DSSR122 48990001-NK ABB distributed control system industrial DCS module card

Description

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Back-up protection
The tables given provide the value (in kA, referring to the
breaking capacity according to the IEC 60947-2 Standard)
for which the back-up protection among the combination
of selected circuit-breakers is verified. The tables cover
the possible combinations between ABB SACE Tmax series
of moulded-case circuit-breakers and those between
the above-mentioned circuit-breakers and the ABB series
of modular circuit-breakers.
The values indicated in the tables refer to the voltage:
• Vn of 230/240 V AC for coordination with modular SN 201
circuit-breakers
• Vn of 400/415 V AC for all the other coordinations.
Selective protection
The tables given provide the value (in kA, referring to the
breaking capacity according to the IEC 60947-2 Standard)
for which the selective protection is verified among the
combination of selected circuit-breakers. The tables cover
the possible combinations between ABB SACE Tmax series
of moulded-case circuit-breakers, and the ABB series
of modular circuit-breakers. The values in the table
represent the maximum value obtainable of discrimination
between supply side circuit-breaker and load side circuitbreaker referring to the voltage:
• Vn of 230/240 V AC for the SN 201 circuit-breakers and Vn
of 400/415 V AC for the supply side circuit-breakers in
the coordination between MCB with the modular SN 201
circuit-breakers (see picture).
• Vn of 400/415 V AC for all the other coordinations.