Drawing conventions

ANSI / IEEE symbol forms

116 explicitly identified drawing forms. Each record names its convention evidence and explains the meaning and drafting context. The broader symbol collection also includes general concepts relevant to multiple conventions.

What this collection means

ANSI/IEEE graphical forms are separate from device-function numbers such as 50, 51 and 87. The forms here are identified from the cited public vendor convention references. IEEE/ANSI 315 and 315A provide standards context; IEEE lists both as Inactive-Reserved. That status is relevant when interpreting legacy drawings and choosing the required project convention.

A related representation expresses a comparable function in the cited context. It does not establish identical graphic construction, terminal numbering or compliance. These original educational illustrations are not a reproduced or certified standards library.

IEEE/ANSI 315 status and scope · IEEE/ANSI 315A supplement · Device functions

Selected comparisons

ANSI/IEEE circuit breaker symbolView the function and drafting differences side by side →ANSI/IEEE thermal circuit breaker symbolView the function and drafting differences side by side →ANSI/IEEE thermal-magnetic circuit breaker symbolView the function and drafting differences side by side →ANSI/IEEE current-limiting circuit breaker symbolView the function and drafting differences side by side →ANSI/IEEE circuit breaker with undervoltage release symbolView the function and drafting differences side by side →ANSI/IEEE circuit breaker with electronic trip unit symbolView the function and drafting differences side by side →

Explicitly identified forms

ANSI/IEEE circuit breaker symbol

IEEE-oriented graphical reference for circuit breaker, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

CB TH

ANSI/IEEE thermal circuit breaker symbol

IEEE-oriented graphical reference for thermal circuit breaker, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

CB TM

ANSI/IEEE thermal-magnetic circuit breaker symbol

IEEE-oriented graphical reference for thermal-magnetic circuit breaker, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

CB LIM

ANSI/IEEE current-limiting circuit breaker symbol

IEEE-oriented graphical reference for current-limiting circuit breaker, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

CB UV

ANSI/IEEE circuit breaker with undervoltage release symbol

IEEE-oriented graphical reference for circuit breaker with undervoltage release, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

CB ETU

ANSI/IEEE circuit breaker with electronic trip unit symbol

IEEE-oriented graphical reference for circuit breaker with electronic trip unit, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

Isolator

ANSI/IEEE disconnector symbol

IEEE-oriented graphical reference for disconnector, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

ANSI/IEEE switch-disconnector symbol

IEEE-oriented graphical reference for switch-disconnector, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

DS LOCK

ANSI/IEEE lockable disconnector symbol

IEEE-oriented graphical reference for lockable disconnector, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

SD LOCK

ANSI/IEEE lockable switch-disconnector symbol

IEEE-oriented graphical reference for lockable switch-disconnector, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

SW FUSE

ANSI/IEEE fused switch symbol

IEEE-oriented graphical reference for fused switch, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

ANSI/IEEE fuse symbol

IEEE-oriented graphical reference for fuse, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

FUSE SW

ANSI/IEEE fuse-switch symbol

IEEE-oriented graphical reference for fuse-switch, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

ANSI/IEEE current transformer symbol

IEEE-oriented graphical reference for current transformer, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

CT 2SEC

ANSI/IEEE current transformer with two secondaries symbol

IEEE-oriented graphical reference for current transformer with two secondaries, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

CT TAP

ANSI/IEEE tapped-secondary current transformer symbol

IEEE-oriented graphical reference for tapped-secondary current transformer, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

VT / PT

ANSI/IEEE voltage transformer symbol

IEEE-oriented graphical reference for voltage transformer, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

ANSI/IEEE power transformer symbol

IEEE-oriented graphical reference for power transformer, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

TX SCREEN

ANSI/IEEE electrostatically screened transformer symbol

IEEE-oriented graphical reference for electrostatically screened transformer, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

TX 3W

ANSI/IEEE three-winding transformer symbol

IEEE-oriented graphical reference for three-winding transformer, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

TX ADJ

ANSI/IEEE adjustable-ratio transformer symbol

IEEE-oriented graphical reference for adjustable-ratio transformer, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

AT 1PH

ANSI/IEEE single-phase autotransformer symbol

IEEE-oriented graphical reference for single-phase autotransformer, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

ANSI/IEEE reactor symbol

IEEE-oriented graphical reference for reactor, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

L IRON

ANSI/IEEE iron-core reactor symbol

IEEE-oriented graphical reference for iron-core reactor, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

L GAP

ANSI/IEEE gapped-core inductor symbol

IEEE-oriented graphical reference for gapped-core inductor, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

