Plug Connector Female Symbol
Definition: The Plug Connector Female symbol represents a socket-type electrical connector — commonly called a receptacle or socket — used in wiring and schematic diagrams to denote the panel-mounted or chassis-side connector half whose recessed socket contacts receive the pin contacts of a mating male plug connector, as defined by IEC 60617 connector symbol conventions and ANSI Y32.2 / IEEE 315-1975; the designator is J or P (convention varies, see standards section).
Also known as: female connector, socket connector, receptacle connector, female socket, jack (panel-mounted), female receptacle, connector socket, female jack, socket half, receptacle (ANSI).
What the Plug Connector Female symbol means
The Plug Connector Female symbol denotes the receiving half of a two-part separable connector pair. Female connectors house recessed socket contacts that grip and make electrical contact with the pin contacts of the mating male plug. In power connectors, the female socket is typically the fixed, panel-mounted, or chassis-integrated half that carries the energised live contacts inside a recessed cavity — a deliberate safety convention ensuring that live contacts are shielded and inaccessible when the male plug is removed.
In wiring and schematic diagrams, the Plug Connector Female symbol identifies a separable interface designed for repeated mating and un-mating without tools. Its Top and Bottom terminals represent the circuit contact positions. The symbol communicates that the chassis, panel, or PCB has a fixed, accessible socket point where cable plugs are inserted, enabling field service, cable replacement, and equipment interconnection without disturbing permanent wiring.
How to identify the Plug Connector Female symbol
The Plug Connector Female symbol is drawn as a rectangle or block with an inward-facing element — a recessed notch, hollow arc, or inward-pointing socket opening on the mating face — representing the socket contacts that receive the male pins. Two terminals labelled Top and Bottom exit the non-mating end. IEC 60617 uses a half-circle opening (concave face outward) on the mating side; ANSI Y32.2/IEEE 315 uses a rectangle with a notched or recessed face. The inward-facing socket geometry is the defining visual cue that distinguishes the female symbol from the outward-pointing male plug symbol.
Function in a circuit
The Female Socket Connector provides the fixed, receptive half of a field-separable electrical connection, accepting the male plug to complete the circuit. When mated, the socket contacts grip the pin contacts of the male plug, forming low-resistance electrical joints for power, signal, or data. The recessed socket geometry shields the live contacts from accidental touch when the male plug is disconnected, satisfying the safety requirements of IEC 60083, IEC 60309, and NFPA 70 for mains power connectors.
Standards: IEC vs ANSI
| IEC 60617 | IEC 60617 defines the female socket connector symbol as a concave (inward-facing) arc or notched face on the mating side, per IEC 60617-08. The product standards are IEC 60083 (domestic socket-outlets) and IEC 60309 (industrial socket-outlets). In IEC connector designation, the female socket is typically labelled F (female) or XS (socket) where a precise suffix is used. |
|---|---|
| ANSI/IEEE 315 | ANSI Y32.2 / IEEE 315-1975 uses a rectangle with an inward-facing notch or socket opening for the female connector. In ANSI/IEEE convention, J designates the chassis-side or equipment-mounted connector (which is often female), and P designates the cable-side connector (which is often male), though this assignment is not mandated by sex. |
| Key difference | IEC and ANSI use the same inward-facing geometry for the female connector symbol. The key difference is in designator labelling: IEC uses F (female) or the mating-pair suffix; ANSI uses J for equipment/chassis connectors (commonly female). In audio and RF engineering, 'jack' typically means the panel-mounted female socket, regardless of whether the ANSI J/P convention is followed. |
Terminals / pins
| Pin | Name |
|---|---|
| top | Top |
| bottom | Bottom |
Typical values
Contact current ratings: 1 A (signal/data) to 125 A (industrial power, IEC 60309); voltage ratings: 50 V to 690 V AC/DC; pin count: 1 to 100+; contact resistance: < 5 mΩ per contact (IEC 60512); insertion force: 5–50 N per contact (size dependent); mating cycles: 500–10,000+ depending on contact plating; ingress protection: IP20 to IP68 (IEC 60309 coloured keying).
