GFBFG4‑D‑105E Series 1500Vdc Fast‑Acting Fuse
GFBFG4‑D‑105E Size4# 1500Vdc aR DC fuse, 400–2000A, ultra-high 250kA interrupt rating (L/R ≤5ms), 4×M10 bolt terminals for utility-scale BESS & wind power protection.
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GFBFG4‑D‑105E‑Series 1500Vdc Fast‑Acting Square‑Body DC Fuse (400A‑2000A, Size4#, aR Class, ESS Fuse)
The GFBFG4-D-105E Size4# is a DC fuse designed as a 1500Vdc aR fast-acting fuse for utility-scale BESS wind power protection. This fuse supports 400-2000A with ultra-high 250kA interrupt rating at L/R ≤5ms.
,The GFBFG4‑D‑105E‑Series is Size4# heavy‑duty bolt‑connected square‑body fast‑acting DC fuse manufactured by GFEFUSE. Rated for 1500Vdc, this series delivers current coverage from 400A up to 2000A. Compared with conventional high‑power DC fuses, it achieves an ultra‑high interrupting capacity of 250kA@1500Vdc under L/R ≤5 ms, with minimum breaking‑current ≥5In. Specifically, it is designed as partial‑range aR‑type protection fuse for industrial‑grade energy‑storage and wind‑power equipment. In addition, note that the 2000A variant belongs to special‑order model and needs pre‑sales technical communication.
Key Features & Benefits
First of all, this high interrupting fuse is built for severe short-circuit conditions in utility-scale energy storage. Its core advantages are listed below:
- ✅ Rated voltage 1500Vdc, heavy‑duty Size4# square‑body bolt‑connected mechanical structure
- ✅ Fast‑acting aR‑class partial‑range protection; ultra‑high interrupt rating 250kA@1500Vdc (L/R ≤5 ms), minimum breaking‑current ≥5In
- ✅ 4‑M10 bolt‑mount holes; max hole depth12.5mm, min thread‑length10mm; tin‑plated terminal surface (3‑5μm)
- ✅ Broad high‑current portfolio:400A‑2000A; 2000A marked‑asterisk model requires special‑order technical review
- ✅ Low watt‑loss property reduces excessive heat build‑up inside large‑scale energy‑storage cabinets
- ✅ Superior mechanical shock & vibration resistance ≥20g acceleration
- ✅ Optimized for industrial‑grade ESS, wind‑power system, heavy‑duty DC short‑circuit backup scenarios
- ✅ UL248‑13 referenced, CE & RoHS compliant; REACH documentation available upon buyer request
Main Electrical Ratings
Below is the consolidated electrical specification table. Meanwhile, all test parameters are performed at 250kA /1500Vdc conditions.
| Rated Voltage | 1500 Vdc |
| Rated Current Range | 400A‑2000A (Size4#) |
| Operating Class | aR (partial‑range semiconductor / energy‑storage short‑circuit protection) |
| Rated Breaking Capacity | 250 kA @1500Vdc, L/R ≤5 ms |
| Minimum Breaking Current | ≥5.0 × In |
| Test I²t Condition | 250 kA @1500Vdc |
| Time‑Current Curve Tolerance | ±15% current‑direction error |
| Recommended Continuous Current | ≤75% of nominal fuse rating |
| Terminal Mounting | 4pcs M10 bolt‑holes; max hole depth12.5mm, min thread‑length 10mm; tin‑plated 3‑5μm |
Complete Part‑Number Ratings Table
Note：Models marked with * symbol are subject to special‑order technical communication before order placement. Furthermore, I²t values are critical for coordination with DC contactors.
| Part No. | Fuse Amps | Breaking Capacity | A²s Melting @250kA/1500Vdc | A²t Clearing @250kA/1500Vdc | 100% Power Loss(W) | Remarks |
|---|---|---|---|---|---|---|
| GFBFG4‑400D‑105E | 400A | 250kA | 42,500 | 267,800 | 165 | Standard |
| GFBFG4‑500D‑105E | 500A | 250kA | 93,700 | 593,500 | 172 | Standard |
| GFBFG4‑630D‑105E | 630A | 250kA | 165,000 | 1,060,000 | 184 | Standard |
| GFBFG4‑700D‑105E | 700A | 250kA | 223,500 | 1,420,000 | 190 | Standard |
| GFBFG4‑800D‑105E | 800A | 250kA | 317,000 | 2,010,000 | 194 | Standard |
| GFBFG4‑900D‑105E | 900A | 250kA | 443,000 | 2,800,500 | 203 | Standard |
| GFBFG4‑1000D‑105E | 1000A | 250kA | 665,000 | 4,190,000 | 210 | Standard |
| GFBFG4‑1100D‑105E | 1100A | 250kA | 795,600 | 5,050,400 | 220 | Standard |
| GFBFG4‑1200D‑105E | 1200A | 250kA | 954,000 | 6,065,670 | 243 | Standard |
| GFBFG4‑1250D‑105E | 1250A | 250kA | 1,154,000 | 7,250,780 | 255 | Standard |
| GFBFG4‑1300D‑105E | 1300A | 250kA | 1,331,000 | 8,520,500 | 261 | Standard |
| GFBFG4‑1350D‑105E | 1350A | 250kA | 1,450,000 | 9,140,800 | 268 | Standard |
| GFBFG4‑1400D‑105E | 1400A | 250kA | 1,765,000 | 11,200,500 | 273 | Standard |
| GFBFG4‑1500D‑105E | 1500A | 250kA | 1,934,000 | 12,175,530 | 280 | Standard |
| GFBFG4‑1600D‑105E | 1600A | 250kA | 2,435,000 | 15,580,500 | 291 | Standard |
| GFBFG4‑1800D‑105E | 1800A | 250kA | 3,045,000 | 19,200,700 | 310 | Standard |
| *GFBFG4‑2000D‑105E | 2000A | 250kA | 4,050,000 | 25,820,000 | 348 | Special‑order |
Mechanical Dimensions（Size4#, 4‑M10 bolt‑connected）
All ratings share identical Size4# footprint. Therefore, busbar layout remains unchanged when switching different ampere sizes.
