High Voltage Center Break Disconnector 3DN1 72.5 kV up to 550 kV Since the 1930s, Siemens has exported disconnectors and related components throughout the world. Based on the “genetic code” of the proven Siemens disconnectors, the portfolio has now been enhanced and harmonized to respond even better to varied customer needs and make it easier for you to select the right product. All Siemens disconnectors are delivered pre-adjusted and are therefore easy to assemble on site. You will benefit from reduced setup time and cost. Center break disconnector 3DN1 Application and design of the disconnector The center break is the most frequently used disconnector type worldwide. Its design is characterized by two rotatable insulators mounted on the switch base. The current path opening to the side creates a bigger phase distance than with other disconnector types. Thanks to its convenient design, the center break is particularly versatile and can be applied in parallel, diagonal or in-line arrangements. Disconnectors designed for your needs. Customer-specific solutions The 3DN1 is available in a broad voltage range from 72.5 to 550 kV. Thanks to its modular design it can be easily customized to fulfill any special customer or market requirements. The base frame can be flexibly adapted to your supporting structure which allows for easy set-up and commissioning, saving time and labor costs. Moreover, various colors are possible. Proven quality that serves you a lifetime Thanks to a sophisticated contact system with its high quality coating, the 3DN1 has a particularly long service life and requires zero maintenance effort. Extended RIV limits for each voltage level reduce magnetic interference and thereby contribute to increased efficiency and extreme reliability. Of course, our center break disconnectors fulfill all requirements of different international and national standards like IEC, GOST R and GB, and are proven in extensive type tests. Long-term partnership Siemens is not just a supplier of high voltage products, but a long-term, reliable partner. Decades of experience and our presence in more than 190 countries worldwide ensure our competence and global availability. Knowing your business, we can provide the best technical solutions for any special requirements and support you in finding the ideal product type, configuration, and accessories

Technical structure The total weight of our new center break disconnector has been reduced considerably through the use of fewer steel parts, especially in the base frame, thus reducing installation effort and transport costs. At the same time, our 3DN1 is capable of withstanding very high terminal and mechanical loads and has supreme seismic capabilities. Corrosion-free components, such as hot-dip galvanized steel parts, ensure a particularly long service life. The 3DN1 is designed for ambient temperature limits from -55 up to +55°C and has a high short-circuit capability, and excellent ice...