Solid state relay

The disclosure relates to solid state relay circuit for switching an electrical load. The solid state relay circuit may include a relay transistor; and a driver circuit comprising a constant current source. The driver circuit is configured and arranged to switchably operate the relay transistor, and the relay transistor is configured and arranged to switchably operate the electrical load. 本公开涉及用于切换电力负载的固态继电器电路。所述固态继电器电路可包括：继电器晶体管；和驱动器电路，所述驱动器电路包括恒定电流源。所述驱动器电路被配置和布置成可切换地操作所述继电器晶体管，且所述继电器晶体管被配置和布置成可切换地操作所述电力负载。