ABB TMAX XT Moulded Case Circuit Breakers (MCCB)

The new SACE Tmax XT go everywhere and fear no tests as they are made to respond successfully to all plant engineering requirements, from the standard ones to the most technologically advanced ones, thanks to the extraordinary fullness of their range. A complete offer up to 250A for distribution, for energy metering, for motor protection, for generator protection, for oversized neutral, as switch disconnectors and for any other needs. A new range of both thermomagnetic and electronic protection trip units, interchangeable right from the smallest frames. To say nothing of the new and large number of dedicated accessories available, even for special applications.

All that remains is for you to choose: XT1 and XT3 for building standard installations with ABB SACE’s unquestioned reliability and safety, whereas XT2 and XT4 for building technologically advanced installations with top of market performance.

Construction Characteristics

All the moulded-case circuit-breakers in the SACE Tmax XT family are realized in accordance with the following construction characteristics:

• double insulation
• positive operation
• isolation behaviour
• electromagnetic compatibility
• tropicalization
• impact and vibration resistance
• power supply from the top towards the bottom or vice versa;
• versatility of the installation. It is possible to mount the circuit-breaker in horizontal, vertical, or lying down position without any derating of the rated characteristics
• no nominal performance derating for use up to an altitude of 2000m. Above 2000m, the proper-ties of the atmosphere (composition of the air, dielectric strength, cooling power and pressure) change, having an impact on the main parameters which define the circuit-breaker. The table below gives the changes to the main performance parameters:

• The SACE Tmax XT circuit-breakers can be used in environments where the temperature is between -25°C and +70°C and stored in environments where the temperature is between -40°C and +70°C. To use temperatures other than 40°C
• different degrees of protection IP (International Protection)

(1) During the installation of electrical accessories

NC Not classifiable

Standards

The SACE Tmax XT circuit-breakers and their accessories are constructed in conformity with:

Standard(G6.1):– IEC 60947-2;

Directives(G6.2):

• EC “Low Voltage Directive” (LVD) N° 2006/95/EC (in replacement of 73/23/EEC and subse-quent amendments);
• EC “Electromagnetic Compatibility Directive” (EMC) 2004/108/CE

Naval Registers(G6.3) (ask ABB SACE for the versions available):

• Lloyd’s Register of Shipping, Germanischer Lloyd, Bureau Veritas, Rina, Det Norske Veritas, Russian Maritime Register of Shipping, ABS.Certification of conformity with the product Standards is carried out in the ABB SACE tests laboratory (accredited by SINAL) in respect of the EN 45011 European Standard, by the Italian certification body ACAE (Association for Certification of Electrical Apparatus), member of the European LOVAG organisation (Low Voltage Agreement Group) and by the Swedish certification body SEMKO belonging to the international IECEE organisation.

The SACE Tmax XT series has a hologram on the front, obtained using special anti-forgery techniques, a guarantee of the quality and genuineness of the circuit-breaker as an ABB SACE product.

Identification of the SACE Tmax XT circuit-breakers

The characteristics of the circuit-breaker are given on the rating nameplate on the front of the circuit-breaker, and on the side rating plate.

1. Name of the circuit-breaker and performance level(*)
2. In: rated current of the circuit-breaker(*)
3. Uimp: rated impulse withstand voltage(*)
4. Ui: insulation voltage(*)
5. Ics rated short-circuit duty breaking capacity(*)
6. Icu: rated ultimate short-circuit breaking capacity(*)
7. Ue: rated service voltage(*)
8. Symbol of isolation behaviour(*)
9. Reference Standard IEC 60947-2(*)
10. Serial number
11. Anti-forgery logo
12. Test pushbutton
13. CE marking
14. Utilisation Category
15. Reference Standard NEMA-AB1(*) In compliance with the IEC 60947-2 Standard

MCCB 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:

• 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;
• 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)

Ordering Information

Tmax XT1-4

TMA Thermomagnetic

TMD Magnetic Only

Ratings at 400V

XT1N : 36kA
XT2N : 36kA
XT3N : 36kA
XT4N : 36kA