Pre-wired connectors are factory-assembled cordsets combining a circular connector with a terminated cable, ready to install without field wiring. Used across sensor/actuator networks, fieldbus installations, conveyor systems, and industrial Ethernet infrastructure. Engineers choose them to eliminate wiring errors, reduce commissioning time, and maintain consistent IP protection throughout the installation.
Pre-wired connectors are circular connector assemblies with factory-terminated cable attached — available as single-ended cordsets (connector + flying leads for panel termination) or double-ended cordsets (connectors on both ends for device-to-device connection). The most common sizes are M8 (compact sensors, tight spaces) and M12 (general-purpose sensors, actuators, fieldbus, and industrial Ethernet). Larger formats — M16, M23, and 7/8" — cover higher pin counts and power distribution applications.
M12 connectors use mechanical coding to prevent mismating: A-coded for standard sensor/DC power, B-coded for PROFIBUS, D-coded for Fast Ethernet (100BASE-TX), and X-coded for Gigabit and 10GbE Ethernet. Protocol-specific cordsets are available for PROFIBUS, DeviceNet, CANopen, EtherNet/IP, and PROFINET.
Cable jackets are available in PVC (cost-effective, static installations) and PUR (polyurethane — preferred for drag chains, continuous flex, and oil-exposed environments). Shielded versions are available for EMI-sensitive applications such as servo drives and data networks.
| Size | Typical Pin Count | Common Use | Max Current (typical) |
|---|---|---|---|
| M5 | 2–3 | Miniature sensors | 1 A |
| M8 | 3–5 | Compact sensors, actuators | 1–2 A |
| M12 | 3–12 | Sensors, fieldbus, Ethernet | Up to 4 A |
| M23 | 6–17 | Servo feedback, high pin count | Up to 6 A |
| 7/8" | 3–5 | DeviceNet power distribution | Up to 16 A |
Use M8 where mounting space is tight and current requirements are low (1–2 A). M12 is the better choice for general-purpose wiring, higher current loads, fieldbus, or industrial Ethernet.
The coding key prevents mismatching between incompatible systems. A-coded is for sensor/DC power, D-coded for Fast Ethernet (100BASE-TX), and X-coded for Gigabit and 10GbE Ethernet.
Yes, but you must select cordsets with PUR-jacketed cable rated for continuous flex and verify the minimum bend radius meets your drag chain geometry.
Single-ended cordsets have one connector and flying leads for termination at a terminal block or I/O module. Double-ended cordsets have connectors on both ends for direct device-to-device connection.