Home Symbol library Diagram symbols Electrical diagrams Electrical diagrams
Line symbols for wiring diagrams, single-line diagrams, ladder logic and lighting and socket layouts: contacts, coils, protection, motors, meters and components. Not certified against any standard.
Schematic symbols are drawn from scratch following the usual conventions of ISA-5.1, ISO 10628 and IEC 60617. They are not certified against those standards: check them against your company standard before using them in issued documentation. Each symbol’s note says what could not be verified.
All 261 Breakers, fuses & switchgear 22 Transformers, motors & generators 20 Sources, converters & compensation 15 Protection relays & meters 21 Contacts, coils & control devices 29 Electronic components 14 Conductors, earthing & connections 27 Ladder diagram symbols 46 Lighting on floor plans 19 Switches & sockets on floor plans 23 Lamps, pushbuttons & sounders on plans 25
261 of 261 symbols
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Breakers, fuses & switchgear 22
Thermal-magnetic circuit breaker Schematic Disconnector (isolator) Schematic Fuse Schematic Fuse-disconnector Schematic Residual current device (RCD) Schematic Thermal overload relay Schematic Surge arrester Schematic Draw-out circuit breaker Schematic Power circuit breaker (square) Schematic Bus coupler (tie breaker) Schematic Busbar with feeders Schematic Busbar (horizontal) Schematic +1 MV switchgear cell Schematic MV contactor Schematic Disconnector (horizontal) Schematic Earthing switch Schematic Enclosure / equipment boundary Schematic MV fuse (with striker) Schematic Spark gap Schematic Switch-disconnector Schematic Transformers, motors & generators 20
Autotransformer Schematic Generator Schematic Single-phase motor Schematic Three-phase motor Schematic DC motor Schematic Two-winding transformer Schematic Current transformer (CT) Schematic Two-core current transformer Schematic Synchronous generator Schematic Squirrel-cage induction motor Schematic Slip-ring induction motor Schematic Synchronous motor Schematic Neutral grounding reactor Schematic Neutral grounding resistor Schematic Reactor (choke coil) Schematic Three-winding transformer Schematic Two-winding transformer Dyn11 Schematic Wye-wye transformer YNyn0 Schematic Zig-zag earthing transformer Schematic Voltage transformer (VT) Schematic Sources, converters & compensation 15
Battery / DC source Schematic Variable frequency drive (VFD) Schematic Battery bank Schematic Capacitor bank (star) Schematic Variable capacitor (bank step) Schematic DC/DC converter Schematic DC/AC inverter Schematic AC/DC converter (rectifier) Schematic Harmonic filter (L-C to earth) Schematic Photovoltaic panel Schematic Generic AC source Schematic Generic DC source Schematic Grid supply (incomer) Schematic UPS (uninterruptible power supply) Schematic Wind turbine generator Schematic Protection relays & meters 21
Ammeter Schematic Energy meter Schematic Voltmeter Schematic Power quality analyzer Schematic Ampere-hour meter Schematic Power factor meter Schematic Frequency meter Schematic Varmeter Schematic Wattmeter Schematic Protection relay 21 (distance) Schematic Protection relay 25 (synchro-check) Schematic Protection relay 27/59 (under/overvoltage) Schematic Protection relay 32 (reverse power) Schematic Protection relay 46 (negative sequence) Schematic Protection relay 49 (thermal overload) Schematic Protection relay 50/51 (instantaneous/time overcurrent) Schematic Protection relay 50N/51N (ground overcurrent) Schematic Protection relay 67 (directional overcurrent) Schematic Protection relay 81 (frequency) Schematic Protection relay 86 (lockout) Schematic Protection relay 87 (differential) Schematic Contacts, coils & control devices 29
Buzzer Schematic Contactor coil Schematic Relay coil Schematic Changeover contact Schematic NC contact Schematic NO contact Schematic Off-delay timed contact Schematic On-delay timed contact Schematic Horn (acoustic signal) Schematic Indicator lamp Schematic NC limit switch Schematic NO limit switch Schematic PLC digital input Schematic PLC digital output Schematic Emergency stop pushbutton Schematic NC pushbutton Schematic NO pushbutton Schematic Two-position selector switch Schematic Three-position selector switch Schematic Solenoid valve (coil) Schematic Flow switch contact Schematic Level switch contact Schematic Pressure switch contact Schematic Thermostat contact Schematic PLC analog input module (2 ch) Schematic PLC analog output module (2 ch) Schematic PLC digital input module (4 ch + COM) Schematic PLC digital output module (4 ch + COM) Schematic Safety relay with terminals Schematic Electronic components 14
Bridge rectifier Schematic Capacitor Schematic Polarized capacitor Schematic Diode Schematic Inductor / coil Schematic LED (light emitting diode) Schematic Potentiometer Schematic Resistor Schematic Variable resistor Schematic Thyristor (SCR) Schematic NPN transistor Schematic PNP transistor Schematic Triac Schematic Zener diode Schematic Conductors, earthing & connections 27
