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Circuit breakers

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Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001389
EISBN: 978-1-62708-215-0
...Abstract Abstract During routine quality control testing, small circuit breakers exhibited high contact resistance and, in some cases, insulation of the contacts by a surface film. The contacts were made of silver-refractory (tungsten or molybdenum) alloys. Infrared analysis revealed the film...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001385
EISBN: 978-1-62708-215-0
..., with the damaged insulation on the aluminum conductor, is shown in Fig. 5 . The insulation was melted to within a few millimetres (fractions of an inch) from the conduit shown by the arrow in Fig. 6 . While there was evidence of arcing between the aluminum conductor and the circuit breaker terminal...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001473
EISBN: 978-1-62708-229-7
... of main gear wheel and one rim after the accident. The alternator and the supply were connected to the works' busbars by separate circuit breakers. Protection for the alternator was provided by circulating current, negative phase sequence, and reverse power relays. A synchronising relay...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c0091538
EISBN: 978-1-62708-233-4
... contact fingers were mounted in each of the two slots of each retainer, and a bank of four to eight retainers held the electrical contacts for a typical circuit breaker system. When a retainer cracked, the usual consequences were open circuits across some contacts, short circuits, and arcing...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003523
EISBN: 978-1-62708-180-1
... conductors, causing the arced condition? Was the current flow between the conductors sufficient to trip a circuit breaker? Was current flow sufficient to heat the materials to sufficient temperature to cause a fire? Were sufficient combustible materials present to sustain a fire? Modeling...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006772
EISBN: 978-1-62708-295-2
... of the subject conductors the cause of the fire or the result of the fire? Could an existing fire have spread to the subject energized conductors, causing the arced condition? Was the current flow between the conductors sufficient to trip a circuit breaker? Was current flow sufficient to heat...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001363
EISBN: 978-1-62708-215-0
... failed and left the PTR. Most of the debris came to rest against a debris fence 90 m (300 ft) down the tunnel circuit. Damage to the wind tunnel was minimal; however, the rotor and hub were destroyed. The collective thrust bearing consisted of a pair of thin, 140 mm (5.5 in.) diam, angular contact...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003553
EISBN: 978-1-62708-180-1
... stress. Nine contact fingers were mounted in each of the two slots of each retainer, and a bank of four to eight retainers held the electrical contacts for a typical circuit breaker system. When a retainer cracked, the usual consequences were open circuits across some contacts, short circuits...