Plug Connector Male Symbol
Definition: The Plug Connector Male symbol represents a pin-type electrical connector — commonly called a plug — used in wiring and schematic diagrams to denote the cable-end or equipment-side connector half whose protruding pin contacts insert into the socket contacts of a mating female connector (receptacle), as defined by IEC 60617 connector symbol conventions and ANSI Y32.2 / IEEE 315-1975; the designator is P or J (plug/jack convention varies by standard).
Also known as: male connector, plug connector, pin connector, male plug, cable-end plug, prong connector, male pin header, plug (IEC), plug half, connector plug.
What the Plug Connector Male symbol means
The Plug Connector Male symbol denotes the inserting half of a two-part separable connector pair. The male connector carries protruding pin contacts that engage with the recessed socket contacts of the corresponding female connector (receptacle). In power connectors, the male plug is typically the cable-end or portable-equipment half; the female receptacle is the fixed, panel-mounted half. This assignment is a deliberate safety convention: the live contacts are recessed in the female side so they are not exposed when the male plug is disconnected.
In wiring and schematic diagrams, the Plug Connector Male symbol identifies a separable connection point that can be disconnected and reconnected without tools. Its two terminals (Top and Bottom) represent the connector's circuit contact positions. The symbol communicates that the wired circuit at this point is not a permanent joint but a field-separable interface designed for maintenance access, equipment swap-out, or cable interchangeability.
How to identify the Plug Connector Male symbol
The Plug Connector Male symbol is typically drawn as a rectangle or block with an outward-pointing element — often a protruding line, pin, or outward-facing arc on the mating face — representing the pin contacts that insert into the female. Two terminals labelled Top and Bottom exit from the non-mating end. IEC 60617 uses a half-circle or arrow-tip pointing outward on the mating side, with a bar behind to indicate the connector body. The male symbol always has the projecting contact geometry, which distinguishes it from the female symbol's inward-facing (recessed) socket geometry.
Function in a circuit
The Male Plug Connector provides a mechanically and electrically secure, field-separable connection between a cable and an equipment chassis, panel, or PCB. When mated with its female counterpart, the pin contacts make low-resistance electrical joints that carry power, signals, or data. When unmated, the male plug leaves no exposed live contacts on the cable end — a safety design that is standard practice in IEC and NEC wiring conventions for mains power connectors.
Standards: IEC vs ANSI
| IEC 60617 | IEC 60617 defines the male plug connector symbol as a half-circle or outward-pointing contact symbol on the mating face, per IEC 60617-08 (measuring instruments and signal processing). The product standard for mains plugs is IEC 60083 (plugs and socket-outlets for domestic use). IEC 60309 governs industrial plugs. The male connector is designated P (plug) in IEC convention. |
|---|---|
| ANSI/IEEE 315 | ANSI Y32.2 / IEEE 315-1975 uses a rectangle with outward-pointing pins on the mating edge for the male plug connector. In ANSI convention, connectors may be designated P (plug, cable side) or J (jack, equipment/chassis side), with the assignment sometimes reversed for signal connectors — a source of common labelling confusion. |
| Key difference | IEC and ANSI symbols use the same outward-pointing pin geometry for the male connector. The main difference is in designator convention: IEC uses P for the male plug; ANSI/IEEE uses P for the cable-side connector regardless of sex, and J for the chassis-side connector — which can be male or female depending on the connector family. |
Terminals / pins
| Pin | Name |
|---|---|
| top | Top |
| bottom | Bottom |
Typical values
Contact current ratings: 1 A (signal/data connectors) to 125 A (industrial power connectors); voltage ratings: 50 V to 690 V AC/DC; pin count: 1 to 100+ (typical multi-pin); contact resistance: < 5 mΩ (per IEC 60512); mating cycles: 500–10,000+ depending on contact plating; ingress protection: IP20 (unprotected) to IP68 (submersible, IEC 60309).
Where the Plug Connector Male symbol is used
- Mains power plugs (IEC 60083 domestic, IEC 60309 industrial) shown on appliance wiring diagrams
- PCB connector headers on circuit board assembly drawings showing male pin-header footprints
- Automotive wiring harness diagrams identifying male connector bodies on cable assemblies
- Rack-and-panel wiring diagrams in avionics and telecommunications equipment
- Signal and data interface schematics (USB, XLR, RJ45 plug representations) in equipment interconnection drawings
- Motor control centre wiring diagrams showing male plug-in connections for withdrawable motor starter units
Example
In a laboratory instrument power wiring diagram, the Male Plug Connector symbol appears at the cable end of the instrument's supply lead, with the Top terminal connected to the line (live) conductor and the Bottom terminal to the neutral conductor; the symbol communicates that this IEC 60083 male plug connects to the matching female panel receptacle on the instrument chassis, and that the pin contacts are exposed only while the connector is un-mated from the energised receptacle.
