With a solid-state relay, you can switch a large AC voltage with a small DC voltage from the BrewPi Spark.    This SSR is more suitable if you want to switch high currents, for heating elements of 2500W, 3500W, or even 5500W. When using the SSRs for high currents, use them with a heat sink. We sell a fitting low profile heatsink.    These SSRs are high quality and come with a clear protective cover. They also have an indicator LED that shows when the SSR is on. Specifications: Maximum current: 40A Output voltage: 24~480V AC Input voltage : 3-32V DC Wide range for the energizing signal , 3V to 32VDC. Status LED shows the relay state at a glance. 2500 V Dielectric Strength Output Voltage : 28VAC  up to 285VAC, at 50 or 60 Hz We stock the standard ratings from 10 to 40A. Higher amp ratings up to 100Amp are available on request. Use a heat sink for sizes over 10A. Plastic cover improves the safety and isolation of circuits. Packages Include: 1 x LIRRD Solid State Relay