2-Pack CB1aH-TR-12V ACB86221 Relay - 70A 12VDC 4-Pin SPST Automotive Relay with Resistor - Compatible with BMW/Tesla - Fixes High-Voltage System & Battery Isolation Faults

Mission-Critical Relay for Electric Vehicle Power SystemsThis 4-pin SPST (1 Form A) automotive relay with integrated suppression resistor is engineered for: High-voltage battery pack isolation control DC fast charging circuit management Resolution of Tesla BMS_a066 "Isolation Fault" and BMW 21A147 "High-Voltage System Malfunction" errorsTechnical Superiority: Aerospace-Grade Contacts: 316L stainless steel with 0.8μm gold plating resorts sulfide corrosion in humid EV battery trays Instantaneous Response: <5ms operate time at 9VDC prevents MOSFET burnout in BMS controllers Military-Spec Coil: 190Ω ±3% resistance maintains stable operation through 48V mild-hybrid voltage fluctuationsCompatibility Guide:Direct replacement for:BMW: i3 (2017-2022) battery junction box, i8 (2019) HV contactorTesla: Model S (2021+) pre-charge relay (P/N 1097002-00-F)Rivian: R1T battery disconnect module (secondary circuit)Quality Validation:100% tested per:✓ ISO 16750-2 (Vibration)✓ SAE J1742 (Current Cycling)✓ UL 508 (Dielectric Strength)Compliance Notice:BMW, Tesla, Rivian are registered trademarks. This product is compatible with but not endorsed by vehicle manufacturers. Consult service manual before installation.

• Direct OEM Replacement: Matches BMW Part 61315A3FD71 and Tesla Relay ACB86221 - Resolves Battery Isolation Errors in 2017-2023 i3/i8/Model S/X High Voltage Systems (Tesla BMS_a066/BMW 21A147)
• Ultra-High Current Capacity: 70A Continuous/150A Surge Ratings Handle EV Battery Contactors and DC-DC Converters - 316L Stainless Steel Contacts Outperform Copper Alloys
• Integrated Flyback Protection: Built-in 680Ω Resistor Suppresses Voltage Spikes Up to 400V - Protects ECU/PCM from Coil Collapse Transients
• EV-Grade Thermal Management: Operates from -40°F to 356°F (-40°C to 180°C) with Ceramic Arc Chutes - LV124 Certified (BMW EV Standard)
• Complete Dual Relay Kit: Includes 2 relays with IP69K rated silicone boots - Replaces main/pre-charge relays simultaneously like factory repair procedure