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GRL GRUOP > Fuse > Semiconductor Fuse Link > GRL PV Fuse DNR Series 4A 400A Battery Fuse Link Supplie

GRL PV Fuse DNR Series 4A 400A Battery Fuse Link Supplie

Rated Voltage： AC 690 V / DC 500 V

Rated Current：4 A – 400 A

Interrupt Capacity： AC 100 kA / DC 50 kA

Operating Temperature：–40 °C to +80 °C

Protection Class：aR

Mounting Bolted ：M5, M6, or M10 screws

Recommended Torque ：M5: 4 N·m (DNR10 models)

M6: 8 N·m (DNR18 models)

M10: 21 N·m (DNR30/DNR38 models)

Flame Rating ：UL94 V-0 (self-extinguishing)

Certifications： CCC

Standards： IEC 60269-4, GB/T 13539.4

Description

Description

The DNR PV fuse is a high-performance fuse engineered for DC protection in solar and energy storage applications. These bolt-mount fuses (class aR for semiconductor protection) are rated for up to AC 690V / DC 500V and currents from a few amps to 400A, making them ideal for protecting inverters, converters, battery systems, and other power electronics.

They provide fast short-circuit and backup protection for sensitive semiconductor devices in renewable energy systems – for example, frequency converters, rectifiers, inverters, and various power supplies – and batteries, motors, capacitors, and wiring. This means the DNR fuse can handle faults in on-grid or off-grid PV arrays, battery storage banks, EV drive systems, and motor drives.

All DNR fuses are designed to meet stringent safety standards (GB/T 13539.4 and IEC 60269-4 for semiconductors ) and carry CCC certification.

pv-fuse-link

Technical Parameter

Specification	Details
Rated Voltage	AC 690 V / DC 500 V
Rated Current	4 A – 400 A (series models cover this range)
Interrupt Capacity	AC 100 kA / DC 50 kA
Time Constant (DC)	10–15 ms at 50 kA (L/R ≤ 15 ms)
Operating Temperature	–40 °C to +80 °C
Humidity (non-cond.)	≤50% at 40 °C; ≤90% at 20 °C (non-condensing)
Protection Class	aR (for semiconductor devices)
Mounting	Bolted (M5, M6, or M10 screws)
Recommended Torque	M5: 4 N·m (DNR10 models)
	M6: 8 N·m (DNR18 models)
	M10: 21 N·m (DNR30/DNR38 models)
Flame Rating	UL94 V-0 (self-extinguishing)
Certifications	CCC
Standards	IEC 60269-4, GB/T 13539.4

Structure and Feature

PV Fuse Key Features

High Interrupting Capacity: AC 100 kA, DC 50 kA (time constant ≤15 ms), ensuring effective protection against extreme DC fault currents.

Wide Temperature Range: Operates from –40 °C to +80 °C, with stable performance in harsh environments.

Flame-Retardant Construction: Housing and insulators are rated UL94 V-0 for fire safety.

Compact, Bolt-Mount Design: Available in 10 mm, 18 mm, 30 mm, and 38 mm length tubes, all with ceramic bodies. Easy M5/M6/M10 bolted installation.

Low Power Loss: Optimized current-limiting element minimizes voltage drop; e.g., only ~10–15 W power loss at rated currents.

Compliance & Certification: Meets IEC 60269-4 (semiconductor protection) and GB/T 13539.4 standards, with the CCC quality mark.

PV Fuse Benefits

Enhanced DC Fault Protection: Extremely high interrupting rating (AC 100 kA / DC 50 kA) quickly clears short circuits, preventing cascade failures.

High Reliability: aR (semiconductor) rating means the fuse will survive everyday currents and only melt under true fault conditions, making it ideal for sensitive electronics.

Compact Design: Ceramic tube construction and bolt-mount form factor save panel space compared to larger fuses, while still delivering high performance.

Long Service Life: Robust materials and stable thermal design ensure a long lifetime even under frequent high-current operations.

Standards-Compliant: Compliant with IEC 60269-4 and UL protocols for PV/semiconductor fuses, giving confidence in global installations.

All these features combine to make the DNR series an excellent PV fuse / solar fuse solution for modern photovoltaic and DC systems.

FAQ

1. What installation torque is required?

Use the specified bolt size and torque for each fuse frame: for the small DNR10 models (4–32 A) use M5 bolts torqued to ~4 N·m; for DNR18 (10–100 A) use M6 at ~8 N·m; for larger DNR30/38 (80–400 A) use M10 at ~21 N·m. Proper torque ensures reliable contact.

2. Is this fuse compatible with my PV inverter or battery system?

Yes. The DNR semiconductor fuse link is designed as a DC protection fuse for PV and energy storage inverters up to 500 VDC. It’s aR rating, and compliance with IEC/GB standards means it can be used in virtually any DC circuit requiring semiconductor protection. Simply choose a model with the appropriate voltage and current rating.

3. Can I use DNR fuses in off-grid and on-grid solar systems?

Absolutely. These fuses protect the DC side of any PV installation, whether off-grid or grid-tied. They are also ideal for battery backup (off-grid) or grid-interactive (on-grid) inverters. The high interrupt capacity and wide temperature tolerance make them suitable for renewable energy applications.

4. What do the IEC 60269-4 and GB/T 13539.4 standards mean?

These are international and Chinese standards for fuses protecting semiconductor devices. Meeting these standards (as the DNR series does) guarantees that the fuse has been tested for safe, fast interruption of fault currents in sensitive DC circuits.

By following these guidelines and choosing the proper DNR model, installers ensure safe, reliable protection for photovoltaic and energy storage systems with the added benefits of high reliability and compact size.

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