I had a similar requirement a while ago when we were looking for a reliable split core current transformer manufacturer for an energy monitoring project. We tested several suppliers, but the main challenge was finding a good balance between measurement accuracy, product consistency, and communication during the customization process.
Eventually, we worked with Yuanxing split core current transformer manufacturer https://yuanxing.net/en/products/split-core-current-transformers/ , and our experience was quite positive. Their split core current transformers showed stable performance, good accuracy, and solid build quality. What I appreciated most was that they were able to provide solutions according to our application requirements instead of offering only standard models.
The installation process was also convenient because the split core design made it easy to install on existing cables without disconnecting the circuit, which saved a lot of time during deployment.