 60617 SYMBOLS IEC SYMBOL IEC DESCRIPTION COMMENTS Positive polarity Negative polarity Neutral Mid-wire Adjustibility, general symbol Adjustibility, non-linear Variability,general symbol Variability,non-linear Adjustability, pre-set Pre-set adjustibility Action in steps 5 steps shown. Adjustibility step by step Continious variability Continious variability pre-set Pre-set adjustment, continuously variable Automatic control IEC 60617 SYMBOLS IEC SYMBOL IEC DESCRIPTION Amplifier with automatic gain control Rectilinear motion (unidirectional) Force; Unidirectional, in the direction of the arrowhead Rectilinear motion (bidirectional) Force Oscillating motion Thermal effect Electromagnetic effect Magnetostrictive effect Radiation, electromagnetic, non-ionizing Light Step function, positive going Step function, negative going Saw-tooth wave Facsimile Link Mechanical link, pneumatic link, hydraulic link, optical link, functional link, radio link Mechanical link (force or motion) Link, mechanical ; Mechanical link with indication of direction of force or motion Mechanical link (rotation) Link, mechanical; Mechanical link with indication of direction of rotation. COMMENTS IEC 60617 SYMBOLS IEC SYMBOL IEC DESCRIPTION Delayed action Action, delayed (form 1) Delayed action Action, delayed (form 2) Automatic return Detent Non-automatic return; Return, non-automatic; Device for maintaining a given position Detent, disengaged Detent, engaged Mechanical interlock Interlock, mechanical; Mechanical interlock between two devices Brake Brake, applied Electric motor with brake applied. Brake, released Electric motor with brake released Gearing Actuator, manual, general symbol Actuator, manual (Protected) Manual actuator protected against unintentional operation Actuator (operated by pulling) Actuator (operated by pulling) Actuator (opetated by pushing) COMMENTS IEC 60617 SYMBOLS IEC SYMBOL IEC DESCRIPTION Actuator (operated by proximity effect) Actuator (operated by touching) Actuator, emergency Emergency actuator, type "mushroom-head" Actuator (operated by handwheel) Actuator (operated by pedal) Actuator (operated by lever) Actuator (operated by removable handle) Actuator (operated by key) Actuator (operated by crank) Actuator (operated by roller) Actuator (operated by cam) Actuator (operated by cam/cam profile) Actruator (operated by cam/profile plate) Actuator (operated by cam and roller) COMMENTS IEC 60617 SYMBOLS IEC SYMBOL IEC DESCRIPTION Actuator (operated by stored mechanical energy) Actuator (actuated by pneumatic or hydraulic power/single action) Single acting actuator Actuator (actuated by pneumatic or hydraulic power/double action) Double acting actuator Actuator (actuated by electromagnetic effect) Actuator (operated by electric motor) Actuator (operated by electric clock) Actuator (semiconductor) Semiconductor actuator Actuator (actuated by liquid level) Actuator (actuated by a counter) Actuator (actuated by fluid flow) Actuator (actuaded by gas flow) Actuator (actuated by relative humidity) COMMENTS IEC 60617 SYMBOLS IEC SYMBOL IEC DESCRIPTION Earth, general symbol Earthing, general symbol; Ground (US), general symbol; Grounding (US), general symbol Functional equipotential bonding Functional bonding conductor; Functional bonding terminal Functional equipotential bonding Functional bonding conductor; Functional bonding terminal Simplified form Protective equipotential bonding Protective bonding conductor; Protective bonding terminal Fault Indication of assumed fault location Flashover Break-through Permanent Magnet Magnet, permanent Movable contact Sliding contact Test point indicator Converter, general symbol Power converter; Signal converter; Measuring transducer; Repeater Contactor function Circuit breaker function Disconnector (isolator) function Switch-disconnector function Isolating-switch function COMMENTS IEC 60617 SYMBOLS IEC SYMBOL IEC DESCRIPTION Make contact, general symbol, switch, general symbol Break contact Change-over break before make contact Change-over contact with off-position Change-over make before break contact, both ways (form 