W-C-375E
3.12 Dielectric withstanding voltage. When circuit breakers are tested as specified in 4.7.9, the leakage current shall not exceed 1.0 milliampere and there shall be no evidence of flashover, mechanical damage, arcing, or breakdown.
3.13 Calibration 200 percent at 25°C ±3°C. When tested as specified in 4.7.10, the tripping time shall not exceed the maximum tripping time specified in table II.
TABLE III. Maximum temperature rise of construction materials in degrees Centigrade.
Materials |
Temperature (°C) |
Thermoplastic or rubber-insulated conductors Plain or plated copper or copper-alloy separable contacts Conductors having varnished-cloth insulation Conductors having slow-burning insulation Fiber employed as electrical insulation Wood or other combustible material Urea composition Melamine Phenolic composition employed as electrical insulation The softening point minus 40°C on any sealing compound |
35 40 60 65 65 65 75 125 125 --- |
Wire wound cells Class 90 insulation 1/ Thermocouple method Resistance method Class 105 insulation 1/ Thermocouple method Resistance method Class 130 insulation 1/ Thermocouple method Resistance method Class "over 220" insulation 1/ |
50 70 65 85 85 105 No limit specified |
Single-layer series coils with exposed surfaces uninsulated or enameled Class 105 insulation 1/ Thermocouple method |
90 |
1/ Defined in IEC 60085, with pertinent information found in IEEE Standard 1 of the Institute of Electrical and Electronic Engineers.
3.14 Short-circuit interruption. When tested as specified in 4.7.11, circuit breakers shall clear the test circuit. The insulation of conductors used to wire the device shall not be damaged, the wire shall not be ejected from the wire connector and the leads shall not be burned off, shunts, bi-metals, or heaters shall not be burned out. The case shall not be broken, however, hairline cracks are acceptable, but cracks where a portion of the case is deflected outward (or inward) are not acceptable. Any hole or opening in the case caused by the short circuit operator is not
acceptable. A crack which would permit separation of two sections of the case is acceptable only if the two sections are caused to maintain their proper relative positions because of securing means such as mounting bolts, cover
screws, etc. Contacts shall not be welded and the fuse indicated in 4.7.3 shall not be ruptured.
3.15 250 percent calibration at 25°C ±3°C. When tested as specified in 4.7.12, each pole of the circuit breaker
6
For Parts Inquires submit RFQ to Parts Hangar, Inc.
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business