UL 4248-4:2018-04 Fuseholders – Part 4: Class CC.
1.1.2 These requirements cover fuseholders intended for use with Class CC Fuses as described in
NMX-J-009/248/4-2000-ANCE, CSA C22.2 No. 248.4, UL 248-4, Low-Voltage Fuses — Part 4: Class CC
4.1 Class CC fuseholders have a short-circuit withstand rating of 200,000 A. Class CC fuseholders are
rated 600 V, and have one body size corresponding to the Class CC fuse body size.
5.1 Summary of characteristics
5.1.3 Voltage and current rating
184.108.40.206 Class CC fuseholders shall be rated 600 V.
220.127.116.11 Class CC fuseholders shall be rated 30 A.
5.1.4 Withstand rating
18.104.22.168 Class CC fuseholders shall have a short-circuit withstand rating of 200,000 A.
6.1 Marking of fuseholders
22.214.171.124 In addition to the requirements of Part 1, the fuseholder shall be marked:
f) “Use Class CC Fuses”;
g) for panel mount and in-line fuseholders, “line” and “load” shall be marked, with the terminal recessed furthest in the device designated as the line terminal; and
h) “DO NOT OPERATE UNDER LOAD” or equivalent for fuseholders of the modular design where the fuse is inserted or removed by use of a carrier.
8.1.1 Types of tests
126.96.36.199.1 Each fuseholder shall be subjected to the tests as specified in Part 1, with the addition of the following:
e) verification of effectiveness of rejection member.
8.4 Verification of temperature rise
8.4.3 Test method
188.8.131.52 With dummy fuses in place and carrying rated current continuously, the temperature on a material or component or electrical insulation shall not exceed the values in Table 8.4A.
184.108.40.206 Dummy fuses shall be unplated copper and shall conform to the dimensions in Figure 8.4A.
220.127.116.11 The temperatures specified in Table 8.4A are based on an assumed ambient temperature of 25°C
(77°F). A test may be conducted at an ambient temperature within the range of 20 — 40°C (68 — 104°F).
18.104.22.168 During a test conducted at an ambient temperature of 25°C (77°F), an observed temperature shall
not exceed the required value specified in Table 8.4A.
22.214.171.124 If a test is conducted at an ambient temperature other than 25°C (77°F), an observed temperature shall be corrected as described in Clause 126.96.36.199. Neither a corrected temperature nor an observed temperature shall exceed the required value specified in Table 8.4A.
188.8.131.52 An observed temperature shall be corrected by addition [if the ambient temperature is lower than
25°C (77°F)] or subtraction (if the ambient temperature is higher than 25°C) of the difference between
25°C and the ambient temperature.
184.108.40.206 If a corrected temperature exceeds the required value specified in Table 8.4A, at the request of the manufacturer, the test may be repeated at an ambient temperature closer to 25°C (77°F).UL 4248-4 pdf download.