Zone selectivity reduces trip times and increases safety levels of an electrical installations. It achieves this by reducing the potential for damage caused by the fault and the disturbance to the power supply network and reducing the thermal and dynamic stresses on the circuit-breakers. This makes zone selectivity the perfect solution for systems with high rated current and short circuit values that require optimum safety and service continuity. ABB Emax power circuit breakers and Tmax T7 and T8 molded case circuit breakers come equip with zone selectivity features. All connections are made directly on the terminal box of these breakers, with no additional module needed.