NINGBO KEYONG JINGSHENG ELECTRICAL APPLIANCE CO., LTD. presents the KLD (V4) Fuse Design Automotive Relay, a compact high-current relay designed for 30A–60A switching applications in automotive and industrial systems.
It is widely used in car lighting, power circuits, lamp accessories, and heavy-duty control systems, ensuring stable and reliable performance under demanding conditions.
The KLD (V4) supports quick-connect and PCB mounting options, with an optional dustproof design for improved durability in harsh environments. Manufactured under ISO 9001 certified processes, it ensures consistent quality, long service life, and safe operation.
With its compact structure and versatile installation options, the Fuse Design Automotive Relay provides a cost-effective and reliable solution for high-current control applications.
The KEYONG Fuse Design Automotive Relay operates through a dual-function system:
The relay coil controls the switching of high-current circuits using a low-power signal.
The built-in fuse monitors the current load and automatically disconnects the circuit during overload or short-circuit conditions.
This integrated design ensures both precise electrical control and real-time circuit protection, improving safety and reliability in automotive applications.
1. Integrated Fuse Protection Design
Built-in fuse structure protects circuit from overcurrent and short-circuit damage
Reduces need for external fuse holders
Enhances system safety and simplifies installation
2. High Electrical Reliability
Stable switching performance under vibration and temperature changes
Low contact resistance for efficient current transmission
Long electrical and mechanical lifespan
3. Compact Automotive-Grade Structure
Space-saving design for modern vehicle wiring systems
Suitable for tight installation environments
Compatible with standard automotive sockets
4. Strong Environmental Adaptability
Resistant to heat, humidity, dust, and vibration
Designed for harsh automotive operating conditions
Stable performance in long-term continuous use
5. OEM & Custom Support
Custom coil voltage, pin layout, and fuse rating available
Suitable for automotive OEM projects and aftermarket replacement markets
Flexible manufacturing capability from China factory supply chain
| Contact arrangment | 1/2A,1/2B 1/2C |
| Voltage drop(at 10A) | ≤200mV |
| Contact material | Silver alloy:AgSnO₂ In₂O₃、AgSnO₂、AgNi |
| Contact rating | 30A/40A/60A 14VDC |
| Max switching voltage | See“Load limit curve” |
| Max switching current | 60A(Resistive 14VDC) |
| Min contact load | 1A 6VDC |
| Electrical endurance(Frequency:900 ops/h) | 1×10⁵ops |
| Mechanical endurance(Frequency:18000 ops/h) | 1×10⁷ops |
| Power consumption(W) | 1.6W | 1.8W | 1.6W | 1.8W | 1.8W | 2.0W |
| Nominal voltage(VDC) | 12 | 12 | 24 | 24 | 24 | 24 |
| Coil resistance(Ω±10%) | 90 | 90 | 360 | 360 | 320 | 320 |
| Parallel resistance(Ω) |
|
680 |
|
2700 |
|
2700 |
| Pick-up voltage(Max) | 65%(Nominal voltage) | |||||
| Drop-out voltage(Min) | 10%(Nominal voltage) | |||||
| Max allowable overdrive voltage(VDC) | 150%(Nominal voltage) | |||||
| Insulation level | Class B/Class F | |
| Insulation resistance | 100MQ(500VDC) | |
| Dielectric strength(Leakage current 1mA) | Dielectric strength(Between coil and contacts) | 500VAC minute |
| Dielectric strength(Between open contacts) | 500VAC minute | |
| Operate time(at nominal voltage) | ≤10ms | |
| Release time(without diode)(at nominal voltage) | ≤10ms | |
| Humidity | 5%～85%RH | |
| Ambient temperature | -40℃~+125℃ | |
| Vibration resistance | 5Hz~22.3Hz 10mm Double amplitude | |
| 22.3Hz~500Hz 98m/s² | ||
| Shock resistance | 294m/s² | |
| Weight | Approx 36g | |
| Construction | Dustproof | |
●Automotive electrical systems
●Engine control modules (ECM)
●Lighting systems (headlights, fog lights, LED systems)
●Air conditioning systems
●Heavy-duty vehicle electrical control
●Motorcycle electrical systems
●Aftermarket automotive modification kits
1. What is the advantage of a fuse design automotive relay?
It combines switching control and fuse protection in one unit, reducing external wiring complexity and improving circuit safety.
2. Can this relay handle high current loads?
Yes, the KLD (V4) supports 30A–60A stable switching, suitable for automotive lighting and heavy-load systems.
3. Is it suitable for harsh environments?
Yes, the optional dustproof design and industrial-grade structure ensure reliable performance in vibration, dust, and temperature variations.
4. Can KEYONG provide customized solutions?
Yes, KEYONG supports OEM customization including current rating, housing design, terminal type, and fuse specification.
5. What industries commonly use this relay?
It is widely used in automotive electronics, industrial automation, and power control systems.
As a professional automotive relay manufacturer China factory, KEYONG provides:
●Stable mass production capacity with over 80 million annual output
●Strict quality control under ISO-certified systems
●Advanced automated production and testing equipment
●Strong OEM/ODM customization capability
●Competitive factory direct pricing
●Fast delivery and global export experience
We are not only a relay supplier, but also a long-term technical partner for global industrial and automotive customers.
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350 Renmin North Road, Hengxi Town, Yinzhou District, Ningbo City, Zhejiang Province, China
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