Where the Plug Connector Female symbol is used
- Mains socket-outlets (IEC 60083 domestic wall sockets, IEC 60309 industrial sockets) shown in building electrical plans
- PCB connector sockets on circuit board assembly drawings showing female receptacle footprints for mating cable plugs
- Automotive wiring harness diagrams identifying female connector housings on chassis or body harnesses
- Rack-and-panel equipment interconnection drawings showing chassis-side female sockets
- Audio equipment patch bays and stage wiring diagrams showing female XLR and TRS jacks
- Test-bench wiring diagrams showing female banana sockets, BNC receptacles, and SMA jacks on instrument panels
Example
In a panel-mounted power distribution wiring diagram, the Female Socket Connector symbol appears on the front panel of an equipment chassis, with the Top terminal wired to the live bus and the Bottom terminal to neutral; the symbol communicates that a male IEC 60309 blue plug from the supply cable mates here, the recessed live contacts inside the socket are protected from accidental touch when unmated, and the IP44 rating indicates splash protection per the colour-coded keying.
Key facts
- The Plug Connector Female symbol represents the socket, receiving half of a separable connector pair, drawn with an inward-facing (recessed) socket geometry, per IEC 60617 and ANSI Y32.2/IEEE 315-1975.
- The designator for the female socket connector is J (equipment/chassis connector) in ANSI/IEEE 315-1975 convention, or F in IEC connector notation; both are followed by a number (J1, J2).
- In mains power connectors, the live contacts are on the female (socket) side by safety design: the recessed cavity shields energised contacts when the male plug is removed.
- The Plug Connector Female symbol has two standard terminals in the basic schematic representation: Top and Bottom, representing the connector's circuit contacts.
- IEC 60083 governs domestic mains socket-outlets; IEC 60309 governs industrial socket-outlets with colour-coded, keyed housings for voltage and phase identification.
- Contact resistance in a mated connector is specified in IEC 60512 as less than 5 mΩ per contact for new connectors; degraded contacts increase resistance and can cause heating under load.
- Female connectors are described as 'receptacle' or 'socket' in IEC terminology; 'jack' is widely used in audio, RF, and telephony for a panel-mounted female connector, consistent with ANSI J designator usage.
- The inward-facing geometry of the female symbol is visually paired with the outward-pointing geometry of the male symbol; mating pairs are always drawn facing each other on interconnection diagrams.
Frequently asked questions
What does the Plug Connector Female symbol mean in a circuit diagram?
The Plug Connector Female symbol represents the socket or receptacle half of a separable electrical connector. It identifies a fixed or chassis-mounted socket where a mating male plug is inserted to complete the circuit, with recessed contacts that are shielded when the plug is disconnected.
What does the female plug connector symbol look like?
The female connector symbol is a rectangle or block with an inward-facing concave arc, notch, or socket opening on the mating face, representing the recessed socket contacts. Two terminals (Top and Bottom) exit the non-mating end. The inward-facing geometry is the defining visual cue that distinguishes it from the outward-pointing male plug symbol.
What is the difference between the female socket and male plug connector symbols?
The male plug symbol has an outward-pointing (protruding) pin or arc representing pin contacts. The female socket symbol has an inward-facing (recessed) notch or arc representing socket contacts. On an interconnection drawing, the male and female symbols always face each other, with the male pins pointing into the female socket opening.
What is the designator for a female socket connector?
In ANSI/IEEE 315-1975, J designates the chassis- or equipment-side connector (commonly female), numbered J1, J2, etc. In IEC convention, F (female) or the full connector type designation is used. In audio and RF practice, J or 'jack' universally means the panel-mounted female socket.
Which IEC standard governs mains socket-outlets (female receptacles)?
IEC 60083 governs domestic mains socket-outlets for general use; IEC 60309 governs industrial socket-outlets with colour-coded, keyed housings for voltage, phase, and frequency identification. The schematic symbol follows IEC 60617 building-wiring conventions.
Why are live contacts placed in the female (socket) side of mains connectors?
Live contacts are placed in the recessed female socket to prevent accidental contact when the male plug is disconnected. The socket's cavity shields the live contacts so they are not exposed to touch; the male plug's pins are dead until inserted into the energised socket, minimising shock risk during handling.
What is the difference between a socket-outlet and a jack in connector terminology?
A socket-outlet (IEC term) refers to a fixed, panel-mounted mains power female connector. A jack (common in audio and RF) refers to a panel-mounted female connector for signal or low-voltage connections — for example, a 3.5 mm audio jack or a BNC jack. Both are female connectors and share the same inward-facing socket geometry in schematics.
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