English
Among the circular connector lines offered by Shenzhen REUNION Electronic Co., Ltd. since 2011, the M25 Series Connector occupies the upper end of the metric range for applications that demand high current, large conductor cross-sections, and a robust threaded interface. This series is frequently specified in heavy machinery, multi-axis servo systems, and industrial power distribution where a single connection point must handle substantial electrical load without sacrificing mechanical stability.
The larger thread diameter of the M25 format creates enough internal space for conductors up to 4 mm² or 6 mm², depending on the insert configuration. Continuous current ratings can reach 30 A per power contact under defined ambient conditions, but the actual value depends on contact size, pin count, and wire insulation temperature class. REUNION performs load testing on each new layout to verify contact temperature rise and confirm that the connector remains within safe operating limits during extended duty cycles.
Machinery that combines motor phases, brake circuits, and feedback sensors often needs more positions than smaller metric connectors can provide. The M25 series supports higher pin counts, typically from 6 to 24 positions, allowing designers to allocate larger contacts for power and smaller contacts for control signals within the same insert. This separation follows the same principles used in Power and Signal Connector designs, where creepage distance and shielding are managed to prevent interference between high-current and low-level circuits.
The screw coupling on the M25 connector distributes retention force across a wide thread surface, which helps maintain contact alignment under heavy vibration and mechanical shock. Panel-mount receptacles can be installed with front or rear mounting, and cable plugs are available in straight or angled versions. For equipment exposed to moisture, dust, or high-pressure washdown, sealed variants with O-rings and cable glands achieve IP67 or IP68 ratings. Detailed information on ingress protection is available in the Waterproof Connector category.
The Shenzhen manufacturing site covers approximately 4,000 square meters, houses 10 production lines, and employs about 150 people. Monthly capacity is near 100,000 connector sets. The engineering team, supported by 13 patents and 2 software copyrights, completes over 30 custom projects each year. For M25 applications, common requests include non-standard pin assignments, custom keying, shielded housings, and overmolded cable exits. Finished Cable Assembly units are prepared in-house, including wire cutting, termination, and electrical testing before shipment.
REUNION operates under ISO 9001 and ISO 14001 quality and environmental management systems, with ISO 13485 applied to medical-related products. Compliance with UL, CB, and CQC standards is evaluated where applicable. Each production batch is tracked through the ERP system, linking raw material certificates, assembly parameters, and final test records into a traceable chain for customers who require documented reliability.
The M25 provides a larger contact cavity than the M20, allowing thicker conductors and higher continuous current ratings. It also offers more space for additional pins or hybrid layouts. The trade-off is a larger panel cutout and coupling diameter, so the choice depends on available mounting space and the required conductor cross-section.
Yes. Overmolded cable entries eliminate a potential ingress point and provide strain relief. REUNION builds complete sealed assemblies with customer-specified cable length, wire gauge, and jacket material, then tests each unit for continuity, insulation resistance, and ingress protection before dispatch.
Yes. The insert can be arranged with larger power contacts for the three phases and smaller signal contacts for control or feedback lines. REUNION validates the layout for dielectric strength, current-carrying capacity, and crosstalk to ensure both circuit types function reliably in the same housing.
