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ABB Selective main circuit breakers S750 series Applications

From:ABB | author:Mr.Chen | Time :2025-08-04 | 5 view: | Share:

STOTZ selective main circuit breakers fully comply with

the requirements of the German utilities directive (Technical

Connection Requirements of Network Operators) concerning

the mandatory pre-meter isolation and protection functions.

For these applications, selective main circuit breakers:

− ensure load current carrying capability over a large

temperature range;

− protect cables in the case of functional overload;

− protect cables in the case of a short circuit;

− clear high short-circuit currents reliable;

− limit the let-through current and let-through energy also

in the case of selective short-circuit disconnection by

downstream mcb

− provide disconnection and re-connection of installation,

also by ordinary people;

− provide selectivity with respect to downstream

circuit-breakers and upstream fuses;

− ensure highest availibility of electrical power supply for the customer.

Special features of the

selective main circuit-breaker S 750

− High breaking capacity 25 kA at 230/400 V~

− High energy limitation

− Suitable to provide selective overcurrent protection

in meter boards and in main distribution frames

− Suitable for isolation of electric circuits

− Current-limiting selectivity

− Voltage independent function

− High isolation ability:

Ui = 690 V,

Uimp = 6 kV with a test voltage of 9.8 kV

Overvoltage category IV,

Pollution degree 3

− Easy assembly with screwless connection to busbars

and cables on the load side

− Input frame terminals for busbar feeding

up to 50 mm2/100 A

− Isolation function according to IEC 60364 and IEC 60664

− Additional contact position indicator

RED = ON / GREEN = OFF

− Lockable and sealable

− Can be operated by ordinary people

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