Technical information

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1SDC210033D0202
Circuit-breakers for power distribution
Main characteristics
SACE Tmax XT moulded-case circuit-breakers are the ideal solution for all distribution levels, from
the main low voltage switchboard to the subswitchboards in the installation. They feature high
specific let-through current peak and energy limiting characteristics that allow the circuits and
equipment on the load side to be sized in an optimum way. SACE Tmax XT circuit-breakers with
thermomagnetic and electronic trip units protect against overloads, short-circuits, earth faults and
indirect contacts in low voltage distribution networks.
The SACE Tmax XT family of moulded-case circuit-breakers can be equipped with:
Q
thermomagnetic trip units
(G3.2)
, for direct and alternating current network protection, using the
physical properties of a bimetal and an electromagnet to detect the overloads and short-circuits;
Q
electronic trip units
(G3.4)
, for alternating current network protection. Releases with microproc-
essor technology obtain protection functions that make the operations extremely reliable and
accurate. The power required for operating them correctly is supplied straight from the current
sensors of the releases. This ensures that they trip even in single-phase conditions and on a level
with the minimum setting.
The electronic protection trip unit consists of:
– 3 or 4 current sensors (current transformers);
– a protection unit;
– an opening solenoid (built into the electronic trip unit).
Characteristics of Electronic trip units SACE Tmax XT
Operating temperature -25°C…+70°C
Relative humidity 98%
Self-supplied 0.2xIn (single phase)
(1) (2)
Auxiliary supply (where applicable) 24V DC ± 20%
Operating frequency 45…66Hz or 360…440Hz
Electromagnetic compatibility IEC 60947-2 Annex F
(1)
0.32 x In for Ekip N-LS/I
(2)
For 10A: 0.4In