The following codes which vary slightly from the American codes are in common use in European and Australian standard electrical circuit diagrams. These codes are used for the "reference designators" printed on PCBs (which match the corresponding ones written on the corresponding schematic).
• A: Assemblies
• B: Transducers (photo cells, inductive proximity, thermocouple, flame detection)
• C: Capacitors
• D: Storage devices
• E: Miscellaneous
• F: Fuses
• G: Generator, battery pack
• H: Indicators, lamps (not for illumination), signalling devices
• K: Relays, contactors
• L: Inductors and filters
• M: Motors
• N: Analogue devices
• P: Measuring/test equipment
• Q: Circuit breakers, isolators, re-closers
• R: Resistors, brake resistors
• S: Switches, push buttons, emergency stops and limit switches
• T: Transformers
• U: Power converters, variable speed drives, soft starters, DC power supplies
• V: Semiconductors
• W: Wires, conductors, power, neutral and earthing busses
• X: Terminal strips, terminations, joins
• Y: Solenoids, electrical actuators
• Z: Filters
Detailed rules for reference designations are provided in the International standard IEC 61346 .
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