L ADJ

ANSI/IEEE adjustable-core inductor symbol

IEEE-oriented graphical reference for adjustable-core inductor, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

ANSI/IEEE normally open contact symbol

IEEE-oriented graphical reference for normally open contact, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

ANSI/IEEE normally closed contact symbol

IEEE-oriented graphical reference for normally closed contact, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

ANSI/IEEE changeover contact symbol

IEEE-oriented graphical reference for changeover contact, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

Coil

ANSI/IEEE relay coil symbol

IEEE-oriented graphical reference for relay coil, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

K LATCH

ANSI/IEEE mechanically latched relay coil symbol

IEEE-oriented graphical reference for mechanically latched relay coil, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

K RESET

ANSI/IEEE relay reset coil symbol

IEEE-oriented graphical reference for relay reset coil, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

K POL

ANSI/IEEE polarised relay coil symbol

IEEE-oriented graphical reference for polarised relay coil, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

K AC

ANSI/IEEE ac relay coil symbol

IEEE-oriented graphical reference for ac relay coil, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

K DIODE

ANSI/IEEE relay coil with diode suppression symbol

IEEE-oriented graphical reference for relay coil with diode suppression, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

K RC

ANSI/IEEE relay coil with rc suppression symbol

IEEE-oriented graphical reference for relay coil with rc suppression, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

TON

ANSI/IEEE on-delay timer relay symbol

IEEE-oriented graphical reference for on-delay timer relay, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

TOFF

ANSI/IEEE off-delay timer relay symbol

IEEE-oriented graphical reference for off-delay timer relay, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

NO HOLD

ANSI/IEEE maintained normally-open contact symbol

IEEE-oriented graphical reference for maintained normally-open contact, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

NC HOLD

ANSI/IEEE maintained normally-closed contact symbol

IEEE-oriented graphical reference for maintained normally-closed contact, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

NO EARLY

ANSI/IEEE early-make normally-open contact symbol

IEEE-oriented graphical reference for early-make normally-open contact, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

NO LATE

ANSI/IEEE late-make normally-open contact symbol

IEEE-oriented graphical reference for late-make normally-open contact, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

NC EARLY

ANSI/IEEE early-break normally-closed contact symbol

IEEE-oriented graphical reference for early-break normally-closed contact, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

NC LATE

ANSI/IEEE late-break normally-closed contact symbol

IEEE-oriented graphical reference for late-break normally-closed contact, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

OL NC

ANSI/IEEE motor overload trip nc contact symbol

IEEE-oriented graphical reference for motor overload trip nc contact, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

OL NO

ANSI/IEEE motor overload alarm no contact symbol

IEEE-oriented graphical reference for motor overload alarm no contact, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

PB NO

ANSI/IEEE normally open pushbutton symbol

IEEE-oriented graphical reference for normally open pushbutton, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

PB NC

ANSI/IEEE normally closed pushbutton symbol

IEEE-oriented graphical reference for normally closed pushbutton, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

PB NO LAMP

ANSI/IEEE illuminated normally-open pushbutton symbol

IEEE-oriented graphical reference for illuminated normally-open pushbutton, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

PB NC LAMP

ANSI/IEEE illuminated normally-closed pushbutton symbol

IEEE-oriented graphical reference for illuminated normally-closed pushbutton, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

PB NO HOLD

ANSI/IEEE maintained normally-open pushbutton symbol

IEEE-oriented graphical reference for maintained normally-open pushbutton, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

PB NC HOLD

ANSI/IEEE maintained normally-closed pushbutton symbol

IEEE-oriented graphical reference for maintained normally-closed pushbutton, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

ANSI/IEEE selector switch symbol

IEEE-oriented graphical reference for selector switch, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

SEL 3 HOLD

ANSI/IEEE three-position maintained selector symbol

IEEE-oriented graphical reference for three-position maintained selector, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

SEL 3 CRET

ANSI/IEEE three-position centre-return selector symbol

IEEE-oriented graphical reference for three-position centre-return selector, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

KEY SEL 3

ANSI/IEEE three-position key selector symbol

IEEE-oriented graphical reference for three-position key selector, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

SEL 4 HOLD

ANSI/IEEE four-position maintained selector symbol

IEEE-oriented graphical reference for four-position maintained selector, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

KEY SEL 4

ANSI/IEEE four-position key selector symbol

IEEE-oriented graphical reference for four-position key selector, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

LS NO

ANSI/IEEE normally-open limit switch symbol

IEEE-oriented graphical reference for normally-open limit switch, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

