ABB Selective main circuit breakers S750 series Brief description

Selective main circuit breakers S 750 series The technology

Brief description

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 continuity of supply is required, e.g. for “installations for

gathering of people”, in “medical locations” and for the

supply of safety equipment.