Ex PI-EX-TB - Ex base terminal block for intrinsically safe signals with knife disconnection and test connections Ex PI-EX-TB/T - Ex-basic terminal block, with knife disconnection and integrated temperature measurement of the input terminal blocks for cold point compensation Ex TT-PI-EX-TB/T - Intrinsically safe basic terminal block with isolating connector, test connections and surge protection, with additional temperature measurement of the input terminal block for cold junction compensation, for mounting on NS 35/7.5 Ex TT-PI-EX-TB - Intrinsically safe basic terminal block with isolating connector, test connections and surge protection, for mounting on NS 35/7.5