XRNT5-15.5 Magne X Interrupter

Scope of Delivery The magne X interrupter Installation Instruction Sheet Quality Certificate

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I. Product Overview

The XRNT5-15.5 Magne X Interrupter is a current-limiting backup protection fuse specifically designed for 15kV (10kV level) medium-voltage power distribution systems . It adopts a high-strength epoxy fiberglass tube and current-limiting fuse structure, which can quickly interrupt the fault current when a transformer or line experiences a serious short-circuit fault. As a backup protection device for the main protection, it is widely used in American-style box-type substations, ring main units, box-type substations and other power distribution equipment. It is a key component in medium-voltage power distribution systems to improve the fault protection level of equipment.

II. Product Characteristics

1. Electrical and protective performance

Excellent current limiting characteristics : It adopts a high-performance current limiting fuse, which can cut off the current within half a cycle during a short circuit, effectively limiting the peak fault current and reducing the impact of the fault on the transformer and line. The breaking capacity can reach 31.5/40kA.
Backup protection function : As a backup protection device for the main protection, it can quickly cut off the severe short-circuit fault current when the main protection fails, prevent the fault from expanding, and protect the equipment safety.
Reliable insulation performance : The fuse tube is made of high-strength epoxy glass fiber material, which has excellent insulation performance and can withstand the rated voltage of 15.5kV system and short-time overvoltage. It has high insulation strength and no risk of breakdown or flashover.
Current-limiting arc extinguishing design : Built-in quartz sand arc extinguishing medium can quickly extinguish the electric arc, prevent the arc from reigniting, and improve the reliability of disconnection.

2. Structural and Safety Features

High-strength integrated design : The epoxy fiberglass tube is integrally molded with copper-plated tin end caps at both ends, which has high mechanical strength, is impact-resistant and vibration-resistant, and can withstand mechanical stress during breakage without the risk of deformation or breakage.
Standardized interface design : Adapts to standard fuse holder interfaces, making installation convenient and replacements can be done without power outages, greatly improving operation and maintenance efficiency.
Anti-misinstallation design : The interface size is standardized and can only be matched with the corresponding fuse holder, eliminating the risk of misinstallation; it has a built-in positioning structure to prevent loosening and falling off after installation.
Clear fuse indication : The built-in fuse indicator can intuitively display the fault status after the fuse blows, making it easy for maintenance personnel to quickly troubleshoot the fault.

3. Environmental and Weather Resistance

Strong wide temperature adaptability : It can adapt to a wide temperature range of -40℃ to +90℃. The performance of the fuse and insulation material does not degrade under high and low temperatures, and there is no risk of cracking or embrittlement. It is suitable for various outdoor and indoor scenarios.
Excellent moisture and dirt resistance : The fully sealed structure of the fuse tube is moisture-proof, waterproof, dirt-proof, and salt spray-proof. It can operate stably for a long time in harsh environments such as underground, humid, and dusty environments, and is not afraid of rain or condensation.
Long service life : Anti-aging, anti-ultraviolet, and resistant to ozone corrosion. Under normal working conditions, the service life can reach more than 10 years. The fuse is easy to replace, reducing the later maintenance cost.

III. Technical Parameters

Parameter categories	project	Technical indicators
Rated electrical parameters	Applicable system voltage (Un)	10kV
	Rated voltage (Ue)	15.5kV
	Rated current (Ie)	5~100A (Multiple specifications available, such as 5A, 10A, 20A, 50A, etc.)
	Rated frequency (fn)	50Hz/60Hz
	Power frequency withstand voltage	42kV/5min (dry test), no breakdown, no flashover
	Lightning impulse withstand voltage	95kV (peak value), no breakdown, no flashover
	Rated short-circuit breaking current	31.5kA/40kA (optional)
	Current limiting characteristics	Short-circuit current limiting factor ≤ 0.2
	Protective features	Current limiting backup protection, adapted to severe short-circuit faults
Structural and material parameters	Main material	Epoxy fiberglass (fuse tube), high-performance alloy (fuse element), tin-plated copper (end cap), quartz sand (arc extinguishing medium)
	Fuse holder adapter	Standard 15.5kV current-limiting fuse holder
Environmental parameters	Applicable altitude	≤2000m (Customization available for high altitudes)
	Ambient temperature	-40℃/ +90℃ (operating temperature), -40℃/ +70℃ (storage temperature)
	relative humidity	≤100% (no condensation)
	Seismic resistance level	Level 8
Implementation Standards		IEEE C37.42, GB/T 15166, GB/T 11022, DL/T 640

IV. Scope of Application

Applicable voltage level : 10kV AC medium voltage power distribution system, compatible with American-style prefabricated substations and ring main units with a maximum operating voltage of 17.5kV.
Applicable equipment scenarios :
The transformer backup protection for 15kV American-style box-type substations and ring main units serves as a backup device for the main protection, cutting off the current of severe short-circuit faults.
American-style box-type transformer substations for urban power distribution networks, power distribution systems for industrial and mining enterprises, and American-style power distribution equipment for new energy (photovoltaic/wind power) step-up substations;
Backup overcurrent protection for American-style power distribution equipment in various scenarios such as indoor/outdoor power distribution rooms, underground utility tunnels, and cable tunnels.
Function and Application : Limits severe short-circuit fault current in power distribution systems, serves as a backup protection device for main protection, prevents fault escalation, protects transformers and lines from overcurrent damage, and provides insulation isolation, offering a safe and reliable backup overcurrent protection solution for American medium-voltage power distribution systems.

