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NF50-HRP Datasheet(PDF) 10 Page - Mitsubishi Electric Semiconductor |
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NF50-HRP Datasheet(HTML) 10 Page - Mitsubishi Electric Semiconductor |
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10 / 105 page  9 Table 3.1 Comparison of Thermal-Magnetic, Hydraulic-Magnetic and Electronic Types Item Ambient temperature Frequency Mounting attitude Flexibility of operating characteristics Flexibility of rated current Thermal-magnetic type Operating current is affected by ambient temperature (bimetal responds to absolute temperature not temperature rise). Negligible effect up to several hundred Hz; above that the instantaneous trip is affect- ed due to increased iron losses. Negligible effect. Bimetal must provide adequate deflection force and desired temperature characteris- tic. Operating time range is limited. Units for small rated currents are physically impractical. Hydraulic-magnetic type Affected only to the extent that the damp- ing-oil viscosity is affected. Trip current increases with frequency, due to increased iron losses. Mounting attitude changes the effective weight of the magnetic core. Oil viscosity, cylinder, core and spring design, etc., allow a wide choice of operat- ing times. Coil winding can easily be designed to suit any ampere rating. Negligible effect up to 600A; Above that operating current decreases due to increase of a fever. IF distortion is big, minimum operating cur- rent increases. Distorted wave Electronic type Within the range of 50(60)~100% of rated current, any ampere rating are practical. Also, to lower the value of short-time delay or instantaneous trip can be easily done comparatively. Operating time can be easily shortened. To lengthen operating time is not. Negligible effect Tripping current of some types decrease due to CT or condition of operating circuit with high frequency, and others increase. Negligible effect For peak value detection, operating current drops. Current Current Ceiling Horizontal ON ON OFF OFF Current Current High frequency Low frequency Current High frequency Low frequency Current High temperature Low temperature Current High temperature Standard temperature Low temperature Current Current Current Current Above 700A Current Small current width Current width Current Peak value detection Current Current |
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