FR-1 Series Drop-out Fuse Outdoor High-Voltage Protection Device Short-Circuit and Overload Protection

Product Overview

The FR-1 series drop-out fuse is an outdoor high-voltage protection device installed on the high-voltage side of 10kV distribution transformers or on branch trunk lines of distribution lines. It serves as a commonly used short-circuit protection switch for overload and short-circuit protection of transformers or lines, as well as for making and breaking load currents. Its structure consists of an insulating support and a fuse tube. The fixed contacts are installed at both ends of the insulating support, and the moving contacts are installed at both ends of the fuse tube. The fuse tube is composed of an inner arc-extinguishing tube and an outer epoxy fiberglass tube. Load-break drop-out fuses are equipped with resilient auxiliary contacts and an arc chute for making and breaking load currents.

Drop-out fuses installed on branch lines of 10kV distribution lines can reduce the scope of power outages. Because they provide a clear disconnection point, they also function as disconnectors, creating a safe working environment for line and equipment maintenance and increasing the safety of maintenance personnel. When installed on distribution transformers, they can serve as the primary protection for the transformer. Therefore, they have become widely popular in 10kV distribution lines and distribution transformers. They are economical, easy to operate, and highly adaptable to outdoor environments, and are widely used on the primary side of 10kV distribution lines and distribution transformers for protection and equipment switching operations.

During normal operation, the fuse tube is held in the closed position by the tension of the fuse element. When a fault occurs in the system, the fault current causes the fuse element to melt rapidly, creating an arc. The arc-extinguishing tube, subjected to the intense heat of the arc, decomposes a large amount of gas, creating high pressure inside the tube, which is blown longitudinally, rapidly elongating and extinguishing the arc. After the fuse element melts, the lower moving contact loses tension and flips downward, and the locking mechanism releases the fuse tube, which then drops, forming a clear disconnection position. When it is necessary to break the load, an insulating pole is used to operate the contact. At this point, the main moving and fixed contacts are still in contact. As the insulating pole continues to pull the contact, the auxiliary contacts also separate, creating an arc between them. The arc is elongated in the narrow slot of the arc chute, and the arc chute generates gas, extinguishing the arc at current zero.

Product Name: Drop-out Fuse (Export Type)

Rated Voltage: 10kV, 12kV, 15kV, 24kV, 33kV, 35kV

Rated Current: 100A, 200A

Breaking Current: 6300A, 10000A, 8000A, 12500A

Impulse Voltage: 110BIL, 125BIL, 150BIL, 170BIL

Creepage Distance: 320mm, 530mm, 720mm

Structure Diagram

Installation Position Diagram

Technical parameters

12KV-15KV

Rated voltage (kv)	Rated current (A)	Breaking current (A)	Impulse voltage (BIL)	Power-frequency withstand voltage	Leakage distance (MM)	Weight (KG)	Dimensions (CM)
12	100	6300	110	40	250	6.5	40×36 ×11.5
12	200	10000	110	40	250	6.5

15KV-27KV

Rated voltage (kv)	Rated current (A)	Breaking current (A)	Impulse voltage (BIL)	Power-frequency withstand voltage	Leakage distance (MM)	Weight (KG)	Dimensions (CM)
15	100	8000	125	45	320	7.5	50×36 ×12.5
15	200	12500	125	45	320	7.5

24KV-27KV

Rated voltage (kv)	Rated current (A)	Breaking current (A)	Impulse voltage (BIL)	Power-frequency withstand voltage	Leakage distance (MM)	Weight (KG)	Dimensions (CM)
24	100	8000	150	65	530	12	50×38 ×16
24	200	12500	150	65	530	12

33KV-36KV

Rated voltage (kv)	Rated current (A)	Breaking current (A)	Impulse voltage (BIL)	Power-frequency withstand voltage	Leakage distance (MM)	Weight (KG)	Dimensions (CM)
33	100	10000	170	70	720	15	64×35 ×18
33	200	12500	170	70	720	15

15KV-27KV

Rated voltage (kv)	Rated current (A)	Breaking current (A)	Impulse voltage (BIL)	Power-frequency withstand voltage	Leakage distance (MM)	Weight (KG)	Dimensions (CM)
15	100	8000	125	45	320	8	58×40 ×15
15	200	12500	125	45	320	8

15KV-27KV

Rated voltage (kv)	Rated current (A)	Breaking current (A)	Impulse voltage (BIL)	Power-frequency withstand voltage	Leakage distance (MM)	Weight (KG)	Dimensions (CM)
15	100	8000	125	45	320	7.5	50×36 ×12.5
15	200	12500	125	45	320	7.5

12KV-15KV

Rated voltage (kv)	Rated current (A)	Breaking current (A)	Impulse voltage (BIL)	Power-frequency withstand voltage	Leakage distance (MM)	Weight (KG)	Dimensions (CM)
12	100	6300	110	40	250	6	40×36 ×11.5
12	200	10000	110	40	250	6

24KV-27KV

Rated voltage (kv)	Rated current (A)	Breaking current (A)	Impulse voltage (BIL)	Power-frequency withstand voltage	Leakage distance (MM)	Weight (KG)	Dimensions (CM)
24	100	8000	150	65	530	7	50×38 ×16
24	200	12500	150	65	530	7

33KV-36KV

Rated voltage (kv)	Rated current (A)	Breaking current (A)	Impulse voltage (BIL)	Power-frequency withstand voltage	Leakage distance (MM)	Weight (KG)	Dimensions (CM)
36	100	10000	170	70	720	7	61×34×11.5
36	200	12000	170	70	720	7	61×34×11.5

33KV-36KV

Rated voltage (kv)	Rated current (A)	Breaking current (A)	Impulse voltage (BIL)	Power-frequency withstand voltage	Leakage distance (MM)	Weight (KG)	Dimensions (CM)
33	100	10000	170	70	720	8	64×35×18
33	200	12500	170	70	720	8	64×35×18

15KV-27KV

Rated voltage (kv)	Rated current (A)	Breaking current (A)	Impulse voltage (BIL)	Power-frequency withstand voltage	Leakage distance (MM)	Weight (KG)	Dimensions (CM)
15	100	8000	125	45	320	8	58×40×15
15	200	12500	125	45	320	8	58×40×15

15KV-27KV

Rated voltage (kv)	Rated current (A)	Breaking current (A)	Impulse voltage (BIL)	Power-frequency withstand voltage	Leakage distance (MM)	Weight (KG)	Dimensions (CM)
15	100	8000	125	45	320	6.5	50×36×12.5
15	200	12500	125	45	320	6.5	50×36×12.5