JN17-12/50 indoor high voltage AC grounding switch for 12kV power system protection.

JN17-12/50 Indoor High Voltage AC Earthing Switch – 12kV Grounding Isolating Switch with Fast Closing Mechanism for 3-12kV Power Systems

The JN17-12/50 is an advanced indoor high-voltage earthing switch engineered for 3~12kV three-phase AC 50Hz power systems. Fully compliant with GB1985 and IEC129 standards, this switch provides essential safety protection during the overhaul of high-voltage electrical equipment. It features a robust short-circuit making capacity to prevent damage to other electrical assets in fault conditions. Designed with high-strength insulators and a rapid-closing spring mechanism, the switch ensures consistent contact performance independent of manual operating speed.

JN17-12/50 Indoor High Voltage AC Earthing Switch (12kV)

Product Overview

The JN17-12/50 is an advanced indoor high-voltage ground switch designed for 3~12kV power systems operating at three-phase AC 50Hz. Fully compliant with GB1985 and IEC129 standards, this switch is a critical safety component used with various types of high-voltage switchgear. It plays a vital protective role during the overhaul of high-voltage electrical equipment by providing a reliable grounding path and possessing a robust short-circuit making capacity to prevent damage to other electrical assets.

Core Features & Technical Advantages

Premium Material Construction: The switch utilizes high-strength resin insulators and features live parts made of 99.9% silver-plated electrolytic copper for maximum conductivity.
High-Performance Contact System: Contact elements are over-dimensioned to guarantee high contact pressure between blades and contacts, resulting in reduced ohmic resistance and minimal metal wear-off over the life of the switch.
Rapid Closing Mechanism: Features a pressure spring energy storage system that ensures a closing speed completely independent of manual operation speed, providing rapid and consistent contact engagement.
Robust Stability: Specifically designed to withstand significant thermal and mechanical stresses encountered under severe short-circuit conditions.
Intuitive Safety Indication: Equipped with a clear mechanical indicator (Green “O”) for immediate visual verification of the switch position.
Reliable Mechanical Life: Designed for long-term industrial durability with a mechanical endurance of 2,000 cycles.

Technical Specifications

Item	Unit	Data
Rated Voltage	kV	12
Rated Short-time Withstand Current	kA	50
Rated Short-circuit Duration	s	4
Rated Short-circuit Making Current	kA	100
Rated Peak Withstand Current	kA	100
PF Withstand Voltage (1 min) – Earth	kV	42
Lightning Impulse Withstand Voltage	kV	75

Standard Working Conditions

To ensure stable performance and safety, the following environmental requirements must be met:

Altitude: Not exceeding 1,000 meters above sea level.
Ambient Temperature: Operational range from 12°C to +40°C (with -25°C allowed in heavy cold zones).
Relative Humidity: Daily average $\le$ 95%; monthly average $\le$ 80%.
Site Restrictions: Must be free of conductive dust, corrosive gases, explosive substances, and severe vibrations or impacts.

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