Description
7H38L High Speed DC Automotive Fuse – 300A–400A 750V/800V
Overview of 7H38L High Speed DC Automotive Fuse
With current specification 300A to 400A and dual voltage rating 750V DC & 800V DC, it delivers ultra-fast short-circuit breaking capability, perfectly matching high-voltage EV main power loop protection demands.
Product Specifications
- Model: 7H38L
- Current Rating: 300A, 350A, 400A
- Rated Voltage: 750V DC, 800V DC
- Performance: High Speed / Fast Acting
- Use Scene: High voltage new energy automotive DC system
- Feature: High breaking capacity, automotive anti-vibration grade
- Standard: IEC & UL international automotive fuse certification
Core Advantages
- Adapt 750V/800V high-voltage new energy platform
- 300A-400A high current, for vehicle main circuit protection
- High-speed fusing, avoid high-voltage component breakdown
- Automotive grade anti-shock, anti-vibration, adapt driving vibration
- High temperature resistance, long continuous working life
Application Scenarios
- 800V high voltage platform electric vehicles
- New energy vehicle main high-power DC circuit
- Large energy storage high voltage DC distribution system
- Commercial electric vehicles and heavy-duty new energy equipment
- 750V/800V industrial high-voltage DC power system
FAQ
A: 7H38L is high speed DC automotive fuse, designed for 300A-400A, 750V/800V high voltage new energy vehicle protection.
A: Yes, 7H38L is specially customized for 750V and 800V high-voltage electric vehicle systems.
Full Product Description
Key Features
- Current Range: 300A – 400A
- Voltage Rating: 750V DC / 800V DC
- aR high‑speed fast‑acting type
- Excellent current‑limiting & low I²T
- High breaking capacity & stable protection
- High‑strength flame‑retardant ceramic body
- High conductivity, low power loss
- Bolt‑down mounting for firm connection
- Anti‑vibration & shock resistance for automotive use
- Wide operating temperature range
- RoHS compliant
Applications
- Electric vehicle (EV) power battery systems
- High‑voltage power distribution unit (PDU)
- Motor controller & inverter
- EV DC/DC converter
- Automotive high‑voltage distribution circuits
- New energy vehicle electrical systems
- Automotive power electronic equipment
Why Choose EssFuse?
7H38L High Speed DC Automotive Fuse 300A–400A 750V/800V
This series fuse is applicable to the rated DC voltage of 800V (750V) below, in the rated current of 300A–400A line. The breaking capacity is 20KA, widely used in the charger, charging pile, vehicle-mounted battery, vehicle-mounted circuit system and integrated protection of inverter. It has characteristics such as strong current limiting capacity, large breaking capacity, fast short circuit breaking speed, and resistance to temperature shock, mechanical vibration, current shock, and chemical load. This series complies with ISO 8820, JASO D622, GB/T31465, GB/T31465.6, ISO 8820-8, and UL248-20 standards.
2. Normal working conditions
Normal operating conditions of ambient air temperature: -5 ℃ ~ 40 ℃; allowable operating conditions: -40 ℃ ~ +125 ℃;
3. Use category
Full range fast fuse (gR)
4. Structural characteristics
The melting tube of the product is made of high-temperature resistant ceramic material, with high flame-retardant performance and strong hardness.
The melt is sealed in the melting tube with a variable cross-section melt made of 99.99% pure silver. The melting tube is filled with chemically treated high-purity quartz sand and specially treated chemical materials as arc extinguishing medium. The contact surface is silver plated to ensure reliable electrical performance, greatly reducing temperature rise and power consumption; both ends of the melt are firmly connected with the contact by spot welding, which greatly enhances the safety and reliability of breaking short circuit fault current.
5. Agreed current and agreed time
| Test Current (A) | Fusing Time (s) | |
|---|---|---|
| In ≥ 60A | ||
| Min | Max | |
| 1.1In | 14400 | – |
| 1.35In | 150 | 3600 |
| 1.5In | 20 | 1500 |
| 2In | 1 | 300 |
| 3In | 0.2 | 30 |
| 5In | 0.05 | 1 |
Note: the agreed current and agreed time required by the customer can be negotiated with our company.
The characteristics of fuse will vary according to the use environment and surrounding design requirements.