NH3 Size 3 gG HRC Knife‑Blade Fuse Link: 120kA Breaking Capacity for Heavy‑Duty Low‑Voltage Distribution & Switchgear Protection
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The MIRO NH3 Size3 square‑tube knife‑blade HRC fuse link has overall dimensions of 210 × 94 × 84 mm. It belongs to gG general‑purpose utilization category for cable and circuit protection. Compliant with IEC 60269‑2 and GB/T 13539.2 standards, rated AC 500V/690V. Breaking capacity reaches 100kA at 500V and 50kA at 690V, current range covers 315‑800A. Standard plug‑in knife‑blade design fits all NH3 series fuse bases for fast replacement. Widely used in low‑voltage power cabinets, distribution switchboards and heavy‑duty industrial power systems.
Date sheet
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:
- Replaceable for Mersen NH3 gG series with identical voltage, breaking capacity and dimension, directly compatible with original fuse base;
- Interchangeable with Eaton NH3 series, same gG utilization category and universal plug‑in structure;
- Direct substitute for Littelfuse NH3‑Style knife‑blade fuse, identical electrical parameters and physical dimension for seamless retrofit;
- Replacement for Siemens 3NA3 series, fits existing switchgear without mechanical alteration;
- Drop‑in alternative for Bussmann NHG3B 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。
| 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 of a fuse link | gG | GB 13539.1‑2015 GB/T 13539.2‑2015 |
| Power dissipation of a fuse‑link | 60W Max | Millivoltmeter |
| Breaking capacity of a fuse‑link | 500V: 100kA 690V: 50kA | Type test |
| Fuse‑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.
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