Selecting the right cable plug connector is critical in medium voltage systems. Whether for switchgear, transformers, or RMUs, an improperly matched plug connector can lead to insulation failure, installation issues, or costly downtime. Among the most searched topics by engineers and procurement teams, product selection stands out as the key decision point—impacting system compatibility, safety, and total cost of ownership.
Here is a practical guide to help you choose the correct cable plug connector based on actual application needs:
☆ Voltage and Current Ratings
Always begin by confirming the system voltage level (e.g., 12kV, 24kV, 33kV) and the continuous current requirement. Select a plug connector rated for slightly above your operating values to provide a margin for system stability and safety.
☆ Interface Type and Standards
Pay close attention to interface standards such as EN50180/EN50181 (Type C, Type A), which dictate mechanical compatibility with bushings. Mismatched interfaces can lead to poor contact or insulation failure. For RMUs and compact switchgear, elbow-type or straight-type connectors are commonly used.
☆ Insulation Material
Most medium voltage plug connectors are made from EPDM or silicone rubber. Choose EPDM for higher mechanical durability and silicone rubber for better hydrophobic properties in outdoor environments.
☆ Screened vs. Unscreened
For confined installations or where touch safety is required, opt for fully screened connectors. These improve personnel safety and reduce electromagnetic interference during operation.
☆ Ease of Installation and Maintenance
Select connectors that support cold shrink or plug-in mechanisms with clear torque limits, reducing on-site installation risks. Some manufacturers offer field-tested kits that include all needed accessories.
Choosing the right connector not only ensures safe power transmission but also helps avoid unnecessary procurement costs from product mismatch or rework.
At Putai, we offer a full range of medium voltage cable plug connectors from 12kV to 35kV, covering elbow and straight types, fully screened and unscreened models, with proven compatibility to EN standard bushings. Our products are widely used in switchgear, transformers, and compact substations—trusted by global OEMs for their reliability, material quality, and stable supply.
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