Antenna Schematic Conductor (wire) Schematic Crossing without connection Schematic Protective earth Schematic Frame / chassis Schematic Earth (ground) Schematic Crossing with connection Schematic PE terminal Schematic Terminal Schematic Cable termination (sealing end) Schematic Cable joint (splice) Schematic Underground cable Schematic Three-conductor line Schematic Line 3P + N + PE Schematic Neutral conductor (N) Schematic Protective conductor (PE) Schematic PEN conductor Schematic Earth rod (electrode) Schematic Earth grid (mesh) Schematic Noiseless (clean) earth Schematic Neutral earthing (service earth) Schematic Overhead line Schematic Link line (from elsewhere) Schematic Link line (continues elsewhere) Schematic Load (generic) Schematic Star point with neutral Schematic Point of common coupling (PCC) Schematic Ladder diagram symbols 46
Interlocked rungs (two contactors) Schematic Ladder power rails L1/L2 Schematic Start-stop rung with seal-in Schematic Circuit breaker CB (NEMA) Schematic Three-pole circuit breaker (NEMA) Schematic Control relay coil (CR) Schematic Motor starter coil (M) Schematic NC contact (NEMA) Schematic NO contact (NEMA) Schematic Control transformer Schematic Counter (CTU) Schematic Control relay CR with contacts Schematic Emergency stop mushroom (NEMA) Schematic Flow switch NC (NEMA) Schematic Flow switch NO (NEMA) Schematic Fuse (NEMA) Schematic Alarm horn (NEMA) Schematic Level switch NC (NEMA) Schematic Level switch NO (NEMA) Schematic Limit switch NC (NEMA) Schematic Limit switch NC, held open (NEMA) Schematic Limit switch NO (NEMA) Schematic Limit switch NO, held closed (NEMA) Schematic Direct-on-line motor starter (power) Schematic Overload contact NC (OL) Schematic Overload heater element (OL) Schematic Pushbutton NC (NEMA) Schematic Pushbutton NO (NEMA) Schematic Pilot light amber (A) Schematic Pilot light blue (B) Schematic Pilot light green (G) Schematic Pilot light red (R) Schematic Pilot light white (W) Schematic Pressure switch NC (NEMA) Schematic Pressure switch NO (NEMA) Schematic 2-position selector switch (NEMA) Schematic 3-position selector switch (NEMA) Schematic Start/stop pushbutton station Schematic Temperature switch NC (NEMA) Schematic Temperature switch NO (NEMA) Schematic Timer coil, off-delay Schematic Timer coil, on-delay Schematic Off-delay contact NC (NEMA) Schematic Off-delay contact NO (NEMA) Schematic On-delay contact NC (NEMA) Schematic On-delay contact NO (NEMA) Schematic Lighting on floor plans 19
Beacon light (flashing) Schematic Rotating beacon Schematic Surface ceiling luminaire Schematic Recessed downlight Schematic Emergency luminaire Schematic Illuminated exit sign Schematic Explosion-proof luminaire (Ex) Schematic Floodlight Schematic Fluorescent luminaire (single tube) Schematic Fluorescent luminaire with emergency pack Schematic Fluorescent luminaire (twin tube) Schematic Industrial high-bay luminaire Schematic Linear LED luminaire Schematic Recessed panel luminaire (suspended ceiling) Schematic Adjustable spotlight Schematic Lighting pole (single arm) Schematic Lighting pole (double arm) Schematic Wall-mounted luminaire (bracket) Schematic Watertight luminaire (IP65) Schematic Switches & sockets on floor plans 23
Single-phase socket outlet Schematic Double socket outlet Schematic Three-phase socket outlet (3-pole) Schematic Three-phase socket outlet with neutral and earth (5-pole) Schematic CEE industrial socket 3P+E 16 A Schematic CEE industrial socket 3P+N+E 32 A Schematic CEE industrial socket 3P+N+E 63 A Schematic Data outlet (RJ45) Schematic Floor socket box Schematic Weatherproof socket outlet (IP44) Schematic Earthed socket outlet (Schuko type) Schematic Telephone outlet Schematic Two-way switch (plan) Schematic Dimmer switch Schematic Double-pole switch (plan) Schematic Intermediate (cross) switch (plan) Schematic Photocell / twilight switch Schematic Ceiling presence detector (PIR) Schematic Wall presence detector (PIR) Schematic Pull-cord switch Schematic Push button (bell push) (plan) Schematic Single-pole switch (plan) Schematic Timer switch (plan) Schematic Lamps, pushbuttons & sounders on plans 25
Pilot lamp blue (B) Schematic Flashing pilot lamp red (R) Schematic Flashing pilot lamp yellow (Y) Schematic Pilot lamp green (G) Schematic Pilot lamp red (R) Schematic Pilot lamp white (W) Schematic Pilot lamp yellow (Y) Schematic Pushbutton blue blue (NO) (B) Schematic Double pushbutton start/stop (I/O) Schematic Pushbutton green start (NO) (G) Schematic Illuminated pushbutton green (G) Schematic Illuminated pushbutton red (R) Schematic Illuminated pushbutton yellow (Y) Schematic Pushbutton red stop (NC) (R) Schematic Pushbutton white white (NO) (W) Schematic Pushbutton yellow yellow (NO) (Y) Schematic Electric bell Schematic Signal tower, 1 level (red) Schematic Signal tower, 2 levels (R-G) Schematic Signal tower R-Y-G with buzzer Schematic Signal tower, 3 levels (R-Y-G) Schematic Signal tower, 4 levels (R-Y-G-B) Schematic Signal tower, 5 levels (R-Y-G-B-W) Schematic Combined sounder-beacon (horn + lamp) Schematic Siren Schematic
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