NAL/NALF – Mounting and operation manual 29
19.0 Technical specification for NAL/NALF switch disconnectors NAL 12 – 17.5 – 24 – 36/6 – 12.5 A – K
Main functions
Item Function Mechanism type
Function limits Reference control
12 kV 17.5/24 kV 36 kV
01 Closing speed of contact knifes m/sec 5.5 – 5.8 6.5 – 6.8 4.7 – 6.3
Verified by manufacturer
02 Opening speed of contact knifes m/sec 4.5 – 4.8 5.5 – 5.8 5 – 7
03 Maximum operating torque
Type K
Closing [Nm]
Opening [Nm]
70 90 100
Verified by manufacturer
80 100 120
Type A
Closing [Nm]
Opening [Nm]
90 110 120
5 5 5
04
Minimum distance between fixed contact
and contact knife of open switch
120 mm 212 mm 360 mm Verified by manufacturer
05 Contact knife penetration Both contact spots on each side
Control 100% by sight06 Contact knife penetration MUST make contact.
07 Contact knife alignment Contact area = 26 mm
Tolerance of contact engagement 2-5 mm
(see fig. 16)
Control 100% by sight
The alignment is controlled by:
the main contact knife which must be
aligned with the main contact.
Control 100% by sight
The arcing knife runs straight and moves freely
in the arcing chamber, and makes full
engagement with the fixed arcing contact.
Must be adjusted
Item ref. 05 – 06 – 07
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