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| | | Resistance and Impedance Characteristics | | |
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| | | — o 3" cd V) Go — — co' 3" | | |
| | | Coil Data | | |
| | | Impedance Correction Curve | | |
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| | | | | | | | | | | id Current | DC Resistance | AC Impedance (50/60Hz) | | | | Curves | Curves | | | | | AD, MD | AA, BA, MA | | | | 0.3A | 9.67Q | 9.82Q | | | | 0.5A | 3.24Q | 3.36Q | | | | 0.75A | 1.45Q | 1.490 | | | | 1A | 0.90Q | 0.92O | | | | 2A | 0.21Q | 0.210 | | | | 3A | 0.09Q | 0.092O | | | | 5A | 0.036Q | 0.036O | | | | 7.5A | 0.017Q | 0.0180 | | | | 10A | 0.012Q | 0.0120 | | | | 15A | 0.0066Q | 0.00680 | | | | 20A | 0.0048Q | 0.0048O | | | | 25A | 0.0043Q | 0.00430 | | | | 30A | 0.0036Q | 0.00410 | | | | | | | | | | |
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| | | c Ü | | |
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| | | S ra | | |
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| | | 0.1 | | |
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| | | 0.01 | | |
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| | | 0.001 0.01 0.1 1 10 100 Impedance (Q) | | |
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| | | 3" | | |
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| | | Resistance Correction Curve | | |
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| | | 100 | | |
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| | | 10 | | |
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| | | (A) | | |
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| | | a y V) Go o n 3t cd 00 | | |
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| | | Tolerance ±25% (up to 20A), ±50% (25A and over). | | |
| | | A | | |
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| | | s ra x | | |
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| | | 0.1 | | |
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| | | Voltage Drop Due to Resistance or Impedance The internal resistance or impedance of a circuit breaker tends to be larger for a smaller rated current. Therefore, when circuit breakers with a small rated current are used, voltage drop should be taken into consideration. Internal resistance also varies with time delay curves, even at the same rated current. This should also be considered during installation. Time Delay Curve and Ambient Temperature Since NRA series circuit breakers employ an electromagnetic tripping system, the rated current (trip current) is not affected by the ambient temperature, but the time delay varies with the oil viscosity in the tube. Lower oil viscosity at higher temperatures results in shorter delay; whereas at lower temperatures, the delay will be prolonged. The time delay curves, shown starting on page 888, are at 25°C. Time delay curves can be corrected. | | |
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| | | 0.001 | | 0.1 | | 10 | | 100 | | |
| | | 0.01 | | |
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| | | Resistance (Q) | | |
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| | | Temperature Correction Curves | | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Curves AA, BA, MA, AD, and MD At the minimum tripping current (125% current) | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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| | | —I s rr | | |
| | | 300 | | |
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| | | 200 | | |
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| | | o | | |
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| | | 60 | | |
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| | | 40 | | |
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| | | -40 -30 -20 -10 | | 10 20 | | 30 40 | | 50 | | 60 70 80 90 | | |
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| | | 25 | | |
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| | | Ambient Temperature (°C) | | |
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| | | r e Oí 3t r s | | |
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