General
Connection type	Screw connection
Mounting method	N busbar
Colour	Silver
Transition resistance	< 1 mΩ

The shield connection terminal SK 14 from Phoenix Contact, manufacturer's number 3025176, is a component for secure and conductive connection of shielded cables to N-busbars in industrial electrical installations. It serves as a transition element between a shielded cable and a busbar, with the shield connection established via a screw connection. The terminal is specifically designed for use in systems with high requirements for electromagnetic compatibility (EMC) to minimize interference in signal or power ranges.

Applications

The SK 14 is used in industrial electrical engineering, particularly in systems with shielded cables, where a reliable and low-ohmic connection to the cable shield and the busbar is required. Typical applications include machine controls, automation systems, enclosures, and installations where electromagnetic interference must be avoided. The terminal is designed for mounting on N-busbars, which typically function as earthing bars or shield connection bars.

Functions and Features in Detail

The shield connection terminal SK 14 features a screw connection type, ensuring a mechanically stable and electrically conductive connection. The shield connection is secured via a screw, creating a firm contact surface with the cable shield. The transition resistance is specified at less than 1 mΩ, ensuring very low electrical impedance and thus efficient conductivity for shield current. The terminal is silver-colored and made of metallic materials suitable for industrial environments.

Technology Explained Simply

The terminal enables a direct and low-ohmic connection between the shield of a cable and an N-busbar. The cable shield is connected to the terminal via the screw connection, which is mounted onto the busbar. This allows shield current to be diverted through the busbar, ensuring effective shielding against electromagnetic interference. The low impedance of the transition (under 1 mΩ) ensures that no significant voltage drops or disturbances occur at the contact point.

Compatibility and Accessories

The SK 14 is designed for mounting on N-busbars. Compatible mounting blocks such as AB-SK-D TOP, AB-SK 65-D, AB-SK 65, AB-SK TOP, AB-SK/E-NS 35, or AB/SS-M are available to secure the terminal on various busbar profiles. Additionally, connection terminals such as AK 4 or AKG 4 GNYE can be combined to create additional connections. Combining with N-busbars such as NLS-CU 3/10 SN 1000MM enables standardized mounting in enclosures.

Mounting and Installation

Mounting is performed by securing the terminal onto an N-busbar, with the exact mounting method depending on the chosen mounting block variant. The shielded cable is connected via the screw connection, and the screw must be tightened securely to ensure a reliable connection. Installation typically takes place in enclosed enclosures or machine cabinets, where the terminal is protected from mechanical stress and environmental influences.

Operational Advantages

The SK 14 provides a reliable and low-ohmic shield connection that meets EMC requirements in industrial systems. The use of a screw connection ensures a mechanically stable connection that remains intact even under vibrations or temperature fluctuations. Compatibility with various mounting blocks and busbars allows flexible integration into existing installations. The low impedance of the transition ensures efficient diversion of shield currents, enhancing signal quality and system safety.