UL 2367-2021 pdf free download.Solid State Overcurrent Protectors.
12.3 The device is to be energized continuously until constant temperatures are reached on and about the device.
12.4 The temperature test is to be conducted at an ambient temperature within the range of 10 – 40 °C (50 – 104 °F). Where the manufacturer’s specified maximum operating ambient temperature is higher than 40 °C (104 °F), the test is instead to be conducted at the manufacturer’s specified maximum operating ambient temperature.
12.5 When a test is conducted at an ambient temperature other than 25 °C (77 °F) or other than the maximum operating ambient temperature required in 12.4, an observed temperature shall be corrected as described in 12.6. Neither a corrected temperature nor an observed temperature shall exceed the required values specified in 12.1.
12.6 An observed temperature is to be corrected by addition [if the ambient temperature is lower than 25 ° C (77 ° F) or the required maximum operating ambient temperature] or subtraction [if the ambient temperature is higher than 25 °C (77 °F) or the required maximum operating ambient temperature] of the difference between 25 ° C or the required maximum operating ambient temperature, and the measured ambient temperature.
12.7 When a corrected temperature exceeds the required value specified in 12.1, at the request of the manufacturer, the test may be repeated at an ambient temperature closer to 25 °C (77 °F) or the required maximum operating ambient temperature, whichever is applicable.
12.8 A temperature is considered to be constant when three successive readings taken at intervals of 10 percent of the previously elapsed duration of the test, but not less than 5-minute intervals, indicate no further increase.
12.9 Measurement of temperatures shall be by thermocouples. The thermocouples shall be secured by Fuller’s earth and waterglass, welding, soldering, or other method that provides thermal contact.
12.10 The thermocouples shall consist of iron and constantan or chromel and alumel wires not larger than 30 AWG (0.05 mm 2 ).
12.11 An alternative method of temperature measurement may be used when upon investigation it is shown that the alternative method provides equivalent results.
13 Overload Operation Test
13.1 The devices shall be tested according to 13.2 and 13.3 and shall exhibit no appreciable change in the current limiting characteristics from those demonstrated for the as-received samples.
13.2 The input connections of the device are to be connected to a source with a short circuit current capability of at least 250 A (1000 / V) and a power capacity of at least 250 VA.
13.3 The output connections are to be loaded with a resistance value that will result in the device under test conducting at least 150 percent of its rated maximum continuous current until the device opens the circuit. Fifty operations of the device at this current level are to be conducted. One sample is to be cycled with the enable pin and another sample is to be cycled with the power pin.
13.4 Following the Overload Operation Test, the Calibration Tests of Section 11 shall be repeated.UL 2367 pdf download.