The GK series of terminal boxes allow for the safe connection of up to three circuits with "intrinsic safety" and "increased safety" type protection inside zone 1/21 hazardous areas, which provides for, for instance, the electrical connection of control units with sensors in exposed locations. Fitting has been simplified thanks to clamp-down terminals. The devices are now available as screw-type models or in push-in versions with particularly easy handling. The portfolio of terminal boxes includes GK I and GK E series for intrinsically safe electric circuits and circuits with increased safety, respectively, as well as GK EI types that combine both. The devices are suitable for environmental temperatures ranging from –20 °C to +70 °C. They provide IP 65 ingress protection.