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PM645B 3BSE010535R1 ABB Processor module industrial control automation controller
PM645B 3BSE010535R1 ABB Processor module industrial control automation controller
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Each switch disconnector shall be protected by a coordinated device which
safeguards it against overcurrents, usually a circuit-breaker able to limit the
short-circuit current and the let-through energy values at levels acceptable for
the switch-disconnector.
As regards overload protection, the rated current of the circuit-breaker shall be
lower than or equal to the size of the disconnector to be protected.
Regarding Isomax and Tmax series switch disconnectors the coordination tables
show the circuit-breakers which can protect them against the indicated
prospective short-circuit currents values.
Regarding Emax series switch disconnectors it is necessary to verify that the
short-circuit current value at the installation point is lower than the short-time
withstand current Icw of the disconnector, and that the peak value is lower than
the making current value (Icm).
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