Air circuit breakers are available for a large number of applications.
The new series of air circuit-breakers consists of five sizes (E1, E2, E3, E4 and E6) in the fixed and withdrawable versions, with rated uninterrupted currents from 800 to 6300 A and breaking capacities up to 150 kA at 415 V.
Power distribution AC
For protection in alternating current, the circuit-breakers are fitted with the new series of electronic releases which offer the following main characteristics:
(1) without intentional delays
Power distribution DC
The SACE Emax range of low voltage automatic circuit-breakers is being enriched by the new series SACE Emax DC of automatic circuit-breakers for direct current applications in compliance with the
international standard IEC60947-2.
Thanks to the exclusive technology of the new electronic SACE PR123/DC e PR122/DC the SACE Emax DC range allows to cover all installation and automatic protection needs up to 1000V / 5000A DC.
By connecting three breaking poles in series it is possible to achieve a rated voltage of 750V DC, while with four poles in series the limit rises 1000V DC.
The automatic circuit-breakers of SACE Emax DC range maintain the overall dimensions and fixing points of the standard range circuit-breakers; they can be fitted with the various terminal kits and all
accessories common to the SACE Emax range.
The withdrawable circuit-breakers should be used together with the special version fixed parts for applications at 750/1000 DC.
(1) without intentional delays
Full-size neutral conductor
The Emax range of automatic circuit-breakers with full-size neutral conductor is used in special applications where the presence of third harmonics on individual phases can lead to a very high current on the neutral conductor.
Typical applications include installations with loads having high harmonics distortion (computers and electronic devices in general), lighting systems with a large number of fluorescent lamps, systems with inverters and rectifiers, UPS, and systems for adjusting the speed of electric motors.
This range includes standard circuit-breakers with full-size neutral conductor in sizes E1, E2, E3. Models E4 and E6 are available in the "Full size" version up to rated currents of 6300A.
Models E4/f and E6/f are available in fixed and withdrawable four-pole versions. These models can all be fitted with all accessories available for the Emax range, with the exception, on the E6/f model, of the mechanical interlocks made using flexible wires and 15 external auxiliary contacts, which are therefore incompatible.
All the models can be fitted with all the available versions of electronic protection relays, in the standard version.
(1) without intentional delays
F = fixed
W = withdrawable
The switch-disconnectors are derived from the corresponding circuit-breakers, of which they keep the overall dimensions and the possibility of mounting the accessories.
This version only differs from the circuit-breakers in the absence of the overcurrent releases.
The circuit-breaker is available both in the fixed and withdrawable version, three-pole and four-pole. The switch-disconnectors, identified by the code "/MS", can be used according to the category of use AC-23A (Motor switching or other highly inductive loads) according to the IEC 60947-3 Standard. The electrical characteristics of the switch-disconnectors are given in the table below.
ACBs up to 1150 V AC
The SACE Emax circuit-breakers can be supplied, in a special version, for rated service voltages up to 1150 V in alternating current.
The circuit-breakers in this version are defined by the code of the standard range (rated service voltage up to 690 V AC) together with the code "/E" and are derived form the corresponding standard SACE Emax circuit-breakers of which they keep the versions and accessories. The range of SACE Emax circuit-breakers for applications up to 1150 V in alternating current is available in the fixed and withdrawable version both in the three-pole and four-pole version. The SACE Emax/E circuit-breakers are particularly suitable for installation in mines, petrochemical plants and in traction.
The electrical characteristics of the range are indicated in the table below.
Switch-disconnectors up to 1150 V AC
The range of apparatus for applications at 1150 V in alternating current (AC) is completed with the switch-disconnectors. These circuit-breakers are according to the international IEC 60947-3 Standard.
The circuit-breakers in this version are defined by the code of the standard range, where the rated service voltage is up to 690V AC, together with the code "/E", which therefore becomes SACE Emax/E MS and are derived from the corresponding standard SACE Emax switch-disconnectors.
The three-pole, four-pole versions fixed and withdrawable versions are available with the same dimensions, characteristics of mounting accessories and installation of the same standard circuit-breakers. All the accessories foreseen for the SACE Emax range can be used. Furthermore, for the withdrawable version circuit-breakers, the standard fixed parts can be used.
Switch-disconnectors up to 1000 V DC
ABB SACE has developed the range SACE Emax/E MS of switch-disconnectors for applications up to 1000V in direct current conforming with the international IEC60947-3 Standards. These non-automatic circuit-breakers are particularly suitable for being used as bus-ties or main isolators in direct current installations, such as for the applications regarding electric traction. The range allows all installation requirements up to 1000V DC / 3200A or up to 750V DC/ 4000A to be covered. They are available in the fixed and withdrawable and in the three-pole and four-pole version.
With connection of three interruption poles in series, the rated voltage is 750V DC, whereas with four poles in series, it is 1000V DC.
The switch-disconnectors of the SACE Emax/E MS range keep the overall dimensions and the fixing points of the standard range of circuit-breakers unaltered, can be fitted with the various terminal kits and all the accessories common to the SACE Emax range. Naturally they cannot be associated with the electronic releases, CT and relative accessories for determining the currents and protection for applications in alternating current.
The withdrawable circuit-breakers must be associated with the fixed parts in a special version for applications at 750/1000V DC.
UL ANSI Standards
ABB SACE’s position as a major player on all world markets, meant needing to consider the American Standards right from the initial stages of designing the Emax apparatus. All the sizes of the apparatus, both three- and four-pole, fixed and withdrawable are, in fact, approved according to the UL ANSI 1066 North American Standards. And the same is valid for the corresponding switch-disconnectors.
Information is taken from : http://www.abb.com/product/seitp329/9cf15f0e967bde44c1256fea002370be.aspx?productLanguage=us&country=IN&tabKey=6