ABB Selective main circuit breakers S750 series Applications

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