1) Change-over make before break contact, both ways (form 1) Make contact delayed closing Make contact delayed opening Make contact, delayed opening Break contact, delayed closing Make contact, delayed COMMENTS IEC 60617 SYMBOLS IEC SYMBOL IEC DESCRIPTION Contact assembly Switch, manually operated, general symbol Switch, manually operated, push-button, automatic return Switch, manually operated, pulling, automatic return Switch, maually operated, turning, stay-put Switch, maually operated with positive operation, push-button, automatic return Alarm switch Switch, emergency stop Position switch, make contact Position switch, break contact Position switch assembly COMMENTS IEC 60617 SYMBOLS IEC SYMBOL IEC DESCRIPTION Position switch, break contact, positive operation Limit switch Temperature sensitive switch, make contact Temperature sensitive switch, break contact Thermal switch, self-operating, break contat Bimetal break contact Gas discharge tube with thermal element Starter for fluorescent lamp Contactor; Main make contact of a contactor Contactor with automatic tripping Contactor, main break contact of a contactor Circuit Breaker Disconnector, Isolator Two-way disconnector, Two-way isolator COMMENTS IEC 60617 SYMBOLS IEC SYMBOL IEC DESCRIPTION Switch-dosconnector, On-load isolating switch Switch-disconnector, automatic release, On-load isolating switch, automatic release Disconnector, Isolator Trip-free mechanism Trip-free mechanism, application Mechanical switching device, three-pole Switch with positive opening COMMENTS IEC 60617 SYMBOLS IEC SYMBOL IEC DESCRIPTION Motor starter, general symbol Starter operating in steps Starter-regulator Direct-on-line starter, reversing Star-delta starter Starter with auto-transformer Starter-regulator with thyristor Operating device, general symbol; Relay coil, general symbol Operating coil of a selector (form 1) Relay coil of a slow-releasing relay Relay coil of a slow-operating relay Relay coil of a remanent relay (form 1) Relay coil of a remanent relay (form 2) COMMENTS IEC 60617 SYMBOLS IEC SYMBOL IEC DESCRIPTION COMMENTS Operating device of a thermal relay Measuring relay, Device related to a measuring relay Voltage failure to frame; Frame potential in case of fault Earth fault current Fuse, general symbol Fuse ; strike fuse Fuse with alarm contact Fuse with separate alarm Three-pole switch with striker fuses Fuse-switch Fuse-disconnector; Fuse isolator Fuse switch-disconnector; On-load isolating fuse switch With mechanical linkage. IEC 60617 SYMBOLS IEC SYMBOL IEC DESCRIPTION Spark gap Spark gap, double Surge diverter; Lightning arrester Protective gas discharge tube Protective gas discharge tube, symmetic Generating station, planned Generating station, in service or unspecified Combined electric and heat generated station, planned Combined electric and heat generating station, in service or unspecified Substation, planned COMMENTS IEC 60617 SYMBOLS IEC SYMBOL IEC DESCRIPTION Substation, in service or unspecified Hydroelectric generating station, planned Hydroelectric generating station, in service or unspecified Thermoelectric generating station, planned coal thermoelectric generating station; lignite thermoelectric generating station; oil thermoelectric generating station; gas thermoelectric generating station Thermoelectric generating station, in service or unspecified thermoelectric generating station coal; thermoelectric generating station lignite; thermoelectric generating station oil; thermoelectric generating station gas Nuclear energy generating station, planned Nuclear energy generating station, in service or unspecified Geothermic generating station, planned Geothermic generating station, in service or unspecified Solar generating station, planned Solar generating station, in service or unspecified Wind generator station, planned Wind generator station, in service or unspecified COMMENTS IEC 60617 SYMBOLS IEC SYMBOL IEC DESCRIPTION COMMENTS Underground Line Submarine Line Overhead Line Line with a duct; Line within a pipe Line within a six-way-duct Manhole for underground chamber Additional