Amazon.com: 4 Prong 70A Relay 12V 70 Amps for Audi/VW/Volvo/Mercedes/Saab/GM, Flosser 2270 : Tools & Home Improvement
Amazon.com: 24 Volt Relay
Amazon.com: D-FLIFE 12V 16-Channel Relay Interface Board Module Optocoupler LED LM2576 Power for Arduino DIY Kit PiC ARM AVR (12V 16-Channel) : Electronics
Amazon.com: IIVVERR DC 24V Coil PCB Mount Electromagnetic Power Relay TR93F- 24VDC-SC-C (DC 24V Coil PCB Mount Electromagnetic Power Relay TR93F-24VDC-SC-C : Everything Else
Amazon.com: DC Motor Driver, DROK L298 Dual H Bridge Motor Speed Controller DC 6.5V-27V 7A PWM Motor Regulator Board 12V 24V Electric Motor Control Module Industrial 160W with Optocoupler Isolation : Industrial