Drop Out Fuse Cutout

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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
RTF-1	10-15	200	12000	110	42	245	7	38.5×34.5´10.5
RTF-2	10-15	100	10000	110	40	250	7.3	38.5´34.5´10.5
RTF-2	10-15	200	12000	110	40	250	7.3	38.5´34.5´10.5
RTF-3	10-15	100	6000	110	40	340	7.5	49×27×11
RTF-3	10-15	200	8000	110	40	340	7.5	49×27×11
RTF-4	10-15	100	10000	110	40	245	8.5	48.5´44´13.5
RTF-4	10-15	200	12000	110	40	245	8.5	48.5´44´13.5
RTF-5	15-27	100	10000	125	45	350	8.2	51.5´34´12
RTF-5	15-27	200	12000	125	45	350	8.2	51.5´34´12
RTF-6	15-27	100	10000	125	45	350	8.5	48×35×10.5
RTF-6	15-27	200	12000	125	45	350	8.5	48×35×10.5
RTF-7	15-27	100	10000	125	45	350	8.5	45×34.5×12
RTF-7	15-27	200	12000	125	45	350	8.5	45×34.5×12
RTF-8	24-27	100	8000	150	50	530	10.5	48×34.5×14
RTF-8	24-27	200	10000	150	50	530	10.5	48×34.5×14
RTF-9	24-27	100	8000	150	65	520	10.5	48´34.5´14
RTF-9	24-27	200	10000	150	65	520	10.5	48´34.5´14
RTF-10	24-27	100	8000	150	50	530	10.5	49×35×14
RTF-10	24-27	200	10000	150	50	530	10.5	49×35×14
RTF-11	24-27	100	10000	150	65	560	5.5	49×35×14.5
RTF-11	24-27	200	12000	150	65	560	5.5	49×35×14.5
RTF-12	12-15	100	10000	110	45	350	3.8	45×34×11.5
		200	12000	110	45	350	3.8	45×34×11.5
RTF-13	27-33	100	6000	170	70	660	15	56´38´14.5
RTF-13	27-33	200	8000	170	70	660	15	56´38´14.5
RTF-14	33-36	100	10000	170	70	720	15.5	57´38´14.5
RTF-14	33-36	200	12000	170	70	720	15.5	57´38´14.5
RTF-15	33-36	100	8000	170	70	820	27.5	68×17×15
RTF-15	33-36	200	10000	170	70	820	27.5	68×17×15
RTF-16	33-36	100	10000	170	70	720	5	61×34×11.5
RTF-16	33-36	200	12000	170	70	720	5	61×34×11.5
RTF-17	35-38	100	6300	175	95	1145	16	90´40´13
RTF-17	35-38	200	8000	175	95	1145	16	90´40´13
RTF-18	24-36	100	8000	200	81	1130	7.5	70´65´17
RTF-18	24-36	200	10000	200	81	1130	7.5	70´65´17
RTF-19	24-27	100	8000	150	65	530	12	48×34.5×14
RTF-19	24-27	200	10000	150	65	530	12	48×34.5×14
RTF-20	10-15	100	10000	110	40	250	7.3	39.5´36.5´10.5
RTF-20	10-15	200	12000	110	40	250	7.3	39.5´36.5´10.5
RTF-21	15-27	100	10000	125	45	350	8.2
RTF-21	15-27	200	12000	125	45	350	8.2
RTF-22	15-27	100	10000	125	45	350	8.2	51.5×34×12
RTF-22	15-27	200	12000	125	45	350	8.2	51.5×34×12
RTF-23	33-36	100	10000	170	70	720	15.5	63×38×14.5
RTF-23	33-36	200	12000	170	70	720	15.5	63×38×14.5
RTF-24	15-27	100	10000	125	45	350	8.2	51.5×34×12
RTF-24	15-27	200	12000	125	45	350	8.2	51.5×34×12

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

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

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