info. may be shown above the line representing the duct route. Additional info. may be shown above the line representing the duct route. Additional info. may be shown above the line representing the duct route. Head end with local antenna Directional Coupler, General Symbol Neutral conductor The symbol could be replaced by letter symbols in IEC 60445 Protective conductor The symbol could be replaced by letter symbols in IEC 60445 Combined protective & neutral conductor The symbol could be replaced by letter symbols in IEC 60445 3-phase wiring with neutral conductor & protective conductor The symbol could be replaced by letter symbols in IEC 60445 IEC 60617 SYMBOLS IEC SYMBOL IEC DESCRIPTION Wiring going upwards Wiring going downwards COMMENTS If the arrow is pointing to the top border (edge) of the drawing sheet, the wiring goes upward. If the arrow is pointing towards the bottom border (edge) of the drawing sheet, the wiring goes downward Wiring passing through vertically Box, General symbol Connection box; Junction box Consumers terminal, Service entrance equipment Distribution centre Socket outlet (power) general symbol Form 1 Multiple socket outlet (power) Form 2 Multiple socket outlet (power) Socket outlet (power) with protective contact Socket outlet (power) with sliding shutter IEC 60617 SYMBOLS IEC SYMBOL IEC DESCRIPTION COMMENTS Socket outlet (power) with single-pole switch Socket outlet (power) with interlocked switch Socket outlet (power) with isolating transformer Socket outlet (telecommunications), general symbol Designations in accordance with relevant IEC or ISO standards to show different type connections & outlet symbols: Switch, general symbol Switch with pilot light Period limiting switch, single-pole 2 pole switch Multiposition single pole switch 2 way single pole switch Intermediate switch Dimmer Pull-cord single pole switch Equivalent circuit diagram IEC 60617 SYMBOLS IEC SYMBOL IEC DESCRIPTION COMMENTS Push-button Push-button with indicator lamp Push-button protected against unintentional operation Time switch Key-operated switch Watchman's system device Lighting outlet position Lighting outlet on wall Luminaire, general symbol; Flourescent lamp, general symbol Luminaire with many flourescent tubes. Luminaire with many flourescent tubes. Projector, general symbol Spot light Flood light Emergency lighting luminaire on special circuit Self-contained emergency lighting luminaire Protection can be by means of a breakglass cover IEC 60617 SYMBOLS IEC SYMBOL IEC DESCRIPTION Water heater Time clock, time recorder COMMENTS IEC 60617 SYMBOLS IEC SYMBOL IEC DESCRIPTION Resistor, general symbol Resistor, adjustable Resistor, voltage dependant Varistor Resistor with movable contact Resistor with movable contact and off position Potentiameter with movable contact Potentiometer with movable contact and pre-set adjustment Resistor with fixed tappings Resistor with separate current and voltage Carbon-pile resistor Heating element Capacitor, general symbol Capacitor, polirized Electrolytic capacitor COMMENTS IEC 60617 SYMBOLS IEC SYMBOL IEC DESCRIPTION Capacitor, adjustable Capacitor with pre-set adjustment Capacitor, differential Capacitor, split and adjustable Capasitor, temperature dependent and polirised Capacitor, voltage dependent and polirised Semiconductor capacitor Coil, general symbol; Winding, general symbol Inductor; Choke Inductor with magnetic core Inductor with gap in magnetic core Inductor, continuously variable Inductor with fixed tappings Inductor with maveable contact, variable in steps Variometer COMMENTS IEC 60617 SYMBOLS IEC SYMBOL IEC DESCRIPTION Semiconductor diode, general symbol Light emitting diode (LED), general symbol Temperature sensing diode Variable capacitance diode Varactor Tunnel diode Esaki diode Breakdown diode, unidirectional Zener diode; Voltage regulator diode Breakdown diode, bidirectional Backward diode (unitunnel diode) Bidirectional diode Reverse blocking diode thyristor Reverse conducting diode thyristor Bidirectional diode thyristor; Diac COMMENTS IEC 60617 SYMBOLS IEC SYMBOL IEC DESCRIPTION