TBH, I didn't realize relay coils dissipate that much heat when energized. This one gets to nearly 29*C. TE has an interesting application note on PWM-ing the relay to keep temp and energy consumption low. https://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=13C9133_DC_Relay_Power_Reduction_AppNote&DocType=CS&DocLang=EN
