UL 489A-2013 pdf download – Circuit Breakers for Use in Communications Equipment.
9 Calibration Test 9.1 A circuit breaker shall comply with the Calibration tests of the Standard for Molded-Case Circuit Breakers, Molded-Case Switches, and Circuit-Breaker Enclosures, UL 489. 9.2 When a circuit breaker is intended to be used in an ambient temperature other than 25°C or 40°C, tests shall be performed with the representative circuit breaker in air at the marked ambient temperature in addition to the tests at 25°C. See 1 6.2. When the circuit breaker is intended to be used over a range of ambient temperatures, the circuit breaker shall be tested in ambient air at both the maximum and minimum ambient temperatures. See 1 6.3. 10 Overload Test 1 0.1 A circuit breaker shall comply with the Overload test of the Standard for Molded-Case Circuit Breakers, Molded-Case Switches, and Circuit-Breaker Enclosures, UL 489, except that the test current shall be 1 50% of the current rating. The circuit shall have a time constant not less than 0.003 seconds. 11 Temperature Test 1 1 .1 A circuit breaker shall operate without tripping until constant temperatures are attained, and materials used in the construction of a circuit breaker shall not be affected adversely by the temperatures to which they are exposed during the test.
13 Interrupting Test 1 3.1 The interrupting test shall be performed in accordance with the Standard for Molded-Case Circuit Breakers, Molded-Case Switches, and Circuit-Breaker Enclosures, UL 489, except that the prospective current may be any value as required for the application. The test current for the test in the Y-sequence shall not exceed the short-circuit current rating of the circuit breaker. See 1 6.6. 14 High Ambient Conditioning Test 1 4.1 When tested as described in this Section, a circuit breaker shall not become inoperable as a result of exposure to high ambient temperatures.
15 General 1 5.1 The electrical ratings of a circuit breaker shall be as described in the Standard for Molded-Case Circuit Breakers, Molded-Case Switches, and Circuit-Breaker Enclosures, UL 489, except that only DC voltage ratings are permitted and the rating is not limited to a specific voltage. ″Slash″ ratings are not permitted.