Miniature current transformers are characterized by their small size and light weight, making them easy to integrate into circuit boards or space-constrained precision distribution cabinets, smart meters, and other equipment. Their accuracy classes can reach 0.1, 0.2, or 0.5, meeting the needs of high-precision energy metering and monitoring. Miniature current transformers provide electrical isolation between the primary and secondary sides to protect measuring equipment and personnel. They also feature wide frequency response and fast response speed, making them suitable for measuring rapidly changing current/voltage signals. Their low power consumption makes them suitable for applications requiring long-term online monitoring. Some products are designed with ease of installation and maintenance in mind, for example, by using a rotatable protective cover to improve wiring convenience. The industry is moving towards miniaturization and integration, high precision and high reliability, low power consumption and long lifespan, intelligentization and data analysis, and wireless and remote monitoring.
The main parameters of a miniature instrument transformer include its accuracy class (such as 0.1, 0.2, 0.5, 1, etc.), turns ratio (the rated transformation ratio of primary and secondary current or voltage), and rated primary current or voltage. Key parameters also include rated load (the maximum load impedance or power that can be connected to the secondary side), frequency response (the normal operating frequency range that ensures accuracy), and isolation withstand voltage (the insulation voltage level that the primary and secondary sides, as well as the winding to ground, can withstand).