Mechanical circuit diagram symbol

Photocoupler

This section provides a comprehensive list of electrical and electronic component symbols commonly used in circuit diagrams. These symbols are essential for engineers, technicians, and students to understand and interpret electrical systems accurately. Here is a detailed breakdown of the most frequently used components:

- **Ammeter (PA)**: Measures electric current in amperes.
- **Voltmeter (PV)**: Measures voltage across a circuit.
- **Active Energy Meter (PJ)**: Measures active electrical energy consumed.
- **Reactive Energy Meter (PJR)**: Measures reactive energy in an AC system.
- **Frequency Meter (PF)**: Displays the frequency of an AC supply.
- **Phase Meter (PPA)**: Indicates the phase angle between voltage and current.
- **Maximum Demand Meter (PM)**: Tracks the highest power demand over a specific period.
- **Power Factor Meter (PPF)**: Shows the ratio of real power to apparent power.
- **Active Power Meter (PW)**: Measures real power in watts.
- **Reactive Power Meter (PR)**: Measures reactive power in volt-amperes reactive (VAR).
- **Reactive Current Meter (PAR)**: Measures the reactive component of current.
- **Acoustic Signal (HA)**: Represents sound alarms or indicators.
- **Optical Signal (HS)**: Indicates light-based signals or warnings.
- **Indicator Light (HL)**: General-purpose indicator light.
- **Red Light (HR)**, **Green Light (HG)**, **Yellow Light (HY)**, **Blue Light (HB)**, **White Light (HW)**: Color-coded lights for status indication.

- **Connecting Piece (XB)**: A connector or link between circuits.
- **Plug (XP)**: A device for connecting cables or components.
- **Socket (XS)**: Receptacle for plugs.
- **Terminal Board (XT)**: A board with terminals for wiring connections.
- **Wire, Cable, Busbar (W)**: General symbol for conductors.
- **DC Bus (WB)**: Direct current busbar.
- **Plug-in Busbar (WIB)**: Removable busbar for easy connection.
- **Power Branch Line (WP)**: Main line supplying power to a circuit.
- **Lighting Branch Line (WL)**: Circuit for lighting purposes.
- **Emergency Lighting Branch Line (WE)**: Backup lighting circuit.
- **Power Mains (WPM)**: Main power supply lines.
- **Lighting Trunk (WLM)**: Central line for lighting distribution.
- **Emergency Lighting Trunk (WEM)**: Central emergency lighting line.

This list continues with more components such as switches, relays, motors, sensors, resistors, capacitors, and more, each playing a crucial role in various electrical and automation systems. Understanding these symbols is fundamental for anyone working with electrical schematics or control systems.