Motorized disconnect switch 3DN2

high-voltagethree-phasevertical

Overview Siemens Energy high-voltage disconnectors and earthing switches provide visible isolation and absolute de-energization for substation and transmission applications. The product range covers multiple construction types designed for indoor and outdoor use in demanding environments.

Production of disconnector and earthing switch technology Manufacturing follows optimized processes and certified quality management. A global production network shortens delivery times and reduces transport-related emissions while maintaining consistent technical standards and documentation.

Main features

• Voltage range: 36 kV to 800 kV (product range); additional technical references up to 1200 kV
• Rated current: up to 5000 A
• Rated short-circuit current: up to 80 kA (maximum values; verification required per application)
• Materials and designs suitable for high seismic loads
• Designed for indoor and outdoor installations, including coastal and saline environments
• Switching-capacity and coupling requirements addressed, including values beyond IEC when specified

Advantages

• Maintenance-free contact systems in classic designs (no spring elements)
• Optimized total cost of ownership through pre-adjusted, routine-tested assemblies
• Operational performance under severe climatic conditions (temperature extremes, icing, coastal zones)
• Type-tested according to IEC 62271-102
• Quality management certified to DIN EN ISO 9001
• Delivery of pre-adjusted assemblies to simplify erection and commissioning
• Long-term technical support and service on short notice

Disconnectors and earthing switch variations The offering includes construction types adapted to installation constraints and busbar layouts:

• 3DN1 center-break disconnectors — two rotating insulators, sideways opening motion, flexible for parallel/diagonal/in-line arrangements, integrated base frame, extended RIV limits, tested to national and international standards
• 3DN2 double-side-break disconnectors — three support insulators with a rotating center insulator carrying the current path; compact and stable design, two open separation sections, optional self-interlocking, compatible with surge arresters
• 3DN3 pantograph disconnectors — minimal mounting footprint, scissors-type busbar connection, diagonal or parallel arrangements, optional self-interlocking, robust for high mechanical and thermal loads
• 3DN4 vertical-break disconnectors — vertical opening for small phase distances, combined vertical swing and rotary movement, large distance between support and rotating insulators for saline-fog resistance, delivered as finished assemblies
• Freestanding and built-on earthing switch options for visible isolation and absolute de-energization

Modular design All construction types share common basic components and largely identical interfaces (except where noted):

• Current path
• Contact system (not present in pantographs)
• Supporting insulator
• Rotating insulator
• Base frame
• Connecting rods (except for center-break designs)
• Drive

Contact systems Contact system characteristics and field-proven behavior:

• Contact force increases under short-circuit conditions
• High dynamic and thermal stability under leakage-current conditions
• Optimized for silver-plated contact applications
• Lubrication-free solutions available
• Designed for long-term maintenance-free operation
• Proven field experience exceeding 40 years
• Concepts largely based on RUHRTAL heritage designs

Drive systems Drive units are delivered as finished, pre-adjusted assemblies to simplify installation and commissioning. Typical features include stainless-steel housings (IP54), IEC-tested auxiliary switches, anti-condensation heaters and optional compatibility with switch bases. Notable units:

• 3DV8 motor drive — integrated motor and gearbox with auxiliary switch; maintenance-free transmission, secure operation and low noise
• 3DV4 manual drive — lockable hand lever for safe maintenance and service
• 3DV1 control unit — centralizes and collects signals for single-pole or multipole operating mechanisms

Power transmission system Reference projects illustrate the use of disconnectors and earthing switches as key components in AIS and GIS substations and HV transmission infrastructure.

Purpose and applications Disconnectors provide visible gap isolation for safe working on high-voltage networks; earthing switches ensure absolute de-energization of HV components. Typical applications: substations, AIS/GIS installations and transmission networks requiring visible isolation and personnel safety.

Caractéristiques / spécifications techniques

• Voltage references: 36 kV to 800 kV (product range); technical overviews reference up to 1200 kV
• Rated current: up to 5000 A
• Rated short-circuit current: up to 80 kA (maximum values; application verification required)
• Ambient temperature range: -60 °C to +55 °C (reference)
• Type-tested according to IEC 62271-102; tested to national/international standards (IEC, ANSI, GOST R, GB)
• Quality management: certified to DIN EN ISO 9001
• Construction types: center-break, double-side-break, pantograph, vertical-break, freestanding and built-on earthing switches
• Mechanical features: compact and stable designs, high mechanical tensile load capacity, optional self-interlocking for short-circuit safety
• Environmental robustness: designed for coastal/saline environments, extreme temperatures, icing and seismic zones
• Contact system features: maintenance-free, lubrication-free options, optimized for silver plating, increased contact force under fault conditions
• Delivery: routine-tested, pre-adjusted assembly groups to reduce erection and commissioning time