Reverse blocking triode thyristor, N-gate (anode-side controlled) Reverse blocking triode thyristor, P-gate (cathode-side controlled) Turn-off thyristor, gate not specified Turn-off triode thyristor, N-gate (anode-side) Turn-off triode thyristor, P-gate (cathode-side controlled) Reverse blocking thyristor, tetrode type Bidirectional triode thyristor; Triac Reverse conducting triode thyristor, gate not specified Reverse conducting triode thyristor, N-gate (anode-side controlled) Reverse conducting triode thyristor, P-gate (cathode-side controlled) PNP transistor NPN transistor with collector connected to the envelope NPN avalanche transistor COMMENTS IEC 60617 SYMBOLS IEC SYMBOL IEC DESCRIPTION COMMENTS Unijunction transistor with P-type base Unijunction transistor with N-type base NPN transistor with transverse biased base PNIP transistor with connection to the intrinsic region PNIN transistor with connection to the intrinsic region Junction field effect transistor with N-type channel The gate and source connections shall be drawn in line. Junction field effect transistor with P-type channel The gate and source connections shall be drawn in line. Insulated gate field effect transistor IGFET enhancement type, single gate, P-type channel without substrate connection Insulated gate field effect transistor IGFET enhancement type, single gate, N-type channel without substrate connection Insulated gate field effect transistor IGFET enhancement type, single gate, P-type channel with substrate connection brought out Insulated gate field effect transistor IGFET enhancement type, single gate, N-type channel with substrate internally connected to source Insulated gate field effect transistor IGFET, depletion type, single gate, N-type channel without substrate connection Insulated gate field effect transistor IGFET, depletion type, single gate, P-type channel without substrate connection IEC 60617 SYMBOLS IEC SYMBOL IEC DESCRIPTION Insulated gate field effect transistor IGFET, depletion type, two gates, P-type channel with substrate connection brought out Insulated-gate bipolar transistor (IGBT) enhancement type, P channel Insulated-gate bipolar transistor (IGBT) enhancement type, N channel Insulated-gate bipolar transistor (IGBT) depletion type, P channel Insulated-gate bipolar transistor (IGBT) depletion type, N channel Light dependent resistor (LDR); Photo resistor Photodiode Photovoltaic cell Phototransistor Hall generator with four connections Magnetoresistor COMMENTS In the case of multiple gates, the primary gate and the source connection shall be drawn in line. IEC SYMBOL IEC DESCRIPTION Three-phase winding, delta Three-phase winding, open delta Three-phase winding, star Three-phase winding, star, with neutral brought out Brush (on slip-ring or commutator) Machine, general symbol Rotary converter; Generator; Synchronous generator; Motor; Synchronous motor Linear motor, general symbol Stepping motor, general symbol Series motor, DC Shunt motor, DC Generator, DC, compound excited (short shunt) COMMENTS IEC SYMBOL IEC DESCRIPTION Rotary converter, DC/DC with common permanent magnet field Rotary converter, DC/DC with common exitation winding Series motor, single-phase Repulsion motor, single-phase Series motor, three-phase Synchronous generator, three-phase with permanent magnet Synchronous motor, single-phase Synchronous generator, three-phase, star connected, neutral brought out COMMENTS IEC SYMBOL IEC DESCRIPTION Synchronous generator, three-phase, both ends of each phase winding brought out Synchronous rotary converter, three-phase, shunt-excited Induction motor, three-phase, squirrel cage Induction motor, single-phase, squirrel-cage Induction motor, three-phase, with wound rotor Induction motor, three-phase, star-connected Linear induction motor, three-phase COMMENTS IEC SYMBOL IEC DESCRIPTION Transformer with two windings, general symbol (form 1) Transformer with two windings, general symbol (form 2) Transformer with two windings (and instantaneous voltage polarity indicators) (form 2) Transformer with three windings, general symbol (form 1) Transformer