HN Coaxial Connector

The HN (High Voltage N) coaxial connector is a heavy-duty, 50Ω RF interface engineered for ultra-high voltage applications exceeding SHV capabilities. Defined by MIL-C-39012/16 and IEC 60370, it features an extended threaded coupling mechanism and significantly increased creepage/clearance distances compared to standard N-type or SHV connectors. Designed for continuous operation up to 15 kV RMS (sea level), the HN provides robust environmental sealing, superior mechanical strength, and reliable arc suppression in demanding industrial, scientific, and defense high-voltage systems where safety margins are non-negotiable.

Key Technical Specifications

Critical Derating Note: Voltage ratings decrease with altitude. At 70,000 ft, max working voltage derates to ~5 kV RMS per Paschen’s Law. Always consult manufacturer altitude-voltage curves for aerospace/vacuum applications.

Primary Applications

• High-Energy Physics: Accelerator klystron/magnetron HV feeds, beam dump bias lines, synchrotron RF cavity couplers.
• Medical & Industrial Radiography: High-power X-ray generator outputs (>100 kW), linear accelerator (LINAC) gun supplies, cargo inspection systems.
• Power Grid & HVDC Testing: Transformer partial discharge monitoring, GIS switchgear diagnostics, cable fault location equipment.
• Semiconductor & Plasma Processing: High-power sputtering/PECVD electrode feeds, ion source extraction supplies, E-beam evaporation HV lines.
• Defense & Radar Systems: High-power TWT/CFPA amplifier bias, directed energy weapon modulators, EMP simulator pulse forming networks.
• Capacitor & Surge Arrestor Manufacturing: Hi-pot production testing fixtures, impulse voltage generator connections, dielectric withstand validation setups.

Safety & Handling Warnings

• Never mate/unmate under load. HN connectors lack hot-plug safety interlocks. Always de-energize and verify zero voltage before handling.
• Torque control is mandatory. Over-torquing cracks ceramic/PTFE dielectrics; under-torquing causes arcing at threads. Use calibrated torque wrench (typically 15–20 in-lbs).
• Inspect thread integrity. Cross-threading or galling compromises shielding and voltage rating. Reject connectors with damaged threads immediately.
• Use only matched HN-to-HN interfaces. Adapters to N/SHV reduce voltage rating to lowest component spec. Verify adapter certification for target voltage.
• Grounding verification required. Confirm chassis ground continuity before energizing. Floating grounds cause catastrophic insulation failure.