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NH Series Low Voltage HRC Fuse Knife Type Contact Fuse - Quality China Suppliers and Factory Solutions
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. Complies with IEC 60269-1 and IEC 60269-2 standards, and has obtained TUV, CE, CB certifications.
Usage Categories & Standards
Multiple usage categories including gG/gL, aR, and aM. Complies with IEC60269 and DIN 43620 standards, ensuring 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.
Humidity & Temperature
- Working humidity: Max 40℃, RH ≤ 50%. Max 20℃, RH ≤ 90%.
- Working temp (Tj): -5℃ to 40℃. (Correction factor Kt required beyond this range).
Salt Spray & Flame Retardant
- Salt spray: GB/T 2423.17, t=24h.
- Flame retardant: Rating (UL94) V-0 for combustible materials like plastics.
Altitude Considerations
Not exceeding 2000m. When exceeding:
1) Temp rises ~0.5k per 100m.
2) Ambient temp decreases ~0.5℃ per 100m.
3) Open environments can ignore altitude influence.
4) Closed environments require derating: I=In × (1- (h-2000)/100 × 0.5 ÷ 100).
1) Temp rises ~0.5k per 100m.
2) Ambient temp decreases ~0.5℃ per 100m.
3) Open environments can ignore altitude influence.
4) Closed environments require derating: I=In × (1- (h-2000)/100 × 0.5 ÷ 100).
Maintenance and storage
1. Storage
Store fuse links protected from rain and snow, in a well-ventilated warehouse with relative humidity (at 25℃) ≤ 90%, and temperature between -30℃ and 40℃.
2. Maintenance
1) Regularly clean dust and check contact conditions.
2) Power supply must be cut off during maintenance; live removal is strictly prohibited.
2) Power supply must be cut off during maintenance; live removal is strictly prohibited.
Detail pictures
Frequently Asked Questions
What are the main electrical parameters of CHZU series NH fuses?
The CHZU series low-voltage NH type fuses have a rated current range of 2 to 1250 amperes. They are suitable for AC 500V, 690V, and DC 440V circuits.
What international standards do these NH series fuses comply with?
They comply with IEC 60269-1, IEC 60269-2, and DIN 43620 standards. Additionally, they have obtained TUV, CE, and CB certifications.
How does the dual indication system work?
The system features both top and middle indicators. The top indicator is designed for direct visual inspection, while the middle indicator is optimized for remote indication or complex, hard-to-see installation environments.
What are the environmental limits for these fuses?
The working temperature range is -5℃ to 40℃, and the humidity should not exceed 50% at 40℃ (or 90% at 20℃). They are rated for altitudes up to 2000 meters, above which a derating correction factor must be applied.
What are the storage and maintenance requirements?
Fuses should be stored in a dry, ventilated area (-30℃ to 40℃, RH ≤ 90%). Maintenance requires regular dust cleaning and contact checks, which must always be performed with the power supply disconnected.