Servo Connectors in 2026: Why M23/M40 Hybrid Is the New Baseline

Servo motors live at the harsh edge of automation—high vibration, continuous flex, encoder feedback screaming at high frequency, and drives demanding tighter EMI control. The servo motor connector that used to mean “a separate power plug + a signal plug” is now rapidly becoming a single hybrid circular connector.

M23 and M40 Take the Lead

For compact drives and robotic joints, the M23 circular connector remains the workhorse: 6–9 pin power inserts up to 30 A / 630 V, 12–19 pin signal inserts for encoder and resolver feedback, all in an IP67 metal shell with 360° shielding.

When current climbs—decentralized servo drives, AGVs, heavy axes—the M40 hybrid connector steps in, pushing 75 A and folding Cat5/Quadrax Ethernet pairs into the same body for EtherCAT and Industrial Ethernet.

One Cable Automation (OCT)

The 2026 trend is clear: power + signal + data in one connector. Instead of running three cables from cabinet to motor, a hybrid M23/M40 carries 3-phase power, brake, encoder, and 100 Mbit EtherCAT over a single drag-chain-rated cable. Fewer failure points, less weight, faster commissioning.

What Engineers Should Check

- Locking: threaded M23 for vibration zones; bayonet/Checkmate-style for fast service
- Shielding: 360° metal-shell termination, not just foil wrap
- Coding: M12 A/B/D/X + M23 hybrid coding to avoid cross-mating
- Standard: IEC 61984 / IEC 61076-2-118 for multi-vendor interoperability
- Rating: IP67 minimum on machine frame, IP69K for washdown

The takeaway: if you are specifying a servo drive connector today and still separating power and feedback into two interfaces, you are leaving cable cost, EMC margin, and cabinet space on the table. Hybrid M23/M40 is no longer premium—it is the new default.