NINGBO KEYONG JINGSHENG ELECTRICAL APPLIANCE CO., LTD. offers the KLDH (V7) Automotive High Current Relay, a compact and durable solution designed for automotive and industrial power control up to 100A. It supports 1 Form A, 1 Form B, and 1 Form C contact configurations for flexible circuit design, and operates reliably in harsh environments from -40°C to 125°C with arc suppression via internal blowout magnets. Available in dustproof and sealed housing types with flux-proof protection, it ensures stable long-term performance. With 12VDC and 24VDC coil options, plus multiple installation methods including plug-in, PCB, and quick-connect, this relay is ideal for OEM buyers seeking reliable, high-current switching solutions.
An Automotive High Current Relay is an electromechanical switching device used in vehicle electrical systems to control high-power circuits with a low-power signal. It acts as an interface between the control unit (such as ECU or switch) and high-load components like headlights, cooling fans, motors, air conditioning systems, and heaters.
In simple terms, it is a safe power switch that allows small electrical signals to control large electrical currents in vehicles.
Automotive High Current Relays are widely used to:
Control high-power automotive devices (fans, pumps, lights, motors)
Isolate control circuits from high-current loads
Protect switches and ECUs from electrical overload
Enable reliable automatic control in modern vehicles
Improve overall electrical system safety and stability
1) High Current Capacity
Supports 20A, 30A, 40A, up to 60A+ for demanding automotive applications.
2) High Reliability & Long Service Life
Designed with durable contact materials to withstand frequent switching and reduce wear.
3) Excellent Temperature Resistance
Stable performance under harsh conditions such as engine bay heat, vibration, and humidity.
4) Compact Design
Suitable for modern vehicles with limited installation space and high integration requirements.
5) Flexible Mounting Options
Available in PCB mount, plug-in, and socket types for different system designs.
| Contact arrangment | A/B/C |
| 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 | 80A(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 | 10Hz~55Hz 3.0mm Double amplitude | |
| 55Hz~500Hz 100m/s² | ||
| Shock resistance | 294m/s² | |
| Weight | Approx 40g | |
| Construction | Dustproof Sealed type | |
●Automotive lighting systems (headlights, fog lights)
●Cooling fan and radiator systems
●Air conditioning systems
●Power windows and seat control systems
●Electric pumps and motors
●Heating systems (seat heaters, defoggers)
●Industrial and commercial vehicle systems
●New energy vehicle auxiliary circuits
Automotive High Current Relays help solve critical engineering and safety issues:
●Prevents switch burnout caused by high current loads
●Reduces risk of circuit overheating and failure
●Improves overall vehicle electrical safety
●Simplifies automotive wiring and system design
●Extends lifespan of electrical components
●Enhances system automation and reliability
●Reduces maintenance and replacement costs
Q1: What is the difference between a relay and a switch?
A relay uses a low-power signal to control a high-power circuit, while a switch directly handles the load. Relays provide safer and more reliable control.
Q2: Why are high current relays necessary in vehicles?
Because automotive electrical systems involve high loads, direct switching would cause overheating, contact damage, or system failure.
Q3: Do relays generate heat during operation?
Yes, slight heating is normal. However, high-quality relays are designed to operate safely within specified temperature limits.
Q4: How do I know if a relay is faulty?
Common signs include no switching response, intermittent operation, burnt contacts, or complete circuit failure.
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350 Renmin North Road, Hengxi Town, Yinzhou District, Ningbo City, Zhejiang Province, China
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