Key facts
- The Plug Connector Male symbol represents the inserting, pin-contact half of a separable connector pair; it uses an outward-pointing pin or arc on the mating face, per IEC 60617 and ANSI Y32.2/IEEE 315-1975.
- The designator for a plug connector is P (plug) in IEC convention and P or J (depending on cable vs. chassis mounting) in ANSI/IEEE convention under IEEE 315-1975.
- In mains power connectors, the male plug carries the live contacts on the cable end by safety design convention: the female receptacle (panel side) has recessed live contacts so they are not exposed when the plug is removed.
- The Plug Connector Male symbol has two standard terminals in the basic schematic representation: Top and Bottom, representing the connector's circuit contacts.
- IEC 60083 governs domestic mains plugs and socket-outlets; IEC 60309 governs industrial plugs for voltages up to 1000 V AC and currents up to 125 A.
- Male connectors are described as 'P' (plug) in IEC terminology; 'jack' can refer to a panel-mounted female or — in audio/RF practice — to a panel-mounted socket that receives a plug, causing occasional labelling ambiguity.
- Contact resistance in a properly mated connector is specified in IEC 60512 as less than 5 mΩ per contact; higher contact resistance indicates contamination, corrosion, or worn contacts.
- Male connector symbols are always drawn with the outward-pointing (protrusion) geometry; female connector symbols use the inward-facing (socket/recess) geometry — this visual distinction is consistent across IEC and ANSI standards.
Diagrams that use this symbol
- 4 prong trailer wiring diagram
- electrical plug wiring diagram
- wiring a 3 pin plug
- 3 pin plug wiring diagram
- 30 amp rv plug wiring diagram
- 3 phase plug wiring diagram
- extension cord wiring diagram
- rv wiring diagram
Frequently asked questions
What does the Plug Connector Male symbol mean in a circuit diagram?
The Plug Connector Male symbol represents the pin-contact, inserting half of a separable electrical connector. It identifies a point in the circuit where a cable-end or equipment plug makes a detachable connection to a mating female receptacle, allowing the circuit to be disconnected without cutting wires.
What does the male plug connector symbol look like?
The male plug connector symbol is a rectangle or block with an outward-pointing pin, arrow-tip, or protruding arc on the mating face, representing the pin contacts that insert into the female socket. Two terminals (Top and Bottom) exit the non-mating end. The outward projection is the defining visual cue that distinguishes the male symbol from the female socket symbol.
What is the difference between the male plug and female plug connector symbols?
The male plug symbol has an outward-pointing (protruding) element on the mating face representing pin contacts. The female plug symbol has an inward-facing (recessed) element representing socket contacts. When drawn as a mating pair on a schematic, the male arrow-tip faces the female socket opening.
What is the designator for a male plug connector?
In IEC convention, the male plug connector is designated P (plug). In ANSI/IEEE 315-1975, P designates the cable-side connector and J the chassis-side connector, regardless of sex. The number suffix (P1, P2, J1) distinguishes multiple connectors on the same schematic.
Which IEC standard governs mains plug connectors?
IEC 60083 governs domestic mains plugs and socket-outlets for general use; IEC 60309 governs industrial plugs and socket-outlets for currents up to 125 A and voltages up to 1000 V. For the schematic symbol, IEC 60617 (building wiring conventions) applies.
Why is the live contact usually on the female (socket) side in mains power connectors?
The live contacts are placed on the female (recessed socket) side so that when the male plug is disconnected and exposed, there are no protruding live pins that could be accidentally touched. The male plug's pins are dead until inserted into the energised female socket, reducing the risk of contact with live parts during handling.
What standard defines the plug connector symbol in schematics?
IEC 60617 defines connector symbols for schematics using the half-circle and pin conventions. ANSI Y32.2/IEEE 315-1975 uses the labelled rectangle with outward-pointing pin geometry. Both standards use the same outward-versus-inward visual convention to distinguish male from female connectors.
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