Letters are sometimes added to specify the application ieee standard c372 2008. The switch may have any number of contacts in multiple contact forms such as make contacts break contacts or combinations thereof.
Auxiliary Relays From 1924 Silent Sentinels Valence
What are the numbers on a relay. If connected to nc the load remains connected before trigger. Common com common is connected to one end of the load that is to be controlled. Selection from iec 617 ieee c372 1991 and ieee c372 1979 1mrk 590 006 ben page 6 ieee device numbers and functionsand functions contd contd 15 speed or frequency matching device functions to match and hold the speed or the frequency of a machine or of a system equal to or approximately equal to that of another machine source or system. Normally close nc the other end of the load is either connected to no or nc. Ansiieee standard device numbers in north america protective relays are generally referred to by standard device numbers. A relay is an electrically operated switchit consists of a set of input terminals for a single or multiple control signals and a set of operating contact terminals.
16 reserved for future application 17 shunting or discharge switch serves to open or to close a shunting. Suffix and prefix letters may be added to further specify the purpose and function of a device. Relay configurations and types. Gedigitalenergycom 3 device no. Description 512 negative sequence time overcurrent 52 ac circuit breaker 53 exciter or dc generator relay 54 turning gear engaging device 55 power factor relay 56 field application relay 57 short circuiting or grounding device 58 rectification failure relay 59 overvoltage relay 59b bank phase overvoltage 59p phase overvoltage 59n neutral overvoltage 59nu neutral voltage unbalance 59p phase overvoltage 59x auxiliary overvoltage 592 negative sequence. The numbers 85 86 30 87 87a or other numbers for different relay configurations are normally moulded into the plastic next to each pin and also shown on the circuit schematic.
Relays are used where it is necessary to control a circuit by an independent low power signal or where several circuits must be controlled by one signal. Device numbers the more commonly used ones are in bold. Relay symbols and device numbers. Used to triggeronoff the relay normally one end is connected to 5v and the other end to ground. Used to triggeronoff the relay normally one end is connected to 5v and the other end to ground. One physical device may correspond to one function number for example 29 isolating contactor or a single physical device may have many function numbers associated with it such as a numerical protective relay.
Gallery of What Are The Numbers On A Relay
