Hot sale Dongfeng KR truck parts Relay assembly 3735090-C5101

At the core of the assembly is a heavy-duty electromagnetic relay optimized for Dongfeng KR’s high-power electrical systems (e.g., headlights, fuel pumps, windshield wipers). It boasts a rated contact current of 35A/12V DC (surge current up to 80A) and a coil voltage that auto-adapts to the truck’s 12V/24V system—handling heavy loads without voltage drops or overheating. The relay’s switching response time is ≤8ms, ensuring instant activation of connected devices (critical for safety functions like emergency lights). With a contact resistance of ≤45mΩ, it minimizes power loss, maintaining stable voltage supply to electrical components even during peak load (e.g., simultaneous use of headlights and wipers). Unlike low-capacity relays that fail under high current, this design endures 120,000+ switching cycles (equivalent to 6 years of heavy use) with no contact degradation

Built to withstand the harsh conditions of a truck’s engine bay—constant vibration, temperature fluctuations, and moisture—the assembly uses premium durable materials. The outer housing is flame-retardant PA66-GF30 plastic (UL94 V-0 rating) reinforced with 30% glass fiber, tolerating temperatures from -45°C (cold starts) to 130°C (engine heat soak) without warping or cracking. The internal electromagnetic coil is wound with high-temperature enameled copper wire (180°C rating) and encapsulated in epoxy resin, protecting it from vibration-induced damage and moisture ingress. The mounting clip is 304 stainless steel with a passivated finish, ensuring secure attachment to the fuse box even under severe chassis vibration (10–2,500 Hz frequency range). Unlike fragile plastic relays that break or short-circuit, this rugged design maintains structural integrity for 7+ years

Engineered with safety as a priority, the assembly integrates comprehensive safeguards to protect the truck’s electrical system. It includes a built-in 40A thermal fuse that cuts power automatically if current exceeds safe limits, preventing wire overheating or insulation melting (a common cause of electrical fires). The relay’s contacts are plated with silver-palladium alloy (12μm thickness) to resist arcing during switching—even under high-current loads—reducing contact wear and fire risk. Additionally, the housing features a pressure-relief vent that dissipates heat and prevents internal pressure buildup, keeping components below 85°C during continuous operation. These features meet IEC 60947-5-1 and SAE J1939 safety standards, eliminating risks of component burnout, system shutdowns, or electrical fires

Designed for hassle-free replacement by technicians or DIY owners, the assembly simplifies installation and upkeep. No specialized tools are needed: installation takes 5–10 minutes—locate the original relay in the fuse box (marked with the OEM part number), pull out the old unit, align the new relay’s pins with the harness connector, and push until it clicks into place. The transparent top cover allows visual inspection of internal contacts (for signs of arcing or wear), enabling quick troubleshooting without disassembly. Unlike sealed relays that require diagnostic tools to test, this design saves maintenance time and costs. Each unit undergoes rigorous testing: contact resistance checks, vibration trials (18G acceleration), temperature cycling (-45°C to 130°C), and surge current testing. Backed by a 24-month warranty against defects (e.g., contact failure, coil burnout, housing cracking), it ensures long-term reliability for Dongfeng KR trucks