Technical information

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1SDC210033D0202

Accessories

Versions and types

Tmax XT automatic circuit-breakers are available in the following versions:

FIXED. Fixed circuit-breakers consist of a current-interrupting part connected to the trip unit, to

be installed on the back plate of the cubicle or on a DIN rail;

PLUG-IN. Plug-in circuit-breakers consist of a ﬁxed part that must be installed on the back plate

of the cubicle, and of a moving part, obtained from the ﬁxed circuit-breaker plus the relative kit

that converts it from the ﬁxed version into the moving part of the plug-in version;

WITHDRAWABLE. Withdrawable circuit-breakers consist of a ﬁxed part that must be installed

on the back plate of the cubicle equipped with side runners to allow the moving part to be eas-

ily racked out and in, winch is obtained from the ﬁxed circuit-breaker plus the relative kit that

converts it from the ﬁxed version into the withdrawable moving part. To obtain the withdrawable

version, a front accessory to be applied onto the front of the circuit-breaker must be ordered so

as to maintain the IP40 degree of protection over the entire isolation run of the circuit-breaker.

If the plug-in circuit-breaker is ﬁtted with electrical accessories, the appropriate connectors for isola-

tion of the relative auxiliary circuits must also be ordered on the other hand, for the withdrawable

version there are dedicated accessories, ﬁtted with connectors which allow automatic disconnec-

tion in the case of racking-out (consult the “connection of electrical accessories” section in the

Accessories chapter).

Starting from the ﬁxed version, SACE Tmax XT circuit-breakers can easily be converted into the

plug-in and withdrawable versions using the relative conversion kits.

The moving part can always be obtained in the required version, fully pre-engineered in the factory,

by ordering the ﬁxed circuit-breaker and the conversion kit at the same time.

Version

Fixed Plug-in Withdrawable

XT1

XT2

QQQ

XT3

XT4

QQQ

Fixed part of plug-in and withdrawable versions

The ﬁxed parts of the plug-in/withdrawable versions are available with front terminals (F) or with

horizontal or vertical rear terminals (HR/VR). The terminals are factory-mounted in the horizontal po-

sition. In case of need, the Customer can easily rotate the terminals into the vertical position. These

ﬁxed parts can be equipped with the same terminal, terminal-cover and phase separator kits used

for the ﬁxed circuit-breakers, using the proper adapter.

The ﬁxed parts of a plug-in/withdrawable circuit-breaker can be installed at a distance of 50mm

from the back of the panel or at 70mm as shown in the picture. Installation at 50mm is only compul-

sory in the case where rear vertical or horizontal terminals (HR/VR) are used.

Fixed circuit-breaker

Plug-in circuit-breaker

Withdrawable circuit-breaker

Fixing at 50mm

Fixing at 70mm