The device has electrical connections (P4-P6) connecting a connection (K4) and common terminals (BN1, BN2) of respective interchangeable modules (M1, M2) to the terminals (BN1, BN2) and a common terminal (BN3) of an interchangeable module (M3), respectively. Electrical connections (P7-P9) connect ground terminals (BT1-BT3) of the respective modules (M1-M3) to the terminals (BT2, BT3) and a connection (K5), respectively. Electrical connections (P1-P3) connect connections (K1-K3) to phase terminals (BL1-BL3) of the respective modules (M1-M3), respectively. The electrical connections are constituted by insulated conductor wires.
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