Wholesale HR3 Fuse Type Knife Switch for Motor Protection Suppliers, Companies

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Wholesale HR3 Fuse Type Knife Switch for Motor Protection Suppliers, Companies

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 -35Â°C to +40Â°C, with Pollution Degree 3 compliance. The HR3 switch features corrosion-resistant construction and handles 90% humidity (at 20Â°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 le(A)	AC 400V Models
Rated Heating Current Ith (A)	Rated Operating Current le(A)	Front-side Horizontal Lever	Front-center Horizontal Lever	Front-side Hand-operated	Front-panel-front-side Lever
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

01 The ambient air temperature shall not be higher than +40℃ and not lower than -35℃.

02 The altitude of the installation site shall not exceed 5000m.

03 Humidity: When the maximum temperature is +40℃, the relative humidity shall not exceed 50%. At lower temperatures, higher humidity is allowed (e.g., 90% at 20℃).

04 The pollution level of the ambient environment is Grade 3.

05 Installed in a place without severe vibration, corrosive gases, or explosive media. Site must be free of dust that can damage insulation.

Product Display

Technical Parameters

Model	Rated Operating Voltage Us(V)	Rated Insulation Voltage Ui(V)	Rated Heating Current Ith (A)	Rated Operating Current le(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	50
HR3-400			400	400	RTO-40	50
HR3-600			600	600	RT0-600	50
HR3-1000			1000	1000	RT0-1000	50

Outline and Installation Dimensions

Outline and Installation Dimensions of HR3/32 Series Switches

Model	Dimensions (mm)
Model	A	B	C	D	E	H	J	R	M	Φ
HR3-100/32	250	170	210	130	60	190	162	180	8	7
HR3-200/32	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
HR3-1000/32	410	310	348	248	115	280	276	230	12	8.5

Outline and Installation Dimensions of HR3/33 Series Switches

Model	Dimensions (mm)
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

Outline and Installation Dimensions of HR3/34 Series Switches

Model	Dimensions (mm)
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 is the primary function of the HR3 series fuse-disconnector?

The HR3 series is designed to act as a manual multi-pole link switch in power distribution systems, providing both circuit disconnection and over-current protection via the integrated fuse.

Can this switch be installed at high altitudes?

Yes, the HR3 series is suitable for installations at altitudes up to 5000 meters, making it highly versatile for various geographical locations.

What are the ambient temperature requirements for operation?

The switch is designed to operate reliably within an ambient air temperature range of -35°C to +40°C.

Are there different operation methods available?

Yes, the HR3 offers several operation modes, including front-side lever transmission, front-central lever transmission, and side operating handle types to suit different cabinet configurations.

Does the HR3 series support rear maintenance?

Yes, specific models like the front central lever transmission mechanism type (coded "2") are specifically designed for rear maintenance applications.

What protection level is required for the installation environment?

The environment should be Grade 3 pollution level, free from severe vibration, corrosive gases, and explosive media to ensure safe operation.