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HR3 Fuse Type Knife Switch (4).jpg
HR3 Fuse Type Knife Switch (1).jpg
HR3 Fuse Type Knife Switch (3).jpg
HR3 Fuse Type Knife Switch (2).jpg
HR3 Fuse Type Knife Switch (4).jpg
HR3 Fuse Type Knife Switch (1).jpg
HR3 Fuse Type Knife Switch (3).jpg
HR3 Fuse Type Knife Switch (2).jpg

HR3 Fuse Type Knife Switch for Motor Protection - China Suppliers Factory for Industrial Use and Safety

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Introducing the HR3 Fuse Type Knife Switch, a premium solution for robust circuit isolation and fused protection, now available from reliable China suppliers and factory. This switch is designed to support impressive loads ranging from 100 to 1000A at AC 400V, featuring a 500V insulation rating. Equipped with RT0 series fuse bases, the HR3 ensures 50kA short-circuit protection, providing dependable fault interruption for industrial power systems. Crafted for durability in harsh environments, it operates efficiently at altitudes up to 5000m and temperatures from -35°C to +40°C, meeting Pollution Degree 3 standards. The corrosion-resistant construction allows the HR3 knife switch to perform reliably in conditions of up to 90% humidity (at 20°C), making it the ideal choice for distribution panels that require manual control and safety in demanding applications.

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    Product Details

    Type and Meaning
    HR3-10
    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
    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
    • ● The ambient air temperature shall not be higher than +40℃ and not lower than -35℃.
    • ● The altitude of the installation site shall not exceed 5000m.
    • ● 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.
    • ● The pollution level of the ambient environment is Grade 3.
    • ● 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
    HR3 Knife Switch (1)
    HR3 Knife Switch (2)
    HR3 Knife Switch (3)
    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 Dimension
    Outline and Installation Dimensions of HR3/32 Series Switches
    HR3-4
    Model Outline and Installation Dimensions
    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
    HR3-6
    Model Outline and Installation Dimensions
    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
    HR3-8
    Model Outline and Installation Dimensions
    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
    Q What is the HR3 fuse-disconnector used for?
    The HR3 fuse-disconnector is designed for use in AC 400V power distribution systems. It provides both circuit isolation and overcurrent protection by integrating a fuse base, making it suitable for industrial power distribution panels and switchgear cabinets.
    Q What current ratings are available for the HR3 series?
    The HR3 series is available in five rated heating current and rated operating current levels: 100A, 200A, 400A, 600A, and 1000A, covering a wide range of industrial load requirements.
    Q What are the different operation types for the HR3 switch?
    The HR3 series offers four operation methods: front side lever transmission mechanism (type 1, front maintenance), front central lever transmission mechanism (type 2, rear maintenance), side operating handle (type 3, front maintenance), and front side lever mechanism without panel (type 4, front maintenance). Additionally, a rotary operation type (BX) is available for front central models.
    Q What are the installation environment requirements for the HR3 switch?
    The HR3 switch should be installed in environments where the ambient temperature is between -35℃ and +40℃, altitude does not exceed 5000m, relative humidity is no more than 50% at 40℃, and the pollution level is Grade 3. The installation site must be free from severe vibration, corrosive gases, explosive media, and dust that could damage insulation or corrode metal parts.
    Q What is the rated limiting short-circuit current of the HR3 series?
    All models in the HR3 series (HR3-100, HR3-200, HR3-400, HR3-600, and HR3-1000) have a rated limiting short-circuit current of 50kA at AC 400V, providing reliable protection against high fault currents in industrial applications.
    Q How do I select the correct HR3 model for my application?
    To select the correct HR3 model, consider the required rated operating current (100A–1000A), the preferred operation and maintenance method (types 1–4), and whether rotary (BX) or lever operation is needed. Refer to the model designation table: for example, HR3-400/33 indicates a 400A rated current with side operating handle type and front maintenance configuration.