MSD High-Current Solid-State Relay 4-Channel 35A Black 75643-HC

If you're running multiple high-draw electrical accessories—whether it's electric cooling fans, nitrous solenoids, auxiliary lighting, or water pumps—a traditional relay setup becomes bulky and unreliable. The MSD 75643-HC replaces that maze of mechanical relays with a single, compact solid-state unit that handles up to 140 amps of continuous current across four independent channels, eliminating failure points and simplifying your wiring harness. With built-in diagnostics, over-temperature protection, and PWM capability for variable power control, this relay gives you the precision control and safety margin serious builds demand.

• Four independent channels
• 35 amps continuous per channel
• 100 amps peak (8 seconds)
• 140 amps total capacity
• 7-20 volt operation
• PWM-capable, 15 Hz frequency
• 50-90% duty cycle range
• Over-temperature protection
• Short circuit protection
• Overload protection
• Channel reset function
• Diagnostic LED indicators
• Single-wire activation
• 90° rotatable mounting tabs
• Black finish
• Street and racing legal