This system combines fluorescence fiber optic temperature sensors, a multi-channel temperature transmitter, and an LCD display unit into a compact, panel-mountable monitoring solution purpose-built for medium-voltage (MV) and low-voltage (LV) switchgear applications. When installed on switchgear busbars, circuit breaker contacts, or cable connections, they provide accurate, real-time temperature data without any electrical components at the measurement point. Data can be uploaded to monitoring system by local touch screen through RS485 and it can realize real-time monitoring of the whole power distribution system. At the same time, it can monitor real-time temperature at the busway connector and plug-in box interface to ensure safe and reliable operation of the busway. The AP Sensing Linear Heat Detection (LHD) solution consists of a fiber optic sensor cable fitted within the switchgear or attached to the busbar, plus a DTS control instrument that measures a complete temperature profile within seconds. Advanced wireless busbar temperature monitoring system for real-time insights, enhanced safety, and optimized electrical performance in critical infrastructure. Data can be uploaded to monitoring system by local touch screen through RS485 and it can realize real-time monitoring of the whole power distribution system. At the same time, it can monitor real-time temperature at the busway connector and plug-in box interface to ensure safe and reliable operation of the busway. 1. The online monitoring system for fluorescent fiber optic temperature measurement of switchgear, the high-voltage busbar contact temperature measurement system, and the busbar contact components are equipped with temperature sensors. The busway temperature measuring device comprises a shell, a temperature measurement circuit board positioned in the shell and a temperature sensor connected with the temperature. Bus Bars Monitoring: Installing the KLED-TE400 on bus bars allows continuous temperature monitoring, ensuring that electrical systems operate within safe temperature limits. It enables preemptive measures to prevent overheating, reducing the risk of equipment damage or failures. It can monitor the operating temperature of electrical equipment, especially the temperature of easily heated positions such as switchgear contacts, busbars, and electrical contacts.