IDEC RSC relays have technology to dissipate the heat away from main switching components, making them a great buy. Other relays may require you to add your own heat sink or deal with a burned out product, but the new RSC relays from IDEC have a built-in heat sink making them easy to install and get running. The heat sink, along with an epoxy-free design, eliminates the need to de-rate your relay and also increases its life expectancy. And an LED status indicator makes sure you can see it working. The slim design of the RSC relays provides a compact unit for DIN Rail or panel mounting without wasting space. 20A and 30A current ranges are 22.5mm, while the relays with 45A current are 45mm. All IZUMI RSC relays are UL recognized, CE marked, as well as being lead-free and RoHS compliant.