Figure 5: P153 rear view-terminal connection 
2.3.3  Terminal Blocks 
2.3.3.1  CT connections 
P153 devices use terminal blocks as shown below. The terminal block consists of up to 12 x M3.5 
screw terminals for CT connections. The CT wires should be terminated with 90° L-shape ring lugs, 
with no more than two lugs per terminal. 
 
Figure 6: CT terminal block 
 
Caution:    Always fit an insulating sleeve over the ring terminal. 
2.3.3.2  Input / Output connections 
The terminal block consists of up to 18 x M3 pin terminals used for input/output connections. These 
should be wired with 1.5 mm
2
 PVC insulated multi-stranded copper wire. 
 
Figure 7: Status and output contact terminal block