• System Control

Load Break Switch

System Control, certified by ICL Ltd under ISO 9001: 2000, offers a Load Break Switch. This compression switch-disconnector combines the function of a switch and disconnector in one unit. The switches are capable of making, carrying and breaking currents under normal service conditions. The compression switch disconnector can also carry abnormal current for a certain period of time, e.g., short circuit current. Typical applications include switching of transformers, overhead lines, capacitors, cables and ring mains. The compression switch disconnector works on the principle of extinguishing the arc by a blast of compressed air produced by the switch itself while opening. With main moving contact tube, the arcing contact and the piston move along in the pressure cylinder, which is made from insulating material. The piston compresses the air, which expels under pressure through the quenching nozzles surrounding the arcing contact. When the main contact reaches a certain distance the circuit is interrupted by the arcing contact and in the same time a blast of compressed air extinguishes the arc. During the closing operation the arcing contact in held back due to the piston retarded in the contact tube and hence the making current will be carried by the main moving contacts. The switches are equipped with a toggle spring mechanism which independent of the operator's skill ensures both high opening and high closing speed. The switches are fitted with built-on fuse bases equipped with an additional tripping mechanism.