HRW/RW Series 12kV Drop-out Fuse Outdoor High-Voltage Protection Device

Product Overview

12kV series drop-out fuses are critical outdoor high-voltage protection devices in power transmission and distribution systems. They are installed on the high-voltage side of distribution transformers or on branch trunk lines of distribution lines, serving as short-circuit and overload protection for transformers and lines, as well as for making and breaking load currents. These 12kV drop-out fuses have notable features: 1. After installing a high-voltage fuse element, they protect the circuit and reliably interrupt fault currents; 2. They use composite (silicone rubber) material insulators, providing excellent insulation performance and strong weather resistance; 3. After the fuse element melts, the fuse tube drops automatically, forming a clear isolation distance, ensuring very safe operation.

Composite drop-out fuses consist of a composite (silicone rubber) 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 phenolic paper tube or epoxy fiberglass tube. Load-break drop-out fuses, such as the HRW series, are enhanced with resilient auxiliary contacts and an arc chute for safely making and breaking load currents.

The HRW and RW series 12kV drop-out fuses produced and sold by FAURE/Gaosuo Electric are held in the closed position by the tension of the fuse element during normal operation. 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 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 automatically, forming a clear disconnection position. When it is necessary to break the load, an insulating pole is used to pull the moving 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.

Main Technical Parameters

Below is a table of main models and parameters for the HRW/RW series 12kV drop-out fuses, for reference in selection.

12KV

Type	Rated voltage (kv)	Rated current (A)	Breaking current (A)	Impulse voltage (BIL)	Power-frequency withstand voltage	Leakage distance (MM)	Weight (KG)	Dimensions (CM)
RW11	12	100	6300	110	42	260	7.5	48×32 ×27
RW11	12	200	8000	110	42	260	7.5

12KV

Type	Rated voltage (kv)	Rated current (A)	Breaking current (A)	Impulse voltage (BIL)	Power-frequency withstand voltage	Leakage distance (MM)	Weight (KG)	Dimensions (CM)
RW10(F)	12	100	6300	110	42	260	7.5	58×32 ×37
RW10(F)	12	200	8000	110	42	260	7.5

12KV

Type	Rated voltage (kv)	Rated current (A)	Breaking current (A)	Impulse voltage (BIL)	Power-frequency withstand voltage	Leakage distance (MM)	Weight (KG)	Dimensions (CM)
RW11(F)	12	100	6300	110	42	260	7.5	53×32 ×37
RW11(F)	12	200	8000	110	42	260	7.5

12KV

Type	Rated voltage (kv)	Rated current (A)	Breaking current (A)	Impulse voltage (BIL)	Power-frequency withstand voltage	Leakage distance (MM)	Weight (KG)	Dimensions (CM)
HRW10	12	100	6300	110	42	260	6.8	53×32 ×37
HRW10	12	200	8000	110	42	260	6.8

12KV

Type	Rated voltage (kv)	Rated current (A)	Breaking current (A)	Impulse voltage (BIL)	Power-frequency withstand voltage	Leakage distance (MM)	Weight (KG)	Dimensions (CM)
HRW11	12	100	6300	110	42	260	6.5	48×32×27
HRW11	12	200	8000	110	42	260	6.5	48×32×27

12KV

Type	Rated voltage (kv)	Rated current (A)	Breaking current (A)	Impulse voltage (BIL)	Power-frequency withstand voltage	Leakage distance (MM)	Weight (KG)	Dimensions (CM)
HRW3	10	100	6300	110	42	260	6.5	48×32×27
HRW3	10	200	8000	110	42	260	6.5	48×32×27

12KV

Type	Rated voltage (kv)	Rated current (A)	Breaking current (A)	Impulse voltage (BIL)	Power-frequency withstand voltage	Leakage distance (MM)	Weight (KG)	Dimensions (CM)
HRW10F	12	100	6300	110	42	260	6.8	53×32×37
HRW10F	12	200	8000	110	42	260	6.8	53×32×37

12KV

Type	Rated voltage (kv)	Rated current (A)	Breaking current (A)	Impulse voltage (BIL)	Power-frequency withstand voltage	Leakage distance (MM)	Weight (KG)	Dimensions (CM)
HRW11F	12	100	6300	110	42	260	6.5	48×32×27
HRW11F	12	200	8000	110	42	260	6.5	48×32×27