with three windings, general symbol (form 2) Auto-transformer, general symbol (form 1) Auto-transformer, general symbol (form 2) Reactor, general symbol Choke (form 1) COMMENTS IEC SYMBOL IEC DESCRIPTION Reactor, general symbol Choke (form 2) Current transformer, general symbol (form 1) Current transformer, general symbol (form 2) Transformer with two windings and screen (form 1) Transformer with two windings and screen (form 2) Transformer with centre tap on one winding (form 1) Transformer with centre tap on one winding (form 2) Transformer with variable coupling (form 1) COMMENTS IEC SYMBOL IEC DESCRIPTION Transformer with variable coupling (form 2) Three-phase transformer, connection star-delta (form 1) Three-phase transformer, connection star-delta (form 2) Three-phase transformer with four taps, connection: star-star (form 1) Three-phase transformer with four taps, connection: star-star (form 2) Three-phase bank of single-phase transformers, connection star-delta (form 1) COMMENTS IEC SYMBOL IEC DESCRIPTION Three-phase bank of single-phase transformers, connection star-delta (form 2) Three-phase transformer with tap changer (form 1) Three-phase transformer with tap changer (form 2) Three-phase transformer, connection star-zigzag with the neutral brought out (form 1) Three-phase transformer, connection star-zigzag with the neutral brought out (form 2) Three-phase transformer, connection star-star-delta (form 1) COMMENTS IEC SYMBOL IEC DESCRIPTION Three-phase transformer, connection star-star-delta (form 2) Auto-transformer, single-phase (form 1) Auto-transformer, single-phase (form 2) Auto-transformer, three-phase, connection star (form 1) Auto-transformer, three-phase, connection star (form 2) Auto-transformer, single-phase with voltage regulation (form 1) Auto-transformer, single-phase with voltage regulation (form 2) Three-phase induction regulator (form 1) COMMENTS IEC SYMBOL IEC DESCRIPTION Three-phase induction regulator (form 2) COMMENTS IEC SYMBOL IEC DESCRIPTION Voltage transformer Measuring transformer (form 1) Voltage transformer Measuring transformer (form 2) Current transformer with two cores with one secondary winding on each core (form 1) Current transformer with two cores with one secondary winding on each core (form 2) Current transformer with two secondary windings on one core (form 1) Current transformer with two secondary windings on one core (form 2) Current transformer with one secondary winding with one tap (form 1) COMMENTS IEC SYMBOL IEC DESCRIPTION Current transformer with one secondary winding with one tap (form 2) Current transformer with five passages of a conductor acting as a primary winding (form 1) Current transformer with five passages of a conductor acting as a primary winding (form 2) Pulse or current transformer with three threaded primary conductors (form 1) Pulse or current transformer with three threaded primary conductors (form 2) Pulse or current transformer with two secondary windings on the same core (form 1) Pulse or current transformer with two secondary windings on the same core (form 2) COMMENTS IEC 60617 SYMBOLS IEC SYMBOL IEC DESCRIPTION DC/DC converter Chopper Rectifier Rectifier in full wave (bridge) connection Inverter Rectifier/inverter Primary cell Static generator, general symbol Heat source, general symbol Radio-isotope heat source Combustion heat source COMMENTS IEC 60617 SYMBOLS IEC SYMBOL IEC DESCRIPTION Thermoelectric generator, with combustion heat source Thermoelectric generator with non ionizing radiation heat source Thermoelectric generator with radio-isotope heat source Thermionic diode generator with non-ionizing heat source Thermionic diode generator with radio-isotope heat source Photovoltaic generator Closed-loop controller Indicating instrument, genral symbol COMMENTS IEC 60617 SYMBOLS IEC SYMBOL IEC DESCRIPTION Recording instrument, genral symbol Intergrading instrument, general symbol Energy meter Voltmeter Recording wattmeter Watt-hour meter Watt-hour, measuring energy transmitted in one direction only Watt-hour meter, counting the energy flow from the busbar