CB1aH-TR-12V ACB86221 Power Relay (3-Pack), 4-Pin SPST-NO 12VDC 70A High-Capacity Automotive Relay with Resistor, Heat Resistant to 257°F, Fixes P0480 P0645, Replacement for Headlights & A/C

High-Capacity Power Switching for Extreme EnvironmentsThe CB1aH-TR-12V (ACB86221) Relay is a precision-engineered replacement component for standard Mini-ISO power distribution systems. With its 70A high-capacity rating and high-profile heat resistance, this 4-pin SPST relay is built to handle the rigorous electrical demands of modern automotive, agricultural, and construction equipment.Designed with AgSnO2 (Silver Tin Oxide) contacts and a built-in Resistor, it provides superior arc resistance and protects sensitive vehicle electronics from voltage spikes. Its heat-resistant thermoplastic housing ensures structural integrity at temperatures up to 257°F, preventing common failures in high-load radiator fan and air conditioning circuits.Technical Specifications:Model: CB1aH-TR-12V / ACB86221Pin Configuration: 4-Pin SPST-NO (1 Form A)Voltage: 12V DC (Coil)Contact Rating: 70A @ 14VDCInternal Protection: Surge Suppression ResistorOperating Temp: -40°F to +257°F (-40°C to +125°C)Interchange & Cross-Reference:Panasonic: ACB86221, CB1aH-TR-12V, CB1aH-R-12VIndustry Standard: Mini-ISO 4-Pin 70A RelayTypical OE Applications: Cooling Fans, A/C Compressor, Headlights, Starter SolenoidCompliance Note: Model CB1aH-TR-12V is a specialized replacement electrical component designed for vehicle and industrial sub-assemblies, meeting standard electrical specifications for professional repair.

• SPECIFICATIONS & TERMINAL LAYOUT: Professional-grade CB1aH-TR-12V (ACB86221) 4-Pin SPST (Normally Open) power relay. Standard Mini-ISO terminal arrangement (30, 85, 86, 87). Rated for 12VDC coil with a 70A high-capacity contact load. Dimensions: 0.866" x 1.024" x 0.984"
• EXTREME THERMAL RESISTANCE: Engineered as a "T-type" heat-resistant component, capable of withstanding ambient temperatures up to 257°F (125°C). Optimized for high-heat environments such as engine bays, cooling fan shrouds, and agricultural machinery power centers
• DIAGNOSTIC FAULT RESOLUTION: Directly resolves electrical circuit failures indicated by DTC codes P0480 (Radiator Fan Control) and P0645 (A/C Clutch Control). Restores heavy-duty switching for high-load inductive circuits including headlights, EPS, and starter motors
• SUPERIOR ARC RESISTANCE: Features AgSnO2 (Silver Tin Oxide) contacts combined with a built-in surge suppression resistor. This configuration provides exceptional conductivity and physical durability against contact welding during high-surge startup cycles
• HEAVY-DUTY REPLACEMENT PART: Sold as a 3-pack for comprehensive fleet maintenance. Explicitly defined as a "Replacement Component" for professional automotive and industrial repair, ensuring OEM-spec electrical performance without system modification