What is BS EN IEC 62271‑104 about?
BS EN IEC 62271‑104 discusses about high-voltage switchgear and controlgear. BS EN IEC 62271‑104 is applicable to three-pole alternating current switches for rated voltages higher than 52 kV, having making and breaking current ratings, for indoor and outdoor installations, and for rated frequencies up to and including 60 Hz.
BS EN IEC 62271‑104 is applicable to the operating devices of these switches and to their auxiliary equipment. General purpose switches for this application are designed to comply with the following service applications:
- Carrying rated continuous current, carrying short-circuit currents for a specified time
- Switching of mainly active loads, switching of no-load transformers
- Switching of closed-loop circuits, making short-circuit currents
- Switching of the charging current of unloaded cables, overhead lines or busbars
Who is BS EN IEC 62271‑104 for?
BS EN IEC 62271‑104 on AC switches for high-voltage switchgear and controlgear is useful for:
- Manufacturing of electrical switches for AC
- Retailers and suppliers of Alternating current switches
- Companies dealing with AC switches for high-voltage switchgear and controlgear
- Electrical design engineers 
- Test houses 
Why should you use BS EN IEC 62271‑104?
As the voltage level is high the arcing produced during switching operation is also very high. The high-voltage switchgear deals with the voltage which is above 52KV.
BS EN IEC 62271‑104 helps you manufacture alternating current switches for given voltages and to ensure an efficient electric system and safe usage across applications. 
BS EN IEC 62271‑104 also provides you with additional protective measures to be taken with regards to moisture, corrosive atmosphere, UV radiation, which will help avoid and prevent damage to the alternating current switches. In the event a live circuit becomes hazardous, switching elements can arms operators with functional control to de-energize a part of the system or equipment.  
As a user of BS EN IEC 60947-5-8, you will be able to establish a safe and reliable electric supply system in commercial or industrial facilities of varied sizes. In industries such as robotics and automation that are heavily-dependent on efficient interaction between humans and machine, the alternating current switches can be vital in maintaining an advanced system for businesses. Efficient switching elements such as alternating current switches will help eliminate damage to the equipment or personnel, especially when working in dangerous areas. Overall, adopting the global safety standards defined in BS EN IEC 62271‑104, can instill credibility and acceptance for your business.  
What’s changed since the last update?
BS EN IEC 62271‑104:2020 supersedes BS EN 62271‑104:2015, which is withdrawn. It includes:
- New numbering, following IEC 62271-1:2017