COMMENTS IEC 60617 SYMBOLS IEC SYMBOL IEC DESCRIPTION Watt-hour meter, counting the energy flow towards the busbars Watt-hour meter, counting in both energy flow directions Multi-rate watt-hour meter Excess watt-hour meter Watt-hour meter with transmitter Slave watt-hour mater (repeater) Slave watt-hour meter (repeater) with printing device COMMENTS IEC 60617 SYMBOLS IEC SYMBOL IEC DESCRIPTION Thrmocouple Thermocouple with non-insulated heating element Thermocouple with insulated heating element Clock, general symbol secondary clock Clock with contact Lamp, general symbol lamp, general symbol; signal lamp, general symbol Signal lamp, flashing type Indicator, electromechanical; annunciator element Electromechanical position indicator Siren Buzzer Signalling lamp energized by a built-in transformer COMMENTS IEC 60617 SYMBOLS IEC SYMBOL IEC DESCRIPTION Selector wiper, non-bridging Selector wiper, bridging COMMENTS The small circle representing the hinge point may be open or filled in. The small circle representing the hinge point may be open or filled in. Arc or bank of single-motion selector Arc or bank of two-motion selector Selector arc with one special position Selector bank or level Selector level showing individual outlets or contacts Selector level with bridging wiper Selector level with non-bridging wiper Single-motion selector, non-homing Single-motion selector, homing An example of a special position is the home position. The groups of outlets or contacts may be shown in a line instead of in an arc The individual outlets or contacts may be shown in a line instead of in an arc IEC 60617 SYMBOLS IEC SYMBOL IEC DESCRIPTION COMMENTS Two-motion selector, homing Selector, motor driven, homing Selector for four-wire switching, homing Single-motion selector, set Single-motion homing selector with individual outlets Two-motion selector showing levels Crossbar selector, general symbol Crossbar selector, single connecting unit Crossbar selector, four-wire switching The selector is set via marked bank contact(s), non homing The individual outlets could also be groups of outlets. IEC 60617 SYMBOLS IEC SYMBOL IEC DESCRIPTION Antenna, general symbol COMMENTS IEC 60617 SYMBOLS IEC SYMBOL IEC DESCRIPTION Battery of primary or secondary cells Pulse transformer (form 1) Pulse transformer COMMENTS IEC 60617 SYMBOLS IEC SYMBOL IEC DESCRIPTION Direct current Direct current Alternating current Alternating current (form 2) Piezo-electric effect Spring-operated device COMMENTS IEC 60617 SYMBOLS IEC SYMBOL IEC DESCRIPTION Functional earthing; Functional grounding (US) Functional earthing conductor; Functional earthing terminal COMMENTS For the definition of functional earthing, see IEV 195-01-13. Functional equipotential bonding Functional bonding conductor; Functional bonding terminal For the definition of functional equipotential bonding, see IEV 195-01-16". Functional equipotential bonding Functional bonding conductor; Functional bonding terminal For the definition of functional equipotential bonding, see IEV 195-01-16". Capacitor, lead-through Capacitor, feed-through Multiple-function switching device Control and protective switching device (CPS); Reversing CPS Directed connection Point of access to a bundle Polarized relay, stable positions Shown with 2 stable positions Acoustic signalling device, general symbol Horn; Bell; Single-stroke bell; Whistle Combined electric and heat generated station, planned Combined electric and heat generating station, in service or unspecified Fan Pump The symbol is shown with wiring. The symbol applies symbol 2302 of ISO 14617. The symbol is shown with wiring. The symbol applies symbol 2301 of ISO 14617. IEC 60617 SYMBOLS IEC SYMBOL IEC DESCRIPTION COMMENTS Phase-shifting transformer, three-phase (form 1) Phase-shifting transformer, three-phase (form 2) Bushing type voltage transformer (form 1) Bushing type voltage transformer (form 2) Bushing type current transformer (form 1) Bushing type current transformer (form 2) Simplicity voltage detector Combined disconnector and earthing switch Individual actuator equipment may be added.