TB series terminal blocks can work in 150°C temperature ALL TIME. The surroundings temperature -40°C---200°C Rated Voltage: 600V, Rated Current: 15A/25A TB-1503(15A,3P),TB-1504(15A,4P),TB-1506(15A,6P),TB-1512(15A,12P);TB- 2503(25A,3P),TB-2504(25A,4P),TB-2506(25A,6P),TB-2512(25A,12P)