GFEVF750 Series DC Power Fuse 750VDC 35‑800A aR
North‑American‑style aR DC power fuse GFEVF750 Series,750VDC 35‑800A,50kA breaking capacity. For battery pack,ESS & DC drives. CE RoHS compliant
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GFEVF750‑Series North‑American‑Style DC Power Fuse,700/750VDC 35A‑800A Class aR
The GFEVF750 series is a DC fuse designed as a North-American-style aR power fuse for battery pack and ESS DC drives. This fuse supports 750VDC at 35-800A with 50kA breaking capacity.
,GFEVF750‑Series DC Power Fuse is high‑performance bolt‑on aR‑class fast‑acting fuse exclusively engineered for 700‑750Vdc DC‑system fault‑current protection. Rated for 750 Vdc with 35 A‑800 A current range and up to 50 kA rated breaking capacity (Time Constant:2.5±0.5 ms). This north‑american‑style cylindrical fuse delivers low arc‑voltage, low I²t energy let‑through and low watt‑loss, ideal for ESS energy‑storage, battery‑pack, DC‑drives and reduced‑voltage‑starter circuits. CE certified and RoHS‑compliant, designed to meet UL248.13 and IEC 60269.4 standards.
📄 Download Full Datasheet PDF GFEVF750-Series.-35-800A-750Vdc2
Key Features & Benefits
- ✅ Specially designed for pure DC‑application with excellent DC short‑circuit interrupting performance
- ✅ Rated Breaking Capacity: 50 kA @750 Vdc (Time Constant 2.5±0.5 ms), operation class aR for semiconductor/battery DC‑protection
- ✅ Low arc‑voltage & low energy let‑through (I²t), minimizing stress on protected power‑electronic components
- ✅ Low watt‑loss, reducing continuous‑operation heating and overall system energy waste
- ✅ Superior cycling capability, stable performance under repeated heavy‑load fluctuation
- ✅ Can be applied in parallel configuration for higher total ampacity (follow official sizing guidelines)
- ✅ Outstanding mechanical vibration & shock resistance, suitable for harsh industrial & mobile environments
- ✅ Wide ambient‑temperature tolerance and strong anti‑current‑impingement capacity
- ✅ CE approval, RoHS compliant; reference standards UL248.13 / IEC 60269‑4
Typical Applications
GFEVF750 series DC fuses are widely deployed for over‑current & short‑circuit protection for high‑voltage DC industrial and energy‑storage equipment:
- 🔋 Electrical Energy‑Storage (ESS / Battery Energy‑Storage System)
- 🔋 Industrial 750V battery pack over‑current & short‑circuit protection
- ⚡ DC‑Drives motor system protection
- ⚡ Reduced‑voltage starters equipment protection
- ⚡ Power converters & rectifier equipment protection
- ⚡ Backup protection for DC relay contacts
Main Electrical Ratings
| Rated Voltage | 700Vdc / 750Vdc (max) |
| Rated Current Range | 35 A ~ 800 A |
| Rated Breaking Capacity | 50 kA @750 Vdc or lower |
| Time‑Constant Test Condition | 2.5 ± 0.5 ms |
| Operation Class | aR (semiconductor / DC fast‑acting protection) |
| Standards Reference | UL248.13, IEC 60269‑4 |
| Certifications | CE, RoHS Compliant |
Part Number & Case Diameter Overview
Part Number rule: GFEVF750‑XXA‑YYR; XX‑rated current; YY‑case diameter(20R /26R /38R /51R)
- 20 mm case(20R):35A‑60A
- 26 mm case(26R):70A‑150A
- 38 mm case(38R):125A‑400A
- 51 mm case(51R):225A‑800A
Mechanical Dimensions
All dimension unit in mm. Tolerance refer to official datasheet drawing.
| Case Code | Current Range | A±1.5 | B±1 | C±1 | D±1.5 | E±0.5 | F±0.5 | H±0.5 | G±0.5 |
|---|---|---|---|---|---|---|---|---|---|
| 20R | 35‑60A | 111.00 | 20.00 | 70.00 | 90.50 | 8.50 | 15.00 | 3.00 | 13.0 |
| 26R | 70‑150A | 114.00 | 26.00 | 66.00 | 90.00 | 8.50 | 20.00 | 3.00 | 12.0 |
| 38R | 125‑400A | 129.00 | 38.00 | 72.00 | 100.50 | 10.50 | 25.00 | 6.00 | 20.0 |
| 51R | 225‑800A | 129.00 | 51.00 | 72.00 | 100.50 | 10.50 | 40.00 | 6.00 | 20.0 |
Operating Conditions & Derating Rules
Temperature Condition
- Normal operating ambient temperature:‑5 ℃ ~ +40 ℃
- Allowable operating range:‑40 ℃ ~ +85 ℃
- Storage temperature:‑40 ℃ ~120 ℃
- Note: Recommended continuous working current ≤75% of fuse rated‑current. Above 40℃ ambient temperature requires current‑derating according to derating‑curve chart in datasheet.
Altitude Derating(Ka factor)
- Standard condition: altitude ≤2000 m without derating.
- Closed‑box installation above 2000 m: derate rated‑current 2‑5% per 1000 m elevation.
- Open‑air installation: altitude thermal impact can generally be ignored.
- Insulation gap correction should follow GB/T16935.1 for high‑altitude enclosed cabinet application.
Installation & Vibration Resistance
- Supports vertical, horizontal or inclined mounting orientation.
- High‑frequency vibration resistance ≥20g acceleration.
- Forced air‑cooling can raise allowable operating‑current; refer to Kv cooling‑correction curve in datasheet.
- Terminal contact resistance must remain low to avoid extra temperature‑rise.
Characteristic Curves Reference
- Time‑Current Pre‑arcing curve (35‑200A /225‑800A)
- Instantaneous peak let‑through cut‑off curve
- Temperature derating coefficient curve
- Altitude derating coefficient curve
- Forced‑air cooling correction Kv curve
Full melting I²t, clearing I²t table and all graphic curves are included inside downloadable PDF datasheet.
FAQ — Technical & Commercial Questions
1: What does aR‑class stand for for GFEVF750 DC fuse?
A: aR is semiconductor‑protection class for high‑speed DC fuses, designed for fast short‑circuit fault‑clearing for high‑voltage battery and power‑electronic DC‑circuits, not general‑purpose gG cable‑protection fuse.
2: Is current derating required above 40℃ ambient temperature?
A: Yes. When ambient temperature higher than +40℃, derate fuse operating‑current follow the temperature‑derating graph inside datasheet. Recommended continuous load no higher than 75% nominal rating under normal environment.
3: Can multiple GFEVF750 fuses work in parallel for higher ampacity?
A: Yes, parallel‑installation is allowed to achieve higher total current capacity. You must strictly follow manufacturer sizing guidelines to guarantee balanced current‑sharing for parallel‑connected fuses.
4: Under what test condition is 50kA breaking‑capacity rated?
A: Breaking‑capacity rating 50kA@750Vdc is validated with DC‑circuit L/R time‑constant 2.5±0.5 ms.
5: Can I get engineering samples and full datasheet?
A: Yes, submit inquiry form to request engineering‑samples, datasheet PDF, dimension drawings or customized technical support.
Request Quotation / Technical Support
Please provide target part‑number, required quantity, real‑world application condition(voltage, working‑current, ambient‑temperature, altitude). Our application engineer will reply you within 24 working hours.
