Royalstone & Johnson Ltd is a procurement and electrical engineering services in oil and gas, manufacturing, property developing. etc. Established in July, 2008 with share capital of 100,0000. Surge Protective Devices are very fast switches, able to switch on in the order of nano-second(say 1ns to 100ns). During over voltages, these switches have rather low impedance able to conduct large current when switched on. In normal voltage SPDs have very high impedance i.e switched off.
Looking forward to partner with reputable organization to provide our services where norms will be respect.