LS NC

ANSI/IEEE normally-closed limit switch symbol

IEEE-oriented graphical reference for normally-closed limit switch, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

LS ROLLER

ANSI/IEEE roller-operated limit switch symbol

IEEE-oriented graphical reference for roller-operated limit switch, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

PS NO

ANSI/IEEE pressure switch no symbol

IEEE-oriented graphical reference for pressure switch no, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

PS NC

ANSI/IEEE pressure switch nc symbol

IEEE-oriented graphical reference for pressure switch nc, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

TS NO

ANSI/IEEE temperature switch no symbol

IEEE-oriented graphical reference for temperature switch no, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

TS NC

ANSI/IEEE temperature switch nc symbol

IEEE-oriented graphical reference for temperature switch nc, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

LS FLOAT NO

ANSI/IEEE float level switch no symbol

IEEE-oriented graphical reference for float level switch no, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

LS FLOAT NC

ANSI/IEEE float level switch nc symbol

IEEE-oriented graphical reference for float level switch nc, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

FS LIQ

ANSI/IEEE liquid flow switch symbol

IEEE-oriented graphical reference for liquid flow switch, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

Terminal

ANSI/IEEE terminal connection symbol

IEEE-oriented graphical reference for terminal connection, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

TERM 1

ANSI/IEEE numbered terminal symbol

IEEE-oriented numbered connection-point form, with public vendor evidence and terminal-reading notes.

IEEE / ANSI

PLUG SOCKET

ANSI/IEEE plug and socket connector pair symbol

IEEE-oriented graphical reference for plug and socket connector pair, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

PLUG

ANSI/IEEE connector plug half symbol

IEEE-oriented graphical reference for connector plug half, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

SOCKET

ANSI/IEEE connector socket half symbol

IEEE-oriented graphical reference for connector socket half, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

SPLICE

ANSI/IEEE wire splice symbol

IEEE-oriented graphical reference for wire splice, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

ANSI/IEEE protective earth symbol

IEEE-oriented graphical reference for protective earth, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

ANSI/IEEE functional earth symbol

IEEE-oriented graphical reference for functional earth, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

ANSI/IEEE resistor symbol

IEEE-oriented graphical reference for resistor, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

R VAR

ANSI/IEEE variable resistor symbol

IEEE-oriented graphical reference for variable resistor, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

POT

ANSI/IEEE potentiometer symbol

IEEE-oriented graphical reference for potentiometer, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

LDR

ANSI/IEEE light-dependent resistor symbol

IEEE-oriented graphical reference for light-dependent resistor, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

HEATER

ANSI/IEEE heating element symbol

IEEE-oriented graphical reference for heating element, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

VDR

ANSI/IEEE varistor symbol

IEEE-oriented graphical reference for varistor, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

SHUNT

ANSI/IEEE current-measuring shunt symbol

IEEE-oriented graphical reference for current-measuring shunt, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

ANSI/IEEE capacitor symbol

IEEE-oriented graphical reference for capacitor, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

C ELEC

ANSI/IEEE electrolytic capacitor symbol

IEEE-oriented graphical reference for electrolytic capacitor, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

C FEED

ANSI/IEEE feedthrough capacitor symbol

IEEE-oriented graphical reference for feedthrough capacitor, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

C ADJ

ANSI/IEEE adjustable capacitor symbol

IEEE-oriented graphical reference for adjustable capacitor, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

ANSI/IEEE diode symbol

IEEE-oriented graphical reference for diode, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

ANSI/IEEE photodiode symbol

IEEE-oriented graphical reference for photodiode, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

ANSI/IEEE zener diode symbol

IEEE-oriented graphical reference for zener diode, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

BR 1PH

ANSI/IEEE single-phase bridge rectifier symbol

IEEE-oriented graphical reference for single-phase bridge rectifier, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

SCR

ANSI/IEEE silicon-controlled rectifier symbol

IEEE-oriented graphical reference for silicon-controlled rectifier, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

TRIAC

ANSI/IEEE triac symbol

IEEE-oriented graphical reference for triac, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

ANSI/IEEE voltmeter symbol

IEEE-oriented graphical reference for voltmeter, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

ANSI/IEEE ammeter symbol

IEEE-oriented graphical reference for ammeter, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

ANSI/IEEE power-factor meter symbol

IEEE-oriented graphical reference for power-factor meter, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

ANSI/IEEE frequency meter symbol

IEEE-oriented graphical reference for frequency meter, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

