This high-current version of MSD's Solid-State Relay Block replaces 4 standard relays and eliminates unsightly wiring. Each of the 4 independent channels can be activated using either power or ground and handles up to 35 amps of continuous current, for a combined 140 amps of power. It also supports Pulse Width Modulation, letting the output be controlled at up to 150 hertz with a 50-90% duty cycle — useful for controlling electric fans, water pumps, nitrous solenoids, auxiliary lighting, and similar accessories.
Specifications:
- Part Type: Multi-Purpose Relay
- Color: Red
- Channel Count: 4
- Amperage Rating: 35A continuous per channel (100A for 8 seconds)
- Combined Rating: 140A continuous
- Supply Voltage: 7V to 20V
- PWM: Up to 150 Hz, 50-90% duty cycle
- Part Number: 7564-HC
Recommended wire gauge: 2 AWG for main battery input, 8 AWG for channel outputs, 18-22 AWG for 12V/ground activation wires; channels can be paralleled for loads exceeding a single 35A channel.
FAQ
How is the 7564-HC different from the standard MSD relay block?
It steps up each channel's rating to 35 amps continuous (140 amps combined) versus 20 amps on the standard 7564, and adds Pulse Width Modulation support.
What is the recommended wire gauge for this relay?
MSD recommends 2 AWG for the main battery input, 8 AWG for each channel output, and 18-22 AWG for the 12V and ground activation wires.
Does the 7564-HC support PWM control?
Yes, it accepts a PWM input at up to 150 hertz with a duty cycle range of 50% to 90%.
What protections are built in?
Over-temp, short circuit, and overload protection with a channel reset, plus LED status indicators for diagnostics.
