Connecting terminals of the transfer switching equipment

The main circuit is connected to 3KC3 and 3KC6 transfer switching equipment by means of box terminals. The box terminals for 3KC3 and 3KC6 transfer switching equipment are identical. The box terminals of the transfer switching equipment have two openings.

Upper opening of box terminal

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Upper opening of box terminal

The upper opening of the box terminal must be used primarily for the main circuit.

Lower opening of box terminal

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Lower opening of box terminal

Accessories are connected to the lower opening of the box terminal. It is not suitable for connecting the main circuit.

The lower opening can be used for the connection of either an auxiliary conductor terminal (3KC9622 - 2) or a bridging bar (3KC9618 – 2: 40 A to 125 A or 3KC9618 – 3: 160 A).

If a bridging bar and an auxiliary conductor terminal are both used simultaneously, the auxiliary conductor terminal must be connected to the upper opening of the box terminal. In this case, the upper opening of the box terminal which is assigned to the auxiliary conductor terminal can no longer be used for connecting the main circuit.