It adopts an encapsulated coil with explosion-proof level Ex mb II T4 Gb suitable for inclusion IIA, IIB, IIC grade T1*T4 series explosive atmosphere of zone 1, zone situation. The products include TG2521-08EX, TG2531-10EX, TG2541-15EX, TG3522C-08EX, TG3532C-10EX, TG3542C-15EX