Circuit Breakers

ABB offers the best solution for restoring the service condition rapidly in case of fault, providing at the same time optimum protection of the electrical installation. From the miniature circuit-breakers to the moulded-case and air circuit-breakers of the standard and high-breaking capacity type, with the ABB range, every technical problem has been solved. A reliable and advanced reply which, thanks to the interaction of electronics, is also present today in the control and operation stages of electrical installations.

Air circuit breakers can be used both as circuit-breakers for general protection (of plants, of user complexes, of electric lines) and as protection circuit breakers of electrical machines (generators, motors, transformers, capacitors).

They are used in all types of plants (civil, industrial, and in the service sector) as well as in the equipment on-board ships, in mines, in prefabricated substations, and for primary and secondary distribution in general.

Specific characteristics

All the SACE Emax circuit-breakers except for Emax X1, have the same height and depth both in the fixed and withdrawable version and allow construction of compact switchgear.

They are fitted with many features which mean the personnel can always work under conditions of maximum safety, such as racking-out with the door closed, degree of protection towards the outside up to IP54, an articulated series of safety locks and double insulation. The innovative structure of the pole guarantees complete insulation between phases and between phase and neutral and ensures full possibility of inspection of the arcing chamber and the main contacts.

SD Pocket is an innovative function which means a PC, even a hand-held one, can dialogue with Emax by means of the Bluetooth protocol. By means of the PC, and without any cables, the following is now possible, for example: the setting of the various protections, display of the measurements including those stored in the Data Logger, to verify the state of the circuit-breaker, know the number of operations carried out, etc..

Conformity with Standards

The SACE Emax circuit-breakers and their accessories are according to the international IEC 947, EN 60947 (harmonised in 28 countries of the CENELEC), CEI EN 60947 and IEC 1000 Standards and conform to the EC Directive:

  • Low Voltage Directives (LVD) no. 73/23 EEC
  • Electromagnetic Compatibility Directive (EMC) no. 89/336 EEC.
Furthermore, a series of SACE Emax circuit-breakers conforming to the UL 1066 Standards is available.

MCB´s protect installations against overload and short-circuit, warranting reliability and safety for operations.

New System pro M compact S200 series are current limiting over current protective devices. They have two different tripping mechanisms, the delayed thermal tripping mechanism for overload protection and the magnetic tripping mechanism for short circuit protection. They are available in different characteristics (B,C,D,K,Z), configurations (1P,1P+N,2P,3P,3P+N,4P), breaking capacities (up to 25 kA) and rated currents (up to 63A). Depending on the product range, New System pro M compact S200 series comply with

  • IEC/EN 60898-1
  • IEC/EN 60947-2
  • UL 1077
  • UL 489
  • CSA 22.2 No. 235
  • CSA 22.2 No. 5
allowing the use for residential, commercial and industrial applications.

Miniature circuit breakers (MCBs)

For domestic/residential installations in defined markets up to 6 kA breaking capacity 3 / 4,5 / 6 kA

  • Compact Home SH 200 T, SH 200 L, SH 200

For domestic or small commercial installations up to 10 kA breaking capacity

  • Pro M compact S200, S200S, S200 M

For industrial installations up to 25 kA breaking capacity

  • Pro M compact S200, S200M, S200P, S200U, S200UP, S200UDC
  • S280UC, S290

For commercial and industrial applications with high breaking capacities and special features / accessories

  • S200P, S220, S290
  • S500, S800

Special selective MCB (SMCB) with dedicated upstream and downstream selectivity are available in the ranges

  • S700
  • S750

ABB moulded-case circuit-breakers derive from two families of apparatus: the well-known and established Isomax S series and the recent but much awarded Tmax series. In particular, Tmax are characterized by an extremely high level of performances with limited overall dimensions, installation simplicity and an increasingly greater guarantee of safety for the operator thanks to their reinforced insulation. Tmax circuit-breakers, thanks to their performances, completeness of protection releases and accessories, can be used for all distribution and sub-distribution application for both AC and DC electrical plants.

Specific characteristics of Tmax

The Tmax series is characterized by being a product with a high technological content - the fruit of the most advanced design and simulation tools with excellent performances in minimum overall dimensions.

Thanks to the new technology used for the arcing chambers and the speed of contact opening, the circuit-breakers of the Tmax series guarantee strong limitation of the specific let-through energy and reduction in the peak currents, therefore limiting overheating of the devices and electro-dynamic stresses.

Furthermore, the new Tmax circuit-breakers use a completely common and standardized range of accessories with considerable advantages in terms of reduced stocks as well as flexibility and ease of use. Then within this range there are also the new residual current releases up to 500 A.

Field of application

The moulded-case circuit-breakers are used in industrial and civil low voltage plants with service currents from 1 to 1000 A. They are used in direct and alternating current distribution switchgear, for motor protection (Motor Control Center), generators, capacitors and for end users.