NH3 Size 3 gG HRC Knife-Blade Fuse Link - 120kA Breaking Capacity from China Suppliers & Factory for Low-Voltage Protection
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The MIRO NH3 Size 3 square-tube knife-blade HRC fuse link is meticulously designed for optimal performance in cable and circuit protection. With overall dimensions of 210 × 94 × 84 mm, this fuse link is compliant with IEC 60269‑2 and GB/T 13539.2 standards, making it a reliable choice for both domestic and international applications. Rated at AC 500V/690V, it features a breaking capacity of 100kA at 500V and 50kA at 690V, accommodating a current range of 315‑800A. Its standard plug-in knife-blade design allows for quick and easy replacements in NH3 series fuse bases. This product is widely utilized in low-voltage power cabinets, distribution switchboards, and heavy-duty industrial power systems. As a leading factory in China, we ensure high-quality manufacturing and reliable supply to meet the demands of various industrial sectors.
Data Sheet & Overview
MIRO NH3 (RO35) measures 210 × 94 × 84 mm, it is a gG category knife‑blade fuse link, rated voltage 500V/690V, breaking capacity up to 100kA at 500V and 50kA at 690V, current range 315‑630A, square‑tube knife‑blade plug‑in installation.
This product is fully matched with mainstream international brands in electrical performance and installation dimension for direct replacement, no cabinet or base modification required:
- Mersen NH3 gG Series: Replaceable with identical voltage, breaking capacity and dimension, directly compatible with original fuse base.
- Eaton NH3 Series: Interchangeable, same gG utilization category and universal plug‑in structure.
- Littelfuse NH3-Style: Direct substitute knife‑blade fuse, identical electrical parameters and physical dimension for seamless retrofit.
- Siemens 3NA3 Series: Replacement that fits existing switchgear without mechanical alteration.
- Bussmann NHG3B: Drop‑in alternative fuse with equivalent protection performance.
Application scenario: Overload and short‑circuit protection for cables and circuits in low‑voltage power cabinets, switchgears and industrial power distribution systems.
Technical Specifications
| Parameter | Value | Test Standard / Method |
|---|---|---|
| Frequency | 45‑62Hz | Test by network analyzer |
| Rated working Voltage | 500V / 690V | Voltmeter |
| Rated working Current |
500V: 315A, 355A, 400A, 425A, 500A, 630A 690V: 315A, 355A, 400A, 425A, 500A |
Ammeter, clamp meter |
| Utilization category | gG | GB 13539.1‑2015, GB/T 13539.2‑2015 |
| Power dissipation | 60W Max | Millivoltmeter |
| Breaking capacity | 500V: 100kA 690V: 50kA |
Type test |
| Component temperature rise | 70K | I‑t characteristic test bench, temperature rise tester |
| Installation method | Square‑tube knife‑blade plug‑in type | - |
Products Size
Applications
Protection against overload and short-circuit in electric lines (type gG), also available for protection of semiconductor parts and equipments against short-circuit (type aR) and protection of motors (type aM).
Design Features
Variable cross-section fuse element made from pure copper or silver sealed in cartridge made from high-duty ceramic; Fuse tube filled with chemically treated high-purity quartz sand as arc extinguishing medium. Dot-welding of fuse element ends to the terminals ensures reliable electric connection and forms insert knife type contacts. Indicator or striker may be attached to the fuse link to show cutout of fuse or to give various signals and to cut the circuit automatically.