Dongfeng KR truck parts Relay assembly 3735090-C5100 in stocked

At the core of the assembly is a high-performance electromagnetic relay that delivers consistent circuit switching for critical truck systems (e.g., headlights, windshield wipers, fuel pumps). It features a rated coil voltage of 12V/24V (auto-adaptive to Dongfeng KR’s electrical system), a contact rating of 30A/12V DC (capable of handling high-current loads without overheating), and a switching response time of ≤10ms—ensuring fast, accurate activation of connected devices. The relay’s contact resistance is ≤50mΩ, minimizing power loss during operation and maintaining stable voltage supply to electrical components. Unlike low-quality relays with inconsistent contact performance, this assembly undergoes 100,000+ switching cycle tests (equivalent to 5 years of heavy use) with no contact degradation, guaranteeing reliable control of the truck’s essential electrical functions

Built to withstand the harsh conditions of a truck’s engine bay—constant vibration, temperature extremes, and moisture—the assembly uses durable materials for long-term reliability. The outer housing is made of flame-retardant PA66 plastic (UL94 V-0 rating) that tolerates temperatures from -40°C (cold starts) to 125°C (engine bay heat) without warping or cracking. The internal electromagnetic coil is wound with high-temperature copper wire (rated at 155°C) and encapsulated in epoxy resin, protecting it from vibration-induced damage and moisture ingress. The mounting clip is made of spring steel (304 grade) with a corrosion-resistant coating, ensuring secure attachment to the fuse box even under severe chassis vibration (10–2,000 Hz frequency range). Unlike fragile plastic relays that fail under vibration, this rugged design maintains structural integrity for 6+ years of daily use

Engineered with safety as a priority, the assembly integrates comprehensive safeguards to protect the truck’s electrical system from damage. It includes an over-current protection fuse (built into the relay housing) that automatically cuts off power if the current exceeds 35A—preventing wire overheating or insulation melting caused by short circuits. The relay’s contacts are plated with silver-nickel alloy (10μm thickness) that resists arcing (a major cause of contact wear and electrical fires) during switching, even under high-current loads. Additionally, the housing features a vented design that dissipates heat generated during operation, keeping internal components below 80°C to avoid thermal degradation. These features meet IEC 60947-5-1 safety standards, eliminating risks of electrical fires, component burnout, or system shutdowns due to relay failure

Designed for hassle-free replacement by fleet technicians or DIY owners, the assembly simplifies installation and upkeep. It requires no specialized tools—installation takes 5–8 minutes: locate the original relay in the fuse box (marked with OEM part number for easy identification), pull out the old relay, align the new assembly’s pins with the harness connector, and push until it clicks into the mounting slot. The relay’s transparent top cover allows visual inspection of the internal contacts (for signs of wear or arcing), eliminating the need for disassembly during troubleshooting. Unlike relays with sealed housings that require testing tools to diagnose issues, this design enables quick visual checks—saving maintenance time. Each unit undergoes electrical performance testing (contact resistance, switching time), vibration testing (15G acceleration), and temperature cycling trials, backed by a 18-month warranty against defects (e.g., contact failure, coil burnout, housing cracking)