CT accuracy class is a standardized rating defining the maximum allowable ratio error and phase displacement. A protection CT designed to perform during 20× overcurrent events lacks the fine accuracy needed for revenue calculations.
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When other protection fails or is unable to operate, such as when the proper circuit breaker(s) fail to trip, backup protection is supposed to kick in and clear the fault or detect the abnormal condition in the ti.
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These ATEX certified relays use intrinsically safe designs or explosion-proof enclosures to prevent sparking that could trigger fires or explosions. The safety switches which are a part of the installation and control product portfolio are specially designed for hazardous environments. Our easy to use units comply with IEC/EN 62626-1 Class I, making them exceptionally reliable and.
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In and, ANSI Device Numbers can be used to identify equipment and devices in a system such as,, or. Many of these devices protect electrical systems and individual system components from damage whe. For example, a time overcurrent relay is designated a 51 device, while an instantaneous overcurrent is a 50 device. The International Electrotechnical Commission (IEC) standards 617 and 60617 also provide different symbols and terminology for most of the device numbers that are defined by C37.
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The various protective functions available on a given relay are denoted by standard. For example, a relay including function 51 would be a timed overcurrent protective relay.
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