OPERATING THEORY OF SOLID-STATE OVERCURRENT RELAYS A. Introduction Most protective relays used in the mine today are EMRs, The EMR performs three functions, using its operating coil ... Power to operate an SSR may be taken from the signal source (i.e. power circuit CT) or from an external power supply. ... A schematic of an SSR, equivalent to the EMR of Figure 1. is shown in Figure 2a.
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