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OSB is easily identifiable by its characteristic wood strands. Oriented strand board (OSB), also known as flakeboard, sterling board and aspenite in British English, is a type of engineered lumber similar to particle board, formed by adding adhesives and then compressing layers of wood strands (flakes) in specific orientations. It was invented by Armin Elmendorf in California in 1963.
The traditional molded-case circuit breaker uses electromechanical (thermal magnetic) trip units that may be fixed or interchangeable. An MCCB provides protection by combining a temperature sensitive device with a current sensitive electromagnetic device.o stop this current flow quickly so that major damage can be prevented, the short circuit or instantaneous element of an MCCB is used. A typical time current curve for an instantaneous element, as shown in Fig. 2, shows that it will not initiate a trip until the fault current reaches or exceeds Point 1.