Transcription of Working with trip characteristic curves
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Working with trip characteristic curves
Low voltage circuit breakersWorking with trip characteristic curvesLow Voltage Products & Systems 1 ABB Inc. 888-385-1221 1 SXU210170B0201 Index1. Introduction ..22. Main Definitions ..33. ABB Low Voltage Circuit Breakers complying with the Standards UL 489 and UL 1066 Common terms on Low Voltage Circuit Breakers ..7 ABB Low Voltage Circuit Breakers ..8 Molded-Case Circuit Breakers (Tmax) ..8 Low Voltage Power Circuit Breakers (Emax) ..104. Thermal Magnetic and Electronic trip Units for ABB Circuit Breakers Thermal Magnetic trip Units ..12 Overload Protection (L) ..12 Instantaneous Short Circuit Protection (I) ..12 Thermal magnetic trip Units for Tmax Circuit Breakers ..13 Time-Current Curve of a Thermal magnetic trip Unit TMA.
it to function, and is activated by means of analog or digital processing of a sampling of the current flowing through the circuit breaker. Information functions, if provided, may require external power and/or control circuits. The direct-acting overcurrent trip devices may include ground trip elements.
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