Rail-mounted energy meters feature a modular design, specifically engineered to address the issues of bulkiness and installation inconvenience associated with traditional wall-mounted meters. Their design adheres to standardized industrial installation norms, thereby meeting the demands of terminal power distribution systems for space efficiency, ease of installation, and flexible scalability.
These rail-mounted meters utilize a 35mm DIN rail mounting structure compliant with the IEC 60715 standard. Their external widths are typically multiples of 18mm, 36mm, or 72mm-corresponding to 1P, 2P, and 4P specifications, respectively-facilitating high-density arrangement within distribution boxes and thereby conserving installation space. Installation requires no screws; units can be directly clipped onto the rail, with the installation time for a single meter taking less than 30 seconds. Furthermore, they support hot-swapping for replacement, thereby simplifying both installation and maintenance procedures [6]. Certain newer models feature improved locking mechanisms that utilize a combination of inclined planes and springs to reduce the required actuation force, effectively resolving the difficulty of applying sufficient force during installation and removal in confined spaces.
The compact structure and small physical footprint of rail-mounted energy meters impose rigorous demands on both R&D design and manufacturing processes. Several products have already been granted design patents, with the core focus of their patented designs centering on their external form.
Rail-mounted energy meters are available in a wide variety of types, primarily including single-phase and three-phase models, as well as standard, communication-enabled, multi-functional, smart, and prepaid variants. Additionally, specialized DC rail-mounted meters are available to cater to the new energy sector. These diverse products are capable of meeting the sophisticated energy management requirements of various settings, such as commercial buildings, industrial parks, long-term rental apartments, and photovoltaic energy storage systems.