CMC 310 is a compact and lightweight relay test set optimized for field testing in distribution substations and industrial facilities. Despite its small size, it delivers high-precision current and voltage outputs suitable for a full range of protection relays. The device integrates seamlessly with OMICRON’s Test Universe software, supporting automated test plans, fault simulation, and report generation. CMC 310 provides stable performance even under dynamic load conditions, ensuring reliable verification of relay functions such as overcurrent, earth-fault, and directional protection. Its portability makes it ideal for routine maintenance, commissioning, and rapid troubleshooting. The device also supports optional IEC 61850 testing for digital substations.