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DropOut Fuse Cutout

The drop out fuse cutout is a type of outdoor high voltage protective device. It is installed in the high voltage side of the distribution transformer or in the distribution line for overload and short circuit protection.

Our drop out fuse cutout consists of insulating support and fuse tube. The fuse tube is composed of the inner arc suppression tube and the outer epoxy glass tube. The stationary contacts are installed in both ends of the insulating support and the moveable contacts are mounted on both ends of the fuse tube. The load-break drop out fuse cutout is added with elastic auxiliary contacts and interrupter cover for switching load current.

During normal operation of the cut-out fuse, the fuse element strains to form a closed position. When a fault arises in the system, the fuse element is blown quickly by the fault current and arc is formed. The arc suppression tube is heated by the arc and large amounts of gases are released, so that the pressure inside the tube becomes very high. The released gases blow along the longitudinal direction of the tube. Then, the arc is elongated rapidly and extinguished.

After the fuse element blows, the bottom moveable contact turns down due to the absence of tension. The locking mechanism releases the fuse element and the element drops, forming a distinct breaking position.

When there is a need to break the load, use an insulating stick to open the moving contact. At this time, the main moving and stationary contacts are separated, but the auxiliary contacts are still in contact. Then, continue to open the moving contact with the insulating stick until the moving contact is isolated from the auxiliary contact. Afterwards, electrical arc occurs between the auxiliary contacts and it is elongated in the slit of the interrupter cover. Meanwhile, gases are released in the interrupter cover. When the current crosses zero, the arc is extinguished.

Components of Drop Out Fuse Cutout
No. Component name
1 Nut
2 Threaded rod
3 Mounting bracket I
4 Mounting bracket II
5 Porcelain insulator
6 Spring washer
7 One-piece channel
8 Fuse tube
9 Lower socket
10 Lower contacts
11 Connector
12 Upper contacts
13 Load break hook
14 Pull ring
Main Technical Parameters of Drop Out Fuse Cutout
Model Rated voltage (KV) Rated current (A) Breaking current
(A)
Impulse voltage (BIL) Power-frequency withstand voltage (kV) Creepage distance (mm) Weight (kg) Dimensions
(cm)
RTF-1 10-15 100 10000 110 42 245 7 38.5×34.5´10.5
200 12000 110 42 245 7
RTF-2 10-15 100 10000 110 40 250 7.3 38.5´34.5´10.5
200 12000 110 40 250 7.3
RTF-3 10-15 100 6000 110 40 340 7.5 49×27×11
200 8000 110 40 340 7.5
RTF-4 10-15 100 10000 110 40 245 8.5 48.5´44´13.5
200 12000 110 40 245 8.5
RTF-5 15-27 100 10000 125 45 350 8.2 51.5´34´12
200 12000 125 45 350 8.2
RTF-6 15-27 100 10000 125 45 350 8.5 48×35×10.5
200 12000 125 45 350 8.5
RTF-7 15-27 100 10000 125 45 350 8.5 45×34.5×12
200 12000 125 45 350 8.5
RTF-8 24-27 100 8000 150 50 530 10.5 48×34.5×14
200 10000 150 50 530 10.5
RTF-9 24-27 100 8000 150 65 520 10.5 48´34.5´14
200 10000 150 65 520 10.5
RTF-10 24-27 100 8000 150 50 530 10.5 49×35×14
200 10000 150 50 530 10.5
RTF-11 24-27 100 10000 150 65 560 5.5 49×35×14.5
200 12000 150 65 560 5.5
RTF-12 12-15 100 10000 110 45 350 3.8 45×34×11.5
200 12000 110 45 350 3.8
RTF-13 27-33 100 6000 170 70 660 15 56´38´14.5
200 8000 170 70 660 15
RTF-14 33-36 100 10000 170 70 720 15.5 57´38´14.5
200 12000 170 70 720 15.5
RTF-15 33-36 100 8000 170 70 820 27.5 68×17×15
200 10000 170 70 820 27.5
RTF-16 33-36 100 10000 170 70 720 5 61×34×11.5
200 12000 170 70 720 5
RTF-17 35-38 100 6300 175 95 1145 16 90´40´13
200 8000 175 95 1145 16
RTF-18 24-36 100 8000 200 81 1130 7.5 70´65´17
200 10000 200 81 1130 7.5
RTF-19 24-27 100 8000 150 65 530 12 48×34.5×14
200 10000 150 65 530 12
RTF-20 10-15 100 10000 110 40 250 7.3 39.5´36.5´10.5
200 12000 110 40 250 7.3
RTF-21 15-27 100 10000 125 45 350 8.2
200 12000 125 45 350 8.2
RTF-22 15-27 100 10000 125 45 350 8.2 51.5×34×12
200 12000 125 45 350 8.2
RTF-23 33-36 100 10000 170 70 720 15.5 63×38×14.5
200 12000 170 70 720 15.5
RTF-24 15-27 100 10000 125 45 350 8.2 51.5×34×12
200 12000 125 45 350 8.2

Note:
The product with the rated voltage of 24kV has passed the tests in DNV KEMA Laboratories of the Netherlands.

Other Picture

Related Names
Distribution Transformer Protection Fuse | Isolation Fuse | High Voltage Cutout Switch

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