ABB Haupt-Sicherungsautomaten Baureihe S 750 Kurzbeschreibung

Kurzbeschreibung

Selective main circuit breakers of the S 750 series fully comply with E DIN VDE 0641-21.

They operate voltage-independent, i.e. their function does not depend on auxilary source

(SHU). They are designed for mounting onto 40 mm busbar systems (4- or 5-pole, 5/10 mm x 12 mm).

Independant of current rating of S 750. short circuit discrimination of up to 10.000 A or even

higher is available for the downstream circuit-breakers.

The short-circuit capacity of the S 750 is 25 kA (system voltage 230/400 V AC) throughout the

entire range of rated current.

Due to its particular current-limiting selectivity features, STOTZ selective main circuit breakers

support downstream circuit-breakers in limiting the energy when a short circuit occurs, thus

reducing the load on the back-up fuse and the entire electrical installation.

STOTZ selective main circuit breakers are suitable to disconnect and release electric circuits.

STOTZ selective main circuit breakers can be operated by ordinary people. The contact

position is indicated clearly and unambiguously by (1) the position of the operating lever,

clearly identified by the 0-I positions, and (2) also by a separate position indicator

(RED = on, GREEN = off).

Selective main circuit breakers S 750 operate voltage-independent (VI) according to

E DIN VDE 0641-21. i.e. they do not need a control circuit to make or break a contact.

STOTZ selective main circuit breakers S 750 are available with

tripping characteristic E (E = Exact)

They are particularly suitable for the following applications:

● in the meter-mounting board as the main isolating device for the customer

●  in main distribution frames or switchgear as selective group or back-up breaker,

especially where a high degree of service safety is required, e.g. for “installations for

gathering of people”, in “medical locations” and for the supply of safety equipment.

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.