Wago din rail terminal blocks spring cage 52mm 16a wago 2002 1874 the wago din rail disconnecting terminal block spring cage 52mm 16a blue is a 4 conductor isolating and test terminal with testing facility the cage clampreg connection technique allows stripped solid and ferruled conductors to be pushed in with their space saving design these terminal blocks are up to 30 smaller than standard terminal block and with a conductor entry angle of less than 15deg allowing easier install