01
NH Series Low Voltage Hrc Fuse Knife Type Contact Fuse
Type and specification
There are various types and specifications of NH series low-voltage fuses, including:
CHZU series low-voltage NH type fuse: rated current range of 2 to 1250 amperes, suitable for AC500V, 690V, DC440V circuits. This series of fuses complies with IEC 60269-1 and IEC 60269-2 standards and has obtained TUV, CE, CB certifications.
The NH series low-voltage fuses have multiple usage categories, including gG/gL, aR, and aM. In addition, this series of fuses complies with IEC60269 and DIN 43620 standards, ensuring their performance and safety.
Dual indication system
The NH series fuse has a dual indication system, including top and middle indicators. The top indicator is mainly used for visual indication, while the middle indicator is suitable for remote indication or complex installation environments, ensuring that users can accurately identify the status of the fuse regardless of its position.
Application scenarios
The NH series low-voltage fuses are suitable for various low-voltage distribution systems and motor control circuits, especially in situations that require high reliability and remote signal transmission. Its durable structure and low power consumption characteristics make it perform well in photovoltaic systems and general cable protection
Applicable environment
NH series knife type contact fuse, suitable for AC systems, rated voltage of 500V, 690V, DC system 440V, rated current of 2A~1250A, used for overload and short circuit protection of low-voltage electrical equipment.
Applicable environment
1. Working humidity range: At a maximum temperature of 40 ℃, the relative humidity does not exceed 50%. At a maximum temperature of 20 ℃, the relative humidity does not exceed 90%.
2. Working temperature range (Tj): -5 ℃ to 40 ℃. Beyond this range, the rated current requires additional correction with a correction factor of Kt.
3. Salt spray: GB/T 2423.17, t=24h.
4. Altitude: not exceeding 2000m. When the altitude exceeds this value:
1) For every 100 meters increase in altitude, the temperature rise of the fuse is about 0.5k.
2) For every 100 meters increase in altitude, the average decrease in ambient temperature is about 0.5 ℃.
3) In general, fuses used in open environments can ignore the influence of altitude on rated current and still be selected according to standard conditions.
4) If the ambient air temperature or internal temperature of the fuse used in a closed environment does not significantly decrease with altitude and can still reach above 40 ℃, the rated current needs to be reduced. The formula for selecting the rated current of a fuse is: I=In × (1- (h-2000)/100 × 0.5 ÷ 100).
5. Flame retardant requirements (for combustible materials such as plastics): Flame retardant rating (UL94) V-0.
Maintenance and storage
1. Storage:
When storing fuse links, they should be protected from erosion by rain and snow, and stored in a well ventilated warehouse with a relative humidity (at 25 ℃) not exceeding 90%, a temperature not exceeding 40 ℃, and not lower than -30 ℃.
2. Maintenance:
1) Regularly clean the dust and check the contact condition of the contact points.
2) During maintenance and inspection, the power supply must be cut off according to safety regulations, and it is not allowed to remove the fuse when it is live
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