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NAL/NALF – Mounting and operation manual 5

4.0 Mounting the mechanism on the switch. Fig. 4

The mechanisms are mounted on the right hand side of the

switch main frame and the switch is normally operated from the

same side (mechanism-side). When the switches have to be

operated from the opposite side, an operating shaft must be con-

nected, see Fig. 6. The mechanism clutch is brought together with

the clutch of the hollow main shaft and the mechanism is ﬁxed to

the switch frame.

Note: Contact knives in open position

Normally the switch disconnector is delivered without shaft exten-

sion for left hand side operation.

4.1. Test operation of A-mechanism

After having mounted the mechanism to the switch frame, check

that the latch H is in correct position by pulling it back to the

outermost position, see Fig. 5.

Test operation see item 2.1.

Fig. 4

Fig. 6

Fig. 5

Fig. 4 Mounting the mechanism on the switch | Fig. 5 Shunt trip mounted on the A-mechanism | Fig. 6 Shaft extension for the

left-hand side operation

ABB NAL Series Mounting And Operation Manual

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