China HH15(QSA) Knife Melt Isolation Switch with Fuse Supplier, Company

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China HH15(QSA) Knife Melt Isolation Switch with Fuse Supplier, Company

The HH15(QSA) Knife Melt Isolation Switch with Fuse delivers robust circuit protection and isolation for industrial power systems, supporting 63A-1250A loads at AC380-660V. This isolation switch integrates fuse protection (NT00-NT3/RS0 series) with high short-circuit withstand (up to 100kA at 380V), ensuring reliable fault interruption. Featuring 3P/4P/3+N configurations and 15000-cycle mechanical endurance, the HH15 switch operates with low torque (7.5-40Nm) and complies with AC-23B utilization standards. Its compact design combines isolation and melting protection in one unit, ideal for motor control centers and distribution panels requiring safe maintenance and overload safety.

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Product Description

Type Designation

1	Isolator-fuse combination
2	Design serial number
3	Conventional heating current (A)
4	Number of poles: 2-pole, 3-pole, 4-pole
5	Indicates the number of auxiliary contacts: 0 - No auxiliary contacts; 1 - With 1 pair of auxiliary contacts; 2 - With 2 pairs of auxiliary contacts.
6	QP: indicates a structure without a fuse and with parallel contacts QA: indicates a structure without a fuse and with series contacts QSA or no letter: indicates a structure with a fuse and series contacts
7	Type Code Explanation, Single-Throw, S: Double-Throw

Technical Parameters

Specification (s)		63	125	160	250	400	630	800	1000	1250
Main pole number		3, 4, 3+N							3
Rated insulation voltage (V)		Ue=400 time, Uj=660; Ue=660 time, Uj=1000.
Rated working voltage (V)		AC=380, 660
Rated enclosed heating current (A)		63	125	160	250	400	630	800	1000	1250
Rated operating current (A)	400VAC-23B	63	125	160	250	400	630	800	1000	1250
	660VAV-23B	63	100	160	250	315	425	500	630	800
Rated limited short-circuit current 380VY/H (kA)		100							50
Rated limited short-circuit current 660V(kA)		50
Mechanical life (times)		15000	15000	12000	12000	12000	3000	500	500	500
Electrical life (times)		1000	1000	300	300	300	200	100	100	100
Fuse rated current (A) 400V/1660V time		63/63	125/100	160/160	250/250	400/315	630/425	800/500	1000/630	1250/800
Model of fuse tube with knife-type contacts		RDT16-00(NT00)			RDT16-1(NT1)	RDT16-2(NT2)	RDT16-3(NT3)		RS0
Operating torque (Nm)		7.5		16			30		40
Rated heating current of auxiliary contact ITH380V/AC-11 (A)		5

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Outline and Installation Dimensions

Outline and installation dimensions of HH15(QSA) series isolating switch-fuse combinations

Model specifications	A	B	C	D	E	F	G	H	I	L	L1	L2	L3
HH15-63	12	6	100	M5	2	39.5	72	38.5	9	199-250	250-301	301-385	180-199
HH15-125	15	7.5	116	M6	3	38.5	70	40.5	10	199-250	250-301	301-385	180-199

Model specifications	A	B	C	D	E	F	G	H	I	L	L1	L2	O
HH15-160	20	10	146	M8	4	44	107	65	46	226-284	284-342	342-400	120
HH15-250	25	12.5	160	M10	4	40	107	65	43.5	226-284	284-342	342-400	160
HH15-400	25	12.5	160	M10	6	38	107	65	43.5	226-284	284-342	342-400	160

Model specifications	A	B	C	D	E	F	G	H	I	L	L1	L2	L3
HH15-630	40	20	270	M12	6	33	B7	87	60	300-355	295-330	300-400	400-500

Model specifications	A	B1	C	D	E	F	G	H	I	L	L1	L2	L3
HH15-800/1000	50	18	340	M12	1	33	87	87	60	300-355	295-330	330-400	400-500
HH15(QSA)-800/3 Single Hole	50	18	340	M12	1	33	87	87	38	300-355	295-330	330-400	400-500

Model specifications	A	B	C	D	E	F	G	H	I	L	L1	L2	M	N	O
HH15-1250	70	17	370	M10	8	50	120	120	80	395-430	495-530	560-595	400	330	153

Frequently Asked Questions (FAQ)

Q What is the primary function of the HH15(QSA) series switch?

The HH15(QSA) series is an isolator-fuse combination designed for circuit isolation and short-circuit protection in electrical distribution systems under rated voltages up to 660V AC.

Q What are the differences between QP, QA, and QSA designations?

"QP" designates a unit without a fuse and configured with parallel contacts; "QA" indicates an assembly without a fuse but with series contacts; "QSA" specifies a configuration equipped with both a fuse and series contacts.

Q What pole configurations are supported by these switch-fuse units?

The units support 2-pole, 3-pole, 4-pole, and 3+N pole configurations depending on the specific model and current rating selected.

Q What is the rated short-circuit breaking capability of the series?

At 380V, models up to 630A provide a rated limited short-circuit current of 100kA, and 800A–1250A models provide 50kA. Across the complete range, the 660V rating supports up to 50kA.

Q Which types of fuse links are compatible with the HH15 switch-fuse units?

They accommodate knife-type contact fuse links, commonly models RDT16-00 (NT00), RDT16-1 (NT1), RDT16-2 (NT2), RDT16-3 (NT3), and RS0 series based on frame capacity.