Fuse Link selection
• Select a rating of fuse link which is at least equal to the normal full load current of the circuit, including any allowances needed for harmonic currents, as in the case p.f. correction circuits.
• Ensure that the fuse link rating can withstand any over currents which may apply to the circuit, such as transformer in-rush currents, motor starting surges and repetitive cycle loads.
• When full cable protection is required, ensure that the fuse link rating is compatible with the selected cable, i.e. less than or equal to cable rating.
Recommended minimum torque values
Rating |
Fuse Link fixing screw | Cable terminal screw | Back connected stud | |||
Size | Torque | Size | Torque | Size | Torque | |
SC20 | N/A | N/A | M6 grub screw | 2,0Nm | M6 | 3,0Nm |
(Slotted) | (18 lb.in) | (27 lb.in) | ||||
SC32 | N/A | N/A | M6 grub screw | 2,0Nm | M6 | 3,0Nm |
(Slotted) | (18 lb.in) | (27 lb.in) | ||||
SC63 | N/A | N/A | M8 grub screw | 3,0Nm | M8 | 6,0Nm |
(Slotted) | (27 lb.in) | (53 lb.in) | ||||
SC100 | M6 | 2,5Nm | 3/8” grub screw | 3,5Nm | N/A | N/A |
Pan head | (22 lb.in) | (Slotted) | (31 lb.in) | |||
SC125 | N/A | N/A | M12 grub screw | 4,0Nm | N/A | N/A |
(Slotted) | (35 lb.in) | |||||
Note: | Conversion from Nm to lb.in. | 1Nm = 8,85075 lb.in. |
(From Red Spot catalogue.)