H.V. HRC Current-Limiting Fuses type S for Transformer Protection

H.V. current-limiting fuses type S is mainly used in AC50Hz, rated voltage 3.6-40.5kV,rated current up to 200A circuit for protectiontransformers and power equipments from overload and short-circuit. It can also be used with load switch, vacuum contact.
It conforms to IEC282-1, GB15166.2 and DIN standard.

S type H.V. HRC current-limiting fuses is insert installation. The striker parallels to the fuse element made from pure silver. They aresealed in the fuse tube filled with chemically treated high-purity quartz sand. The fuse tube is made from heat resistance, high duty ceramicor expoxy glass. When fault circuit happens, the fuse link melts, the high-resistant metal wire paralleling to fuse links melts immediatelyat the appearance of the arc, and the striker jumps out to push the chained equipment contact, signaling the melting automatically cuttingthe circuit. The striker has spring type and powder type. Spring type striker use energy released by spring to push the strker; Powder typestriker use high pressure caused by the lighting powder to push the striker.S type H.V. HRC current-limiting fuses has many merits ashigh current-limiting ablilty, high breaking capacity, quick and punctual in action, reliable in performance.

Basic Data

Models		Ratedvoltage (KV)	Rated current of the fuse links(A)	Rated breakingcurrent (KA)	Dimensions (mm) Figure 1			Weight (Kg)
Foreign	Department	Ratedvoltage (KV)	Rated current of the fuse links(A)	Rated breakingcurrent (KA)	Fig.	ΦD	L	Weight (Kg)
SDO.J	XRNT1	3.6	6.3, 10, 16, 20, 25, 31.5, 40	31.5	Figure 1	51	192	1.12
SDL.J	XRNT1	7.2	6.3, 10, 16, 20, 25, 31.5, 40, 50, 63	31.5		51	292	1.47
SFL.J	XRNT1	7.2	80, 100, 125, 160	31.5		76	292	3.15
SDL.J	XRNT1	12	6.3, 10, 16, 20, 25, 31.5, 40	31.5		51	292	1.47
SFL.J	XRNT1	12	50, 63, 71, 80, 100	31.5		76	292	3.15
SKL.J	XRNT1	12	125	31.5		76	292	3.15
SXL.J	XRNT1	12	160, 200	31.5		88	292	4.15
SDM.J	XRNT1	24	6.3, 10, 16, 20, 25, 31.5, 40	31.5		51	442	2.7
SFM.J	XRNT1	24	50, 63, 71, 80, 100	31.5		76	442	4.5
SKM.J	XRNT1	24	125	31.5		76	442	4.5
SXM.J	XRNT1	24	160	31.5		88	442	5.4
SDQ.J	XRNT1	40.5	3.15, 6.3, 10, 16, 20, 25	31.5		51	537	2.9
SFQ.J	XRNT1	40.5	31.5, 40	31.5		76	537	5.51
SXQ.J	XRNT1	40.5	63	31.5		88	537	6.5

Note:

Under stipulated condition, min. breaking current of fuses could be as highas 2.5~3.0 times than rated current.

Selection of Prodper Fuse Links for Transformer Protection

Transformer capacity(KVA)	Transformer proimary voltage (KV)
	7.2	10	20	30
	Fuse model/Rated current(A)	Fuse model/Rated current(A)	Fuse model/Rated current(A)	Fuse model/Rated current(A)
50	SDL.J-7.2KV/ 8A	SDL.J-12KV/ 6.3A	SDM.J-24KV/ 3.15A	SDQ.J-40.5KV/ 3.15A
100	SDL.J-7.2KV/ 16A	SDL.J-12KV/ 10A	SDM.J-24KV/ 6.3A	SDQ.J-40.5KV/ 6.3A
125	SDL.J-7.2KV/ 20A	SDL.J-12KV/ 12A	SDM.J-24KV/ 6.3A	SDQ.J-40.5KV/ 6.3A
160	SDL.J-7.2KV/ 25A	SDL.J-12KV/ 16A	SDM.J-24KV/ 8A	SDQ.J-40.5KV/ 6.3A
200	SDL.J-7.2KV/ 31.5A	SDL.J-12KV/ 20A	SDM.J-24KV/ 10A	SDQ.J-40.5KV/ 8A
250	SDL.J-7.2KV/ 40A	SDL.J-12KV/ 25A	SDM.J-24KV/ 12A	SDQ.J-40.5KV/ 10A
300/ 315	SDL.J-7.2KV/ 50A	SDL.J-12KV/ 31.5A	SDM.J-24KV/ 16A	SDQ.J-40.5KV/ 10A
400	SDL.J-7.2KV/ 63A	SDL.J-12KV/ 40A	SDM.J-24KV/ 20A	SDQ.J-40.5KV/ 16A
500	SDL.J-7.2KV/ 80A	SDL.J-12KV/ 50A	SDM.J-24KV/ 25A	SDQ.J-40.5KV/ 16A
630	SDL.J-7.2KV/ 100A	SDL.J-12KV/ 63A	SDM.J-24KV/ 31.5A	SDQ.J-40.5KV/ 20A
750/ 800	SDL.J-7.2KV/ 125A	SDL.J-12KV/ 80A	SDM.J-24KV/ 40A	SDQ.J-40.5KV/ 25A
1000	SDL.J-7.2KV/ 160A	SDL.J-12KV/ 100A	SDM.J-24KV/ 50A	SDQ.J-40.5KV/ 31.5A
1250		SDL.J-12KV/ 125A	SDM.J-24KV/ 63A	SDQ.J-40.5KV/ 40A
1600		SDL.J-12KV/ 160A	SDM.J-24KV/ 80A	SDQ.J-40.5KV/ 50A
2000		SDL.J-12KV/ 200A	SDM.J-24KV/ 100A	SDQ.J-40.5KV/ 63A

Figure 1

Time-current characteristics of fuse link type S

Breaking-current characteristics of fuse link type S

I².t characteristics of fuse link type S