V. Usage Conditions

1. Normal operating conditions

Altitude: ≤2000m;
Ambient temperature: -40℃~+90℃; equipment operating temperature complies with relevant standards.
Relative humidity: ≤100% (no condensation);
Environmental conditions: No corrosive gases, no flammable or explosive media, no severe vibration or impact;
Installation method: It is compatible with standard fuse holder interfaces and can be installed horizontally or vertically. The installation space must meet the operation requirements.

2. Special usage conditions (customization required)

The altitude exceeds 2000m;
The ambient temperature exceeds the range of -40℃ to +90℃;
Severely polluted, salt spray, and chemically corrosive environments;
High vibration and high impact conditions;
Non-standard fuse holder interface specifications;
Special current ratings and breaking capacity requirements.

VI. Installation and Maintenance

1. Installation Requirements

Before installation, inspect the product appearance for cracks, damage, bubbles, and undamaged insulation surfaces; check that the fuses are intact and free of rust, and that the fuse indicator is functioning properly.
Clean the fuse holder interface surface to remove oil, dust, and foreign objects, ensuring the interface is dry and clean.
Slowly push the fuse into the fuse holder interface to ensure it is in place and lock the positioning structure.
After installation, check that the fuse is securely installed, without looseness or tilting, and that the interface is reliably sealed.

2. Maintenance Requirements

Regularly inspect the appearance of the fuses; ensure they are free of cracks, discharge marks, and dirt, and that they are securely installed without any looseness.
Regularly check the status of the fuse indicator. If the indicator pops up, it means that the fuse has blown and you need to replace it with a fuse of the same specification immediately.
Clean the fuse surface to remove dust and dirt, and keep the insulation surface dry and clean to avoid corrosion from oil and chemicals.
After a fuse blows, it must be replaced with a current-limiting backup protection fuse of the same specification. It is strictly forbidden to use fuses of different specifications or to directly short-circuit them, otherwise the protection will fail and cause a safety accident.
Special insulated tools must be used to insert or remove fuses. It is strictly forbidden to operate live fuses with bare hands. Power distribution safety regulations must be strictly followed during operation.

VII. Precautions

The product must be installed, debugged, and maintained by professional electrical personnel with medium-voltage power distribution construction qualifications. Operation by non-professional personnel is strictly prohibited.
The product must be used with the corresponding fuse holder. It is strictly forbidden to use fuses of different voltage or current ratings, otherwise it will lead to protection failure and safety accidents.
Fuse must not be disassembled or modified without authorization, otherwise the warranty and safety guarantee will be lost. It is strictly forbidden to use non-special tools to forcibly install or remove it.
After a fuse blows, it must be replaced with a current-limiting backup protection fuse of the same specification. It is strictly forbidden to use a substitute fuse or short-circuit it, otherwise it will lead to serious consequences such as equipment damage and fire.
When storing, it should be placed in a dry, ventilated, and cool environment, avoiding direct sunlight, high temperature, humidity, and compression. It is strictly forbidden to contact with sharp objects that may damage the insulation layer.
When plugging or unplugging fuses while they are energized, it is essential to strictly adhere to power distribution safety regulations, take appropriate safety precautions, and strictly prohibit any unauthorized operations.

VIII. Model Description

Model Identification	meaning
XRNT5	Current-limiting backup protection fuse series code
□	Rated current rating (e.g., 5/10/20/50/100A, etc.)
15.5	Applicable system rated voltage level: 15.5kV
Magne X Interrupter	Current-limiting backup protection fuse, compatible with American-style transformer substation fuse holders

IX. Implementation Standards and Certification

International Standard: IEEE C37.42 “High Voltage Fuse Standard”;
National standards: GB/T 15166 “AC High Voltage Fuses”, GB/T 11022 “Common Technical Requirements for Standards on High Voltage Switchgear and Controlgear”, DL/T 640 “High Voltage AC Drop-out Fuses”;
The product has passed the type test of the National High Voltage Electrical Apparatus Quality Supervision and Inspection Center and meets national electrical safety standards.

X. After-sales service

Product warranty period: 18 months from the date of manufacture, or 12 months from the date of commissioning (whichever comes first).
During the warranty period, products will be repaired or replaced free of charge if quality issues arise.
We provide technical support, installation guidance, and customized services (adaptation to special current ratings and operating conditions).

Document Description

The technical parameters in this manual are based on standard operating conditions. Special operating conditions need to be customized according to actual needs. The final specifications shall be subject to the product technical agreement and type test report.