Based on GOST 2.710-81. This page is not the original document. Translation may be inaccurate.
Elements of electrical circuits can have both a single-letter and two-letter designation.
1. The letters of the most common types of elements are given in Table 1.
Table 1
First letter of code (required) | Group kinds of elements | Examples of kinds of elements |
А | Devices | Amplifiers, telecontrol devices, lasers, masers |
В | Converters of non-electrical quantities to electrical (other than generators and power supplies) or vice versa, analog or multi-digit converters or sensors for indicating or measuring | Loudspeakers, microphones, thermoelectric sensors, ionizing radiation detectors, pickups, selsyns |
С | Capacitors | |
D | Integrated circuits, microassemblies | Integrated analog and digital circuits, logic elements, memory devices, delay devices |
Е | Different elements | Lighting devices, heating elements |
F | Arresters, fuses, protective devices | Discrete protection elements for current and voltage, fuses, arresters |
G | Generators, power supplies, quartz oscillators | Batteries, electrochemical and electrothermal sources |
Н | Indicating and signaling devices | Sound and light signaling devices, indicators |
К | Relays, contactors, starters | Current and voltage relays, electrothermal relays, time relays, contactors, magnetic starters |
L | Inductors, chokes | Chokes for fluorescent lighting |
М | Motors | AC and DC motors |
Р | Devices, measuring equipment | Indicating, recording and measuring devices, counters, clocks |
Q | Switches and disconnectors in power circuits | Disconnectors, short-circuiting switches, circuit breakers (power) |
R | Resistors | Variable resistors, potentiometers, varistors, thermistors |
S | Switching devices in control, signaling and measuring circuits | Switches, switches triggered by various influences |
T | Transformers, autotransformers | Current and voltage transformers, stabilizers |
U | Converters of electrical quantities to electrical, communication devices | Modulators, demodulators, discriminators, inverters, frequency converters, rectifiers |
V | Electrovacuum, semiconductor devices | Electronic lamps, diodes, transistors, thyristors, zener diodes |
W | Lines and elements of ultrahigh frequency, antennas | Waveguides, dipoles, antennas |
X | Connections contact | Pins, nests, collapsible connections, current collectors |
Y | Mechanical devices with electromagnetic drive | Electromagnetic couplings, brakes, cartridges |
Z | Terminal devices, filters, limiters | Modeling line, quartz filters |
2. Examples of two-letter codes are given in Table 2
Table 2
First letter of code (required) | Group kinds of elements | Examples of kinds of elements | Two-letter code |
А | Device (general designation) | ||
В | Converters of non-electrical quantities to electrical (other than generators and power supplies) or vice versa, analog or multi-digit converters or sensors for indicating or measuring | Loudspeaker | ВА |
The magnetostrictive element | ВВ | ||
The ionizing radiation detector | BD | ||
Selsyn receiver | BE | ||
Phone (capsule) | ВF | ||
Celsin sensor | ВС | ||
Thermal sensor | ВК | ||
Photocell | BL | ||
Microphone | ВМ | ||
Pressure meter | ВР | ||
Piezoelement | BQ | ||
Tachogenerator | BR | ||
Pickup | BS | ||
Speed sensor | BV | ||
C | Capacitors | ||
D | Integrated circuits, microassemblies | Integrated analog circuit | DA |
Integrated circuit, digital, logic element | DD | ||
Storage devices | DS | ||
Delay device | DI | ||
Е | Different elements | Heating element | ЕК |
Lighting lamps | EL | ||
Pyropatron | ЕТ | ||
F | Arresters, fuses, protective devices | Discrete instantaneous protection element | FA |
Discrete protection element for electrical current, inertial action | FP | ||
Fuse | FU | ||
Discrete voltage protection element, arrester | FV | ||
G | Generators, power supplies | Battery | GB |
H | Indicating and signaling devices | Sound alarm device | HA |
Indicator symbolic | HG | ||
Light signal device | HL | ||
К | Relays, contactors, starters | Current relay | КА |
Indicative relay | КН | ||
Electrothermal relay | КК | ||
Contactor, magnetic starter | KM | ||
Time-delay relay | КТ | ||
Voltage relay | KV | ||
L | Inductors, chokes | Fluorescent lighting choke | LL |
М | Motors | ||
Р | Devices, measuring equipment Note. The combination of PE is not allowed | Ammeter | РА |
Pulse counter | PC | ||
Cymometer | PF | ||
Active energy meter | PI | ||
Counter of reactive energy | РК | ||
Ohmmeter | PR | ||
Recording device | PS | ||
Clock, time meter | PT | ||
Voltmeter | PV | ||
Wattmeter | PW | ||
Q | Switches and disconnectors in power circuits (power supply, equipment supply, etc.) | Automatic switch | QF |
Short-circuit switch | QK | ||
Disconnector | QS | ||
R | Resistors | Thermistor | RK |
Potentiometer | RP | ||
Measuring shunt | RS | ||
Varistor | RU | ||
S | Switching devices in control, signaling and measuring circuits Note. The designation SF is used for devices that do not have power-circuit contacts | Switch | SA |
Push Button Switch | SB | ||
Automatic switch | SF | ||
Switches triggered by various actions: | |||
Level | SL | ||
Pressures | SP | ||
Position | SQ | ||
Rotational speed | SR | ||
Temperature | SK | ||
Т | Transformers, autotransformers | Current transformer | TA |
Electromagnetic stabilizer | TS | ||
Voltage transformer | TV | ||
U | Communication devices Converters of electrical values in electrical | Модулятор | UB |
Demodulator | UR | ||
Discriminator | UI | ||
Frequency converter, inverter, frequency generator, rectifier | UZ | ||
V | Electrovacuum and semiconductor elemets | Diode, zener diode | VD |
Electrovacuum elemet | VL | ||
Transistor | VT | ||
Thyristor | VS | ||
W | Lines and elements of microwave Antennas | Coupler | WE |
Short-circuit switch | WK | ||
Ventil | WS | ||
Transformer, phase shifter | WT | ||
Attenuator | WU | ||
Antenna | WA | ||
X | Connections contact | Current collector, the sliding contact | XA |
Pin | XP | ||
Socket | XS | ||
Collapsible connection | XT | ||
High frequency connector | XW | ||
Y | Mechanical devices with electromagnetic drive | Electromagnet | YA |
Brake with electromagnetic drive | YB | ||
Coupling with electromagnetic drive | YC | ||
Electromagnetic cartridge | YH | ||
Z | End devices, filters Limiters | Limiter | ZL |
Quartz filter | ZQ |
1. Letter codes to indicate the functional purpose of the elements listed in Table 1
Table 1
Literal code | Functional purpose | Literal code | Functional purpose |
А | Auxiliary | N | Measuring |
В | Direction of movement (forward, backward, up, down, clockwise, counter-clockwise) | Р | Proportional |
C | Counting | Q | Status (start, stop, limit) |
D | Differentiating | R | Return, Reset |
F | Protective | S | Memorization, recording |
G | Test | T | Synchronization, delay |
Н | Signal | V | Speed (acceleration, deceleration) |
I | Integrating | W | Addition |
К | Pushing | X | Multiplication |
M | Main | Y | Analog |
Z | Digital |