Insert WebP‑format dimension drawing for GFBFG4‑D‑105E.
Application Fields
Generally speaking, this high interrupting fuse is widely adopted in large renewable power plants. The main application scenarios are as follows:
- New‑Energy Industrial Scenarios ‑ Industrial‑grade Energy‑Storage System（BESS）DC‑side short‑circuit backup protection
- Wind‑power converter and wind‑farm power equipment over‑current & short‑circuit protection
- Heavy‑Duty Industrial DC Equipment ‑ Large‑capacity battery‑cluster short‑circuit protection
- Heavy‑current DC power cabinet & industrial DC converter partial‑range protection
For example, system integrators select this Size4# 250kA high‑interrupt fuse for main‑circuit protection of utility‑scale industrial energy‑storage power stations.
Standards & Approvals
First, this fuse references international industry specification UL 248‑13. REACH document release available upon formal customer request. In terms of performance, time‑current characteristic accuracy keeps ±15% current‑direction error.
Operating Conditions & Derating Rules
Storage Environment
Product storage temperature: ‑40℃~+120℃; package storage temperature:‑40℃~+80℃. Humidity limits: RH≤70%@40℃, RH≤80%@30℃, RH≤90%@20℃. Store in original carton, keep dust‑free warehouse environment.
Ambient‑Temperature Correction
Standard operating temperature ranges from ‑5℃ ~+40℃. Allowable working temperature covers ‑40℃ ~+85℃. Below ‑5℃, low‑overload pre‑arcing time will extend slightly.
Altitude Correction Ka
Normal installation altitude shall not exceed 2000 m. As altitude rises between 2000‑4500 m, air insulation strength reduces 12‑15% per 1000 m. Correction formula: Ka = 1‑(H‑2000)/100*(0.5/100).
Continuous‑Current Restriction
As an important installation note: long‑term operating current must stay ≤75% × nominal In.
Insert three charts: temperature‑derating Kt curve, altitude‑derating Ka curve, forced‑air‑cooling Kv curve.
Installation & Conductor Sizing Requirement
To ensure stable performance, follow the terminal fastening instructions carefully. Bolt‑Hole Terminal Fastening: Select proper high‑strength M10 bolts to fasten fuse terminals against bus‑bar. Stable low contact resistance must be guaranteed under ultra‑high heavy‑current working condition. Pay attention to tin‑plated contact surface protection, avoid scratching plating layer.
Frequently Asked Questions
1: What is breaking‑capacity & time‑constant of GFBFG4‑D‑105E series?
A: Rated breaking‑capacity 250kA @1500Vdc, time‑constant L/R ≤5 ms; minimum breaking‑current ≥5 times nominal rated current (5In).
2: What is the mounting terminal type for this fuse?
A: Bolt‑connected terminal with 4pcs M10 mounting holes; max hole depth 12.5mm, minimum thread length 10mm, tin‑plated contact surface 3‑5 microns.
3: Is 2000A a standard stock model?
A: No. GFBFG4‑2000D‑105E is special‑order item, please confirm technical requirements with factory before placing purchase orders.
4: What is recommended long‑term continuous operating current?
A: Continuous working current shall not exceed 75% of fuse nominal ampere rating.
5: Which standards and approvals does GFBFG4‑D‑105E comply with?
A: Reference UL248‑13, CE certified, RoHS compliant; REACH declaration available on customer request.
6: Is derating required for closed‑cabinet high‑altitude deployment?
A: Yes. For closed cabinets with internal temperature >40℃ above 2000 m altitude, derate rated‑current 2%‑5% per 1000 m elevation. Open‑air installation generally ignores altitude‑related derating.
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👉 GFBFG4‑D‑105E Series 1500Vdc DC Fuse 400‑2000A | EssFuse
Form fields suggestion: Required rated current, Note if need asterisk‑marked special‑order model, System DC voltage, Cabinet ambient temperature, Working altitude, Application scenario, Order quantity.
