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PM783F 3BDH000364R0001 3BDH000364R0002 ABB DCS AC700F CPU modular
PM783F 3BDH000364R0001 3BDH000364R0002 ABB DCS AC700F CPU modular
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The tables below give the selectivity values of short-circuit currents (in kA)
between pre-selected combinations of circuit-breakers, for voltages from 380
to 415 V. The tables cover the possible combinations of ABB SACE Emax air
circuit-breakers series, ABB SACE Isomax and Tmax moulded-case circuitbreakers series and the series of ABB modular circuit-breakers.
The values are obtained following particular rules which, if not respected, may
give selectivity values which in some cases may be much lower than those
given. Some of these guidelines are generally valid and are indicated below;
others refer exclusively to particular types of circuit-breakers and will be subject
to notes below the relevant table.
General rules:
• the function l of electronic releases (PR111-PR112-PR113, PR211/P-PR212/
P, PR221DS-PR222DS/P) of upstream breakers must be excluded (l3 in OFF);
• the magnetic trip of thermomagnetic (TM) or magnetic only (MO) breakers
positioned upstream must be ≥ 10·In and set to the maximum threshold;
• it is fundamentally important to verify that the setting adopted by the user for
the electronic and thermomagnetic releases of breakers positioned either
upstream or downstream do not cause intersections in the time-current curves.
Notes for the correct reading of the coordination tables:
The limit value of selectivity is obtained considering the lower among the given
value, the breaking capacity of the CB on the supply side and the breaking
capacity of the CB on the load side.
The letter T indicates total selectivity for the given combination, the corresponding
value in kA is obtained considering the lower of the downstream and upstream
circuit-breakers’ breaking capacities (Icu).
The following tables show the breaking capacities at 415Vac for SACE Emax,
Isomax and Tmax circuit-breakers.
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