| 摘要 |
A vented enclosure for moulded case circuit breakers 11 includes a venting arrangement to permit release of internal pressure caused in use by short circuit fault conditions. The venting arrangement may be in the form of louvres (23, Fig 5) formed in the enclosure, or a blow out panel 15 or a flap mounted over an aperture formed in the enclosure 11, with the panel or flap being formed of synthetic plastics material. An line panelboard 10 for mounting the circuit breakers 11 is provided with a central vertical expansion chamber 12 located between two vertical stacks of juxtaposed plug-in circuit breakers 11. <IMAGE> |
