Industrial electrical symbols
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The document provides symbols and diagrams for various industrial electrical components. It includes symbols for circuit breakers, switches, relays, meters, transformers, motors, wiring diagrams, semiconductors and other devices. The symbols are used in electrical schematics to represent the components.
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Industrial electrical symbols
- 1. INDUSTRIAL ELECTRICAL SYMBOLS . . . CIRCUIT BREAKER DISCONNECT CIRCUIT CIRCUIT BREAKER CIRCUIT BREAKER W/ THERMAL AND INTERRUPTER WITH THERMAL OL WITH MAGNETIC OL MAGNETIC OL LIMIT SWITCHES PRESSURE AND LIQUID TEMPERATURE- FOOT VACUUM LEVEL ACTUATED FLOW SWITCH NORMALLY NORMALLY SWITCHES (AIR, WATER, ETC.) OPEN CLOSED SWITCHES SWITCH SWITCH NO NO NO NO NO HELD HELD CLOSED OPEN NC NC NC NC NC SYMBOLS FOR STATIC SWITCHING CONTROL DEVICES SPEED (PLUGGING) ANTI-PLUG STATIC SWITCHING CONTROL IS A METHOD OF SWITCHING ELECTRICAL CIRCUITS WITHOUT USE OF CONTACTS, F F F PRIMARILY BY SOLID-STATE DEVICES. USE SYMBOLS SHOWN IN TABLE AND ENCLOSE THEM IN A DIAMOND. INPUT COIL OUTPUT NO LIMIT SWITCH NO LIMIT SWITCH NC R R SELECTOR TWO-POSITION THREE-POSITION TWO-POSITION SELECTOR PUSHBUTTON SELECTOR POSITION J K K J K J L J K L A B A B CONTACTS A1 A1 1 2 BUTTON BUTTON A1 X A1 X FREE DEPRESSED FREE DEPRESSED A2 A2 3 4 A2 X A2 X 1 2 X 3 4 X X X X-CONTACT CLOSED X-CONTACT CLOSED X - CONTACT CLOSED PUSHBUTTONS MOMENTARY CONTACT MAINTAINED CONTACT ILLUMINATED SINGLE DOUBLE MUSHROOM WOBBLE TWO ONE CIRCUIT CIRCUIT HEAD STICK SINGLE DOUBLE CIRCUIT CIRCUIT R NO AND NC NO NC ©1999 American Technical Publishers, Inc.
- 2. . . . INDUSTRIAL ELECTRICAL SYMBOLS . . . CONTACTS OVERLOAD RELAYS TIMED CONTACTS - CONTACT ACTION THERMAL MAGNETIC INSTANT OPERATING RETARDED AFTER COIL IS: WITH BLOWOUT WITHOUT BLOWOUT ENERGIZED DE-ENERGIZED NO NC NO NC NOTC NCTO NOTO NCTC SUPPLEMENTARY CONTACT SYMBOLS SPST NO SPST NC SPDT TERMS SINGLE DOUBLE SINGLE DOUBLE SINGLE DOUBLE BREAK BREAK BREAK BREAK BREAK BREAK SPST SINGLE-POLE, SINGLE-THROW SPDT SINGLE-POLE, DOUBLE-THROW DPST DOUBLE-POLE, DPST, 2NO DPST, 2NC DPDT SINGLE-THROW SINGLE DOUBLE SINGLE DOUBLE SINGLE DOUBLE DPDT BREAK BREAK BREAK BREAK BREAK BREAK DOUBLE-POLE, DOUBLE-THROW NO NORMALLY OPEN NC NORMALLY CLOSED METER (INSTRUMENT) PILOT LIGHTS INDICATE TO INDICATE FUNCTION OF METER OR INSTRUMENT, INDICATE COLOR BY LETTER TYPE BY PLACE SPECIFIED LETTER OR LETTERS WITHIN SYMBOL. LETTER NON PUSH-TO-TEST PUSH-TO-TEST AM or A AMMETER VA VOLTMETER V AH AMPERE HOUR VAR VARMETER A MICROAMMETER VARH VARHOUR METER A R mA MILLAMMETER W WATTMETER AM PF POWER FACTOR WH WATTHOUR METER V VOLTMETER INDUCTORS COILS IRON CORE DUAL-VOLTAGE MAGNET COILS BLOWOUT COIL HIGH-VOLTAGE LOW-VOLTAGE LINK LINKS 1 2 3 4 1 2 3 4 AIR CORE ©1999 American Technical Publishers, Inc.
