7H38L Fast‑acting DC Fuse 300‑400A 800VDC 20kA
7H38L gR fast‑acting fuse DC800V/750V,300‑400A,20kA breaking capacity. ISO8820 JASO D622 UL248‑20 for EV charging pile, vehicle‑mounted battery & inverter. Request datasheet & quotation.
Get a Quote
7H38L Series Fast‑acting DC Fuse (gR Class) 300A‑400A, 800VDC 20kA
7H38L series is full‑range gR fast‑acting bolt‑on DC fuse for high‑power DC circuits up to DC 800V(750V). Rated current covers 300A‑400A with 20kA rated breaking capacity. It delivers reliable overload and short‑circuit protection for EV chargers, charging piles, vehicle‑mounted battery packs, onboard high‑voltage circuits and power inverters.
Manufactured by Dongguan GongFu Electronics , this high‑current ceramic fuse provides strong current‑limiting performance, ultra‑fast short‑circuit interruption. It can resist thermal shock, mechanical vibration, current impulse and chemical load for harsh new‑energy equipment environments.
Key Features & Construction
- High‑temperature resistant ceramic fuse tube: Excellent flame retardancy and mechanical hardness for EV harsh working conditions.
- 99.99% pure silver variable‑section melt: Hermetically sealed inside fuse body for stable fusing performance.
- Chemically‑treated high‑purity quartz‑sand arc‑extinguishing filler: Superior DC arc quenching capability.
- Silver‑plated contact surfaces: Minimize temperature rise and power consumption for stable electrical contact.
- Spot‑welded melt‑to‑terminal connection: Reinforced joint improves safety & reliability during short‑circuit fault breaking.
- Operating temperature: Normal ambient‑5℃ ~40℃; allowable extreme operating ‑40℃ ~ +125℃.
- Utilization category: gR full‑range fast fuse.
Main Technical Specifications
| Model | Rated Current(A) | DC Rated Voltage(V) | Max Voltage Drop(mV) | Breaking Capacity(KA) |
|---|---|---|---|---|
| 7H38L300 | 300 | 800V/750V | 45 | 20 |
| 7H38L350 | 350 | 800V/750V | 42 | 20 |
| 7H38L400 | 400 | 800V/750V | 42 | 20 |
Rated Current & Fusing Time Characteristics
Test condition: 25℃ constant ambient temperature. Custom fusing‑time characteristics can be negotiated. Actual fuse performance changes with operating environment and system design.
| Test Current | Fusing Time Min(s) | Fusing Time Max(s) |
|---|---|---|
| 1.1In | 14400 | ‑ |
| 1.35In | 150 | 3600 |
| 1.5In | 20 | 1500 |
| 2In | 1 | 300 |
| 3In | 0.2 | 30 |
| 5In | 0.05 | 1 |
Mechanical Dimensions（Bolt‑on Installation）
- Outer diameter：Φ38±0.2 mm
- Terminal mounting hole：25±0.2 mm；hole‑center distance：80.6±0.5 mm
- Overall total length：102±0.5 mm
- Terminal thickness：4±0.2 mm
Compliance & Standards
7H38L series complies with international & Chinese automotive‑grade fuse standards:
- ISO 8820
- JASO D622
- GB/T 31465
- Environmental reliability: GB/T31465.6, ISO8820‑8, JASO D622, UL248‑20
Frequently Asked Questions
1: What does gR utilization category stand for for 7H38L fuse?
gR is full‑range fast‑acting fuse category, providing both overload and short‑circuit protection for high‑power DC circuits and power semiconductor devices.
2: What is the operating temperature range for 7H38L series?
Normal working ambient temperature:‑5℃~40℃; allowable extreme operating temperature:‑40℃~+125℃. High ambient temperature will affect actual fusing performance.
3: Can I get custom fusing characteristics for my project?
Yes, custom agreed‑current & fusing‑time requirements can be discussed with our engineering department.
4: What is breaking capacity rating of EssFuse 7H38L?
Rated breaking capacity is 20 kA @ DC 800V/750V.
