GFEVT500‑74E Series Square Body Fast‑Acting DC Fuse,500Vdc,500A‑1800A,Size 3#
GFEVT500‑74E square DC fuse,500Vdc,50‑kA breaking capacity,aR class for ESS & battery pack protection.UL248.13,IEC60269‑4 compliant.Request datasheet & quote
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GFEVT500‑74E series square‑body fast‑acting fuse links are engineered for heavy‑duty DC applications. This aR‑class semiconductor‑protection fuse delivers ultra‑fast current‑limiting performance for DC fault conditions, with time constant ≤5 ms. Rated 500 Vdc and covering current ratings from 500 A up to 1800 A in Size 3# package.
Two mechanical versions are available: suffix B‑74E for horizontal bolt‑on installation; suffix K‑74E for custom vertical fork‑bolt mounting to match different bus‑bar layouts. Low watt‑loss design minimizes heat generation under continuous load, high vibration resistance ≥20 g makes it suitable for harsh industrial and mobile energy‑storage environments.
GFEVT500‑74E 500Vdc 500‑1800A aR Fast‑Acting DC Fuse
Key Electrical Specifications
| Item | Specifications |
|---|---|
| Rated Voltage | 500 V DC |
| Rated Current | 500 A‑1800 A |
| Max Breaking Capacity | 50 kA @500 Vdc |
| Minimum Breaking Current | ≥5×In (5In) |
| Time Constant | ≤5 ms |
| Class | aR (Semiconductor / DC fast‑acting protection) |
| Size | 3# Square body |
| Mounting | B‑74E:Horizontal bolt‑on; K‑74E:Custom vertical fork bolt |
| Standards | UL 248.1 / UL 248.13; IEC 60269‑1 / IEC 60269‑4 |
| Compliance | RoHS; REACH declaration available upon request |
| Recommended Continuous Current | ≤75 % of rated In |
Note: Models 1500A,1600A,1800A require pre‑confirmation with factory before order.
Main Features
- Excellent DC fault‑interruption performance: fast arc extinction for DC short‑circuit faults, protects battery modules and power semiconductors.
- Low power loss, improves overall system efficiency and reduces thermal stress.
- Superior cycling capability for frequent charge‑discharge surges in battery systems.
- High mechanical shock & vibration resistance (≥20 g acceleration), suitable for mobile and off‑grid equipment.
- Wide operating temperature range: normal operating‑5℃~40℃; allowable‑40℃~85℃. Derating required above 40℃.
- Two mounting configurations for flexible cabinet & bus‑bar layout design.
Typical Applications
- Energy Storage System (ESS) DC bus protection
- Main circuit short‑circuit protection for high‑voltage battery packs
- Backup short‑circuit protection for DC contactors & relays
- Heavy‑duty DC power supply & industrial DC‑link protection
Operating Conditions & Derating Guidance
- Ambient temperature: Derate rated current via Kt factor when ambient temperature exceeds 40℃. Below‑5℃ pre‑arcing time slightly extends.
- Altitude: Within 2000 m no correction needed. For enclosed cabinets above 2000 m: derate 2‑5 % per 1000 m increase. Open‑air installation normally ignores altitude influence. Insulation gaps shall comply with GB/T 16935.1.
- Conductor sizing: Select copper cable / bus‑bar cross‑section per datasheet; 1250‑1800 A recommended current density:1.0‑1.4 A/mm².
- Forced cooling: Higher air velocity increases allowable rated current, refer to Kv cooling curve.
- Installation: Mount horizontally, vertically or tilted. Avoid load‑time fuse replacement unless load‑break switch is applied.
Model List (Partial)
| Part No. | Rated Current | Mount Type | Power Loss(100% load,W) |
|---|---|---|---|
| GFEVT500‑500B‑74E | 500A | B‑74E Horizontal bolt | 95 |
| GFEVT500‑800B‑74E | 800A | B‑74E Horizontal bolt | 130 |
| GFEVT500‑1000B‑74E | 1000A | B‑74E Horizontal bolt | 145 |
| GFEVT500‑1250K‑74E | 1250A | K‑74E Custom vertical fork | 180 |
| GFEVT500‑1800K‑74E* | 1800A | K‑74E Custom vertical fork | 260 |
*Pre‑sales technical communication required for asterisk‑marked high‑current models.
Drawings & Characteristic Curves
- Mechanical dimension drawings for B‑version horizontal and K‑version vertical mounting.
- Time‑Current characteristic curve: current tolerance ±15 %. Minimum breaking current 5In.
- Derating curves: ambient‑temperature derating Kt, altitude correction Ka, forced‑air cooling Kv curve.
Ordering Information
- Suffix B‑74E: standard horizontal long bolt mounting.
- Suffix K‑74E: custom fork‑type vertical bolt mounting.
- REACH compliance document available on request. All units RoHS‑compliant.
- High‑current ratings (1500‑1800 A) require pre‑order technical confirmation.
Call‑to‑action: Download full datasheet, send inquiry for quotation & sample availability.
FAQ
What is the minimum breaking current of GFEVT500‑74E fuse?
Minimum breaking current ≥5 times rated current(5In), time constant ≤5 ms for fast DC fault‑clearing.
What is difference between suffix B‑74E and K‑74E?
B‑74E: standard horizontal long bolt‑on mounting; K‑74E custom vertical fork‑bolt mounting. Electrical performance remains identical.
Do I need to derate this fuse under high ambient temperature?
Derate operating current by Kt factor when ambient temperature higher than 40℃. Under‑5℃ pre‑arcing time slightly prolongs, no need to oversize fuse generally.
Can GFEVT500‑74E be used for lithium‑ion battery pack main‑circuit protection?
Yes,it is an aR‑class fast‑acting DC fuse specially designed for battery‑pack and energy‑storage short‑circuit protection. Recommended continuous operating current ≤75 % of fuse rated current.
What correction should apply for high‑altitude installation?
No correction below 2000 m. For enclosed cabinets at 2000‑4500 m, derate rated current 2‑5 % per 1000 m elevation. Insulation gaps should follow IEC / GB/T 16935.1.
