W-C-375E
shall trip within the time specified in table II for the 200 percent rated current test. Circuit breakers shall also meet the requirements of the dielectric withstanding voltage test (see 3.12).
3.16 Crossover (current limiters or fuses). When tested as specified in 4.7.13, the current limiter or fuse shall remain intact and permanently open the circuit. The cotton or cheesecloth shall not be ignited, there shall be no evidence of damage to the circuit breaker enclosure and the fuse shall not be ruptured.
3.17 Crossover (dummy fuses). When tested as specified in 4.7.14, there shall be no evidence of damage to the circuit breaker case, ejection of wire, or burn off of leads; all poles shall trip automatically; shunts, bi-metals, and heaters shall not be burned open; and circuit breakers shall be capable of being reclosed.
3.18 Maximum interrupting capacity. When tested as specified in 4.7.15, the circuit breaker case shall show no evidence of damage, the current limiter or fuse within the circuit breaker shall remain intact and permanently open, the cotton shall not be ignited and fuse as specified in 4.7.3 shall not be open.
3.19 Maximum energy (applicable only if tests in 4.7.15(b) were not required). When tested as specified in 4.7.16, current limiters shall remain intact and permanently open, the circuit breaker shall show no evidence of physical damage, there shall be no ejection of wire or burned off leads and the fuse as specified in 4.7.3 shall not be open.
3.20 250 percent calibration at 25°C ±3°C. When tested as specified in 4.7.17, the tripping time shall not exceed the limits shown in table II for the 200 percent rated current test. Circuit breakers must also meet the requirements of the dielectric withstanding voltage test (see 3.12).
3.21 Marking. Circuit breaker marking shall include the manufacturer's part or catalog number, name or symbol, the current rating, voltage rating, and interrupt rating in rms symmetrical amperes regardless of whether it is a standard or high interrupt rating (see tables VIII and XV). When multiple interrupt and voltage ratings apply (see
table XVI), all the ratings shall be marked on the device. Additional circuit breaker and accessory marking shall be in accordance with UL 489. In addition, the Government PIN (see 3.1) may be marked on the device.
3.21.1 Underwriters Listed (UL Listed) mark. Circuit breakers which conform to UL 489 (see 4.5(b)) shall have the
UL Listed mark on each circuit breaker.
3.22 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or environmentally preferable materials should be used to the maximum extent possible, provided that the material meets or exceeds the operational and maintenance requirements, and promotes economically advantageous life cycle costs.
3.23 Pure tin. The use of pure tin, as an underplate or final finish, is prohibited both internally and externally. Tin content of (product) and solder shall not exceed 97 percent, by mass. Tin shall be alloyed with a minimum of 3 percent lead, by mass (see 6.4).
3.24 Workmanship. Circuit breakers shall be manufactured and processed in such a manner as to be uniform in quality and shall be free from loose terminals, cracked, or displaced parts, sharp edges, burrs, and other defects that will affect life, serviceability, or appearance.
4. QUALITY ASSURANCE PROVISIONS
4.1 Responsibility for inspection. Unless otherwise specified in the contract or purchase order, the supplier is responsible for the performance of all inspection requirements as specified herein. Except as otherwise specified in the contract or purchase order, the supplier may use his own or any other facilities suitable for the performance of the inspection requirements specified herein, unless disapproved by the Government. The Government reserves the
right to perform any of the inspections set forth in the specification where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements.
4.1.1 Test equipment and inspection facilities. Test equipment and inspection facilities shall be of sufficient accuracy, quality, and quantity to permit performance of the required inspection. The supplier shall establish calibration of inspection equipment to the satisfaction of the Government. Compliance with the requirements of NCSL Z540-3, ISO 10012 or equivalent system as approved by the qualifying activity.
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