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A <a href="http://www.shcetelec.com/electrical-accessories/timer-relay/" target="_self">timer relay</a> is a combination of an electromechanical output relay and a control circuit. The contacts will open or close before or after a pre-selected, timed interval.
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Time delay relays are initiated or triggered by one of two methods:
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Application of input voltage/auxiliary supply will either initiate the unit or make it ready to initiate when a trigger signal is applied.
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Applying a trigger signal is used to initiate the unit after input voltage has been applied. This trigger signal can either be a control switch (dry contact switch) or a power trigger (voltage).
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What is Comb Busbar?
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<a href="http://www.shcetelec.com/electrical-accessories/comb-busbar/" target="_self">Comb busbar</a> is one of the most basic switch gear instruments. The main purpose of a comb busbar is to distribute power to switch gear components such as MCBs. There are two types of comp busbar viz, single phase comp busbar and three phase comb busbar. It can be found in small distribution boards that you can find at you home. Single phase comb busbar is used in single phase power distributions and three phase comb busbar is used in three phase power distribution systems. Two lead comb busbar are also available and are used in DC system.
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The main purpose of using comb busbar is to reduce the number of wire connections. In distribution boards a output of the isolators or ELCBs are connected to a number of MCBs or
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Residual Current Devices. If comb busbar is not used, numerous wires should be connected to the ELCB/Isolator output terminals to supply the MCBs. Hence in order to avoid that a single comb busbar is used. The comb busbar supplies numbers circuit breakers simultaneously thereby reducing the number of wires used.
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