Wholesale HR3 Fuse Type Knife Switch for Motor Protection Manufacturers, Factories

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Wholesale HR3 Fuse Type Knife Switch for Motor Protection Manufacturers, Factories

The HR3 Fuse Type Knife Switch combines robust circuit isolation with fused protection, supporting 100-1000A loads at AC400V with 500V insulation. This fuse-type knife switch integrates RT0 series fuse bases for 50kA short-circuit protection, ensuring reliable fault interruption in industrial power systems. Designed for harsh environments, it operates at altitudes up to 5000m and temperatures from -35°C to +40°C, with Pollution Degree 3 compliance. The HR3 switch features corrosion-resistant construction and handles 90% humidity (at 20°C), making it ideal for distribution panels requiring manual control and safety in demanding conditions.

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Product Description

Type and Meaning

1	Fuse-disconnector
2	Design Code
3	Conventional Free-air Thermal Current (A)
4	Number of Poles (3)
5	Operation Method and Maintenance Direction: • 1 indicates front side lever transmission mechanism type, front maintenance • 2 indicates front central lever transmission mechanism type, rear maintenance • 3 indicates side operating handle type, front maintenance • 4 indicates front side lever transmission mechanism type without panel, front maintenance
6	With BX indicates rotary operation type; Without BX indicates lever operation type (Only for front central type)

Rated Heating Current Ith (A)	Rated Operating Current Ie (A)	AC 400V
Rated Heating Current Ith (A)	Rated Operating Current Ie (A)	HR3 with Front-side Horizontal Lever-type Operation Mechanism	HR3 with Front-center Horizontal Lever-type Operation Mechanism	HR3 with Front-side Hand-operated Mode	HR3 with Front-panel-front-side Lever-type Operation Mechanism
100	100	HR3-100/31	HR3-100/32	HR3-100/33	HR3-100/34
200	200	HR3-200/31	HR3-200/32	HR3-200/33	HR3-200/34
400	400	HR3-400/31	HR3-400/32	HR3-400/33	HR3-400/34
600	600	HR3-600/31	HR3-600/32	HR3-600/33	HR3-600/34
1000	1000	--	HR3-1000/32	HR3-1000/33	HR3-1000/34

Normal Operating Conditions

1. The ambient air temperature shall not be higher than +40℃ and not lower than -35℃.
2. The altitude of the installation site shall not exceed 5000m.
3. Humidity: When the maximum temperature is +40℃, the relative humidity of the air shall not exceed 50%. At lower temperatures, a higher relative humidity is allowed, such as 90% at 20℃. However, appropriate measures shall be taken due to the influence of temperature changes.
4. The pollution level of the ambient environment is Grade 3.
5. The switch shall be installed in a place without severe vibration, and without corrosive gases. Meanwhile, the installation site shall be free of explosive media, and the air in the medium shall be free of gases and dust that can corrode metals and damage insulation.

Product Display

Technical Parameters

Model	Rated Operating Voltage Ue (V)	Rated Insulation Voltage Ui (V)	Rated Heating Current Ith (A)	Rated Operating Current Ie (A)	Fuse Base Model	Rated Limiting Short-circuit Current (kA)
HR3-100	400	500	100	100	RT0-100	50
HR3-200			200	200	RT0-200
HR3-400			400	400	RTO-40
HR3-600			600	600	RT0-600
HR3-1000			1000	1000	RT0-1000

Outline and Installation Dimension

Outline and Installation Dimensions of HR3/32 Series Switches

Model	Outline and Installation Dimensions
Model	A	B	C	D	E	H	J	R	M	φ
HR3-100/32	250	170	210	130	60	190	162	180	8	7
HR3-20032	270	170	230	130	70	193	176	180	10	7
HR3-400/32	290	170	250	130	80	194	194	180	12	7
HR3-600/32	320	180	280	130	90	213	218	180	16	7
HR3-100032	410	310	348	248	115	280	276	230	12	8.5

Outline and Installation Dimensions of HR3/33 Series Switches

Model	Outline and Installation Dimensions
Model	A	B	C	D	E	F	G	H	J	M	Φ
HR3-100/33	250	200	210	170	60	77	68	190	162	8	7
HR3-200/33	270	205	230	170	70	77	60	193	176	10	7
HR3-400/33	290	290	250	170	80	77	55	194	194	12	7
HR3-600/33	320	320	280	170	90	94	50	214	218	16	7

Note: Dimension marked with F is the size when the operating handle is in the maximum open position.

Outline and Installation Dimensions of HR3/34 Series Switches

Model	Outline and Installation Dimensions
Model	A	B	C	D	E	F	G	H	R	J	M	Φ
HR3-100/34	250	200	210	170	60	80	43	250	180	162	8	7
HR3-200/34	270	205	230	170	70	80	53	250	180	176	10	7
HR3-400/34	290	225	250	170	80	80	43	250	180	194	12	7
HR3-600/34	320	265	280	170	90	95	43	250	180	218	16	7
HR3-1000/34	410	352	348	248	115	115	65	350	230	276	12	8.5

Note: Dimension marked with F is the size when the operating handle is in the maximum open position.

Frequently Asked Questions

What does the designation "HR3" signify?

In the model designation, "H" stands for Fuse-disconnector, "R" is the design code, and "3" represents the specific generation or series iteration of this product line.

What are the available operating mechanisms for HR3 series switches?

The HR3 series supports multiple operation mechanisms including front side lever transmission (front maintenance), front central lever transmission (rear maintenance), side operating handle (front maintenance), and front side lever without panel. It also offers rotary (indicated with "BX") or lever operation for central mechanisms.

What is the rated limiting short-circuit current capability for the HR3 series?

All models across the HR3 series—from HR3-100 to HR3-1000—feature a rated limiting short-circuit current of 50 kA under 400V operation.

What are the environmental requirements for HR3 switch installations?

The switch must operate in temperatures between -35℃ and +40℃ at an altitude up to 5000m. The area should conform to pollution degree 3 and remain free from corrosive gases, explosive media, severe vibration, and damaging conductive dust.

Which fuse bases are compatible with HR3 series disconnectors?

Compatible fuse base models match the current rating: RT0-100 for HR3-100, RT0-200 for HR3-200, RTO-40 for HR3-400, RT0-600 for HR3-600, and RT0-1000 for HR3-1000.

What rated current levels are supported by HR3 series switches?

The series is designed for multiple standard current capacities including 100A, 200A, 400A, 600A, and up to 1000A for large-scale circuit switching and protection.

Wholesale HR3 Fuse Type Knife Switch for Motor Protection Manufacturers, Factories

Product Description

Type and Meaning

Normal Operating Conditions

Product Display

Technical Parameters

Outline and Installation Dimension

Frequently Asked Questions

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