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

Mission-Critical Relay for Electric Vehicle Power Systems

 

This 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" errors

 

Technical 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 fluctuations

 

Compatibility Guide:

Direct replacement for:

 

BMW: i3 (2017-2022) battery junction box, i8 (2019) HV contactor

 

Tesla: 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.