- 3. . . . INDUSTRIAL ELECTRICAL SYMBOLS . . . TRANSFORMERS AUTO AIR CORE CURRENT CONTROL TRANSFORMER AUTOTRANSFORMER FOR REDUCED- VOLTAGE STARTING SINGLE- DUAL- VOLTAGE VOLTAGE % % 50 50 H3 H2 H1 H2 H1 H4 65 65 80 80 100 100 X2 X1 X2 X1 0 0 AC MOTORS SINGLE- SEPARATE PHASE, SEPARATE WINDING, CONSTANT-TORQUE, THREE-PHASE PHASE TWO-SPEED TWO-SPEED TWO-SPEED T1 T2 HIGH COM LOW T1 T2 T3 T1 T11 T4 T1 T2 T3 T3 T1 T3 T2 T13 T12 T5 T2 T6 VARIABLE-TORQUE, CONSTANT- WYE/DELTA, WYE-CONNECTED, PART WINDING, TWO-SPEED HORSEPOWER, REDUCED- REDUCED-VOLTAGE TWO-SPEED VOLTAGE T4 T4 T1 T2 T3 T7 T8 T9 T5 T6 T1 T1 T3 T1 T3 T3 T4 T4 T6 T2 T6 T5 T6 T5 T2 T5 T2 DC MOTORS WIRING CONNECTIONS COMM OR NOT WIRING MECHANICAL SHUNT SERIES COMPENS POWER ARMATURE FIELD FIELD CONNECTED TERMINAL FIELD ARM SHOW 4 SHOW 3 SHOW 2 LOOPS LOOPS LOOPS MECHANICAL CONNECTED CONTROL GROUND INTERLOCK CONTROL AND POWER CONNECTIONS-600 V OR LESS ACROSS-THE-LINE STARTERS 1 2 , 4-WIRE 3 L1, L3 PHASE 1 LINE MARKINGS L1, L2 L1, L2, L3 L2, L4 PHASE 2 L1 IS ALWAYS GROUND WHEN USED UNGROUNDED L2 MOTOR RUNNING 1 ELEMENT L1 OVERCURRENT 2 ELEMENT L1, L4 UNITS IN 3 ELEMENT L1, L2, L3 CONTROL CIRCUIT L1, L2 L1, L3 L1, L2 CONNECTED TO FOR REVERSING L1, L3 L1, L3 INTERCHANGE LINES ©1999 American Technical Publishers, Inc.
- 4. . . . INDUSTRIAL ELECTRICAL SYMBOLS RESISTORS CAPACITORS ADJUSTABLE BY RHEOSTAT, POT, OR FIXED FIXED ADJUSTABLE POLARIZED FIXED TAPS ADJUSTABLE TAP RES + _ H RES RES HEATING ELEMENT FUSE BELL BUZZER HORN, HALF-WAVE FULL-WAVE SIREN, ETC. RECTIFIER RECTIFIER POWER OR CONTROL AC + _ DC DC AC BATTERY IGNITRON SEMICONDUCTORS . . . THERMOCOUPLE TUBE TUNNEL UNIDIRECTIONAL DIODE BREAKDOWN DIODE DOT IN TUBE (ZENER) DIODE DENOTES GAS + _ . . . SEMICONDUCTORS . . . BIDIRECTIONAL TRIAC SILICON PROGRAMMABLE PHOTOSENSITIVE BREAKDOWN (BIDIRECTIONAL CONTROLLED UNIT - JUNCTION CELL DIODE TRIODE THYRISTOR) RECTIFIER TRANSISTOR (PUT) . . . SEMICONDUCTORS TRANSISTOR UNIJUNCTION TRANSISTOR PNP BASE NPN BASE P BASE N BASE (C) (C) (B2) (B2) (E) (E) (B) (B) (E) (E) (B1) (B1) ©1999 American Technical Publishers, Inc.