CTL2.5UH(I.S)D2 Internally shorted Terminal Blocks with built-in Diode for reserve polarity protection ideal choice for control systems where sensor and actuator applications are involved. The simplified three level connections with internally shorted helps in tremendously increase wiring density in the circuit. In application where switching indication is required CTL2.5UH(I.S) D2 is the one with built in electronic component. Marking tags in blue and red colour besides the conventional white colour are suggested for effective identification.