The P632 Transformer Differential Protection Device must be connected in accordance with the terminal connection diagram as indicated on the type identification label. The relevant terminal connection diagrams that apply to the P632 are to be found either in the supporting documents supplied with the device, or in Chapter “Location and Connection Diagrams”.

In general copper conductors with a cross section of 2.5 mm² (US: AWG12) are sufficient to connect a system current transformer to a current input on the P632. To reduce CT knee-point voltage requirements, it may be necessary to install shorter copper conductors with a greater cross section between the system current transformers and the current inputs on the P632. Copper conductors having a cross section of 1.5 mm² (US: AWG14) are adequate to connect binary signal inputs, the output relays and the power supply input.

All connections run into the system must always have a defined potential. Connections that are pre-wired but not used should preferably be grounded when binary inputs and output relays are isolated. When binary inputs and output relays are connected to common potential, the pre-wired but unused connections should be connected to the common potential of the grouped connections.