W REC

ANSI/IEEE recording wattmeter symbol

IEEE-oriented graphical reference for recording wattmeter, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

var

ANSI/IEEE reactive-power meter symbol

IEEE-oriented graphical reference for reactive-power meter, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

SYNC SCOPE

ANSI/IEEE synchronoscope symbol

IEEE-oriented graphical reference for synchronoscope, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

HOURS

ANSI/IEEE running-hours meter symbol

IEEE-oriented graphical reference for running-hours meter, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

M 1PH AC

ANSI/IEEE single-phase ac motor symbol

IEEE-oriented graphical reference for single-phase ac motor, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

M 3PH

ANSI/IEEE three-phase ac motor symbol

IEEE-oriented graphical reference for three-phase ac motor, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

M WR

ANSI/IEEE wound-rotor induction motor symbol

IEEE-oriented graphical reference for wound-rotor induction motor, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

M DC

ANSI/IEEE dc motor symbol

IEEE-oriented graphical reference for dc motor, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

M DC PM

ANSI/IEEE permanent-magnet dc motor symbol

IEEE-oriented graphical reference for permanent-magnet dc motor, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

G 3PH SYNC

ANSI/IEEE three-phase synchronous generator symbol

IEEE-oriented graphical reference for three-phase synchronous generator, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

G DC

ANSI/IEEE dc generator symbol

IEEE-oriented graphical reference for dc generator, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

Lamp

ANSI/IEEE indicator lamp symbol

IEEE-oriented graphical reference for indicator lamp, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

LAMP TX

ANSI/IEEE transformer-fed indicator lamp symbol

IEEE-oriented graphical reference for transformer-fed indicator lamp, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

LAMP TEST

ANSI/IEEE push-to-test indicator lamp symbol

IEEE-oriented graphical reference for push-to-test indicator lamp, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

LAMP LED

ANSI/IEEE led indicator lamp symbol

IEEE-oriented graphical reference for led indicator lamp, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

TON NO

ANSI/IEEE on-delay normally-open contact symbol

IEEE-oriented graphical reference for on-delay normally-open contact, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

TON NC

ANSI/IEEE on-delay normally-closed contact symbol

IEEE-oriented graphical reference for on-delay normally-closed contact, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

TOFF NO

ANSI/IEEE off-delay normally-open contact symbol

IEEE-oriented graphical reference for off-delay normally-open contact, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

TOFF NC

ANSI/IEEE off-delay normally-closed contact symbol

IEEE-oriented graphical reference for off-delay normally-closed contact, with public vendor evidence and drawing-reading notes.

IEEE / ANSI

Related general concepts

These 29 records explain functions relevant to this reference family. They do not assign a single convention to their educational illustration.

Current transformerA current-measurement transformer used with metering and protection equipment.Voltage transformerA transformer providing a voltage signal for metering or protection.Circuit breakerA switching device that can interrupt a circuit, with specified fault-interruption capability.DisconnectorA switching device providing an electrical isolation function.Load-break switchA switch with a specified capability to make and break normal load current.Earthing switchA switch used to connect an identified circuit section to earth.FuseAn overcurrent protective element that interrupts a circuit by melting its fuse link.BusbarA common conductive connection distributing power to connected circuits.Normally open contactA contact shown open in the normal state defined for its device.Normally closed contactA contact shown closed in the normal state defined for its device.Changeover contactA contact arrangement switching a common connection between two contact paths.Relay coilThe operating element associated with a relay and its separately drawn contacts.ContactorAn electrically operated switching device commonly used for repeated switching duties.Normally open pushbuttonA pushbutton contact normally shown open before actuation.Normally closed pushbuttonA pushbutton contact normally shown closed before actuation.Emergency-stop operatorAn identified emergency-stop operator and its documented contact arrangement.Selector switchAn operator switch selecting between documented control positions.Indicator lampA visual indicator associated with a documented control or equipment condition.Terminal connectionAn identified electrical connection point linking schematic and wiring information.CT test terminalA current-transformer terminal arrangement providing documented test and shorting facilities.Power transformerEquipment transferring electrical power between winding circuits.GeneratorAn electrical generating source represented in a power-system drawing.Three-phase motorAn electrical motor load connected to its switching and protective equipment.PLC input / outputA controller interface point connecting field signals to an identified module channel.CapacitorA capacitive component or bank identified with its circuit function and ratings.ResistorA resistive component with its value and purpose documented separately.Protective earthAn identified connection serving the protective earthing function.BatteryAn electrochemical electrical source or storage element represented in a circuit.Power converter / inverterAn identified interface converting electrical power between documented circuit forms.