Specifications
SACE Isomax S.
The greatest project for moulded-case circuit-breakers
A single series for all applications
SACE Isomax S is a project which evolves continually and is today the largest and most complete family of low voltage moulded-case circuit-breakers on the market, able to fulfil all installation requirements, from the small user up to large industrial electrical power distribution plants.
Innovation, Technology and Quality have always been the main guides for ABB SACE in developing products and are at their in the SACE Isomax S series .the moulded-case circuit-breakers characterised by high quality, reliability, and performance under all conditions, simplicity of installation and safety of operation.The continual and constant evolution of the series has led to further extending the range of products, thereby making the SACE Isomax S offer increasingly complete over time.
The series, which is divided rationally into eight basic sizes from S1 to S8, does, in fact, consist of different ranges destined to fulfil any installation need in a specific and optimal way.
The completeness of the series can also be noted in better rationalisation of use: the overall dimensions, methods of installation and possibility of applying accessories are all the same, regardless of the type of range the circuit-breaker is placed in.
Great importance is also put on the microprocessor-based electronic releases (mounted on the circuitbreakers starting from 160A): SACE PR211/P, PR212/P and SACE PR212/MP (International ABB SACE Patent), specifically designed to actuate dedicated functions for motor starting and protection.
Thanks to innovative and state-of-the-art protection functions, they ensure reliability and precision and are unaffected by electromagnetic interference.
A basic characteristic of these types of releases is their ability to communicate and dialogue with the SACE SD-View 810 self-configuring software, thereby allowing full integration of the circuitbreakers in the management logics relative to electric network supervision and control systems.
A world of solutions for installation design engineering.
An answer to all requirements.
The SACE Isomax is divided into eight basic sizes, S1,S2, S3, S4, S5, S6, S7 and S8 with rated uninterrupted currents from 125 to 3200A.
The types of devices consist of: fixed, plug-in and withdrawable circuit-breakers with seven ultimate rated breaking capacity levels - from 16 to 200kA (380-415V) - identified by the letters:
B, N, S, H, L, V, X.
From this family, which is considered the common .nucleus., a series of dedicated ranges are configured, which keep the same installation characteristics and accessory application possibilities.
Within the series there are therefore circuit-breakers available for alternating and direct current distribution, current-limiting circuit-breakers, circuit-breakers for motor protection, switch-disconnectors,circuit-breakers for applications with voltages up to 1000V, and residual current circuitbreakers, as well as specific ranges (for motor protection and switch-disconnectors) complying with the American UL489 and CSA C22.2 Standards. This means wider application possibilities both in industrial and civil sectors. They can therefore be mounted in primary (Power Center) and secondary (Panel Board) distribution switchboards, for motor protection and control (Motor Control Center), in generators and for end users. Their performances are, however, of particular interest where critical situations arise (very high rated and fault currents), or where complex plant engineering solutions are needed (special coordination requirements and plant automation). They also guarantee total selectivity of the protections up to full breaking capacity of the circuit-breaker installed on the load side.
Centralised supervision and control systems
The reliability, efficiency and quality of a electrical power distribution service is considerably increased by constant supervision of users and all the parameters of the installation itself. The information regarding the installations is collected using microprocessor-based field components which can be mounted directly on board
the apparatus, such as the SACE PR212/P release, or using the devices in the SACE SD family. Moreover, the use of the SACE SD-View 810 software allows a simple personal computer to be converted into a work station for supervising and controlling electrical power distribution plants.
Alternating current
Circuit-breakers with thermomagnetic releases and circuit-breakers fitted with microprocessor-based SACE PR211/P, PR212/P releases are available for protection of alternating current networks.These feature an application field from 10 to 3200A and a rated voltage of 690V. Apart from the more generic applications,they are particularly suited to protection of generators, capacitors, transformers and machine tools.
Direct current
Pole connection in series allows applications in the most severe operating conditions and in any type of network (insulated, with earthed polarity, and with median point of the power supply earthed). The circuit-breakers for direct current with thermomagnetic releases are available for operating currents between 10A and 800 A, with rated voltages up to 750 V, with 3 poles in series, and 250 and 500V, with two poles in series.
The range for applications at 1000V in alternating current and direct current extends the use of the moulded-case circuit-breakers even further and is a good example of the continual evolution of the SACE Isomax S series. They are particularly suitable for installation in special ambients, such as mines, petrochemical plants and for electric traction.
ABB SACE proposes various solutions, which allow type 2 coordinations to be made for switching and protecting motors,from 0.37kW to 355kW.
It is possible to select either circuitbreakers suited just to protection against short-circuit, or circuit-breakers fitted with the new SACE PR212/MP electronic release, which is technologically advanced and has been specifically studied for motor protection. The latter integrates protection functions on
Double insulation
The double insulation technique consists of total separation between the power circuits and the auxiliary circuits and is a characteristic of all SACE Isomax S apparatus from size S3 up.
The housing of each electrical accessory is completely segregated from the power circuit, thus avoiding all risk of contact with live parts, thereby increasing operator safety conditions during management and inspection of the installations.
Moreover, the circuit-breaker has redundant insulation between the internal live parts, both regarding thickness of materials and the distances, which are greater than those required by the IEC Standards and are in accordance with American usage.
Positive operation
The operating lever always indicates the exact position of the circuit-breaker moving contacts, thereby guaranteeing safe and reliable indications (I = Closed; O = Open; yellow-green line = Open due to release trip). The circuit-breaker operating mechanism has free release, regardless of the pressure on the lever or the speed of operation. Release tripping automatically opens the moving contacts: to close them again, it is necessary to reset the operating mechanism by pushing the operating lever from the intermediate position to the lower limit of the open position.
For plug-in or withdrawable circuit-breakers, the moving part can only be detached from the fixed part with the circuit-breaker open (moving contacts separate from the relative fixed contacts).
Selectivity
The complete range of releases means that the protection functions of the apparatus can be coordinated according to current- type, time-type, energy-type or residual-current selectivity chains. It is therefore possible to isolate only the areas affected by the fault, ensuring maximum service continuity. Circuit-breakers in category B are available from 400 A up.
Possibility of inspection
With the circuit-breaker out of service, it is possible to check the state of the internal parts and live components of the circuit- breaker directly. The arcing chambers and the fixed and moving contacts are accessible simply by removing the circuit-breaker cover. The operation, facilitated by the limited number of components, reduces maintenance times and ensures a higher degree of safety
Construction characteristics
Distinctive features of the series
Isolation behaviour
In the open position, the circuit-breaker guarantees isolation of the circuit in compliance with the IEC 60947-2 Standard. For plug-in or withdrawable version circuit-breakers, in the rackedout or withdrawn position, the power and auxiliary circuits are isolated, ensuring that no parts are live. Under these conditions and by means of special connectors, it is possible to carry out blank tests, operating the circuit-breaker in complete safety. The redundant insulation distances guarantee the absence of leakage currents and dielectric strength in the event of any overvoltages between the input and output.
Racking-out with the door closed
This system, starting from 160 A, allows the circuit-breaker to be racked in and out with the compartment door closed, increasing operator safety and allowing construction of internal arc proof low voltage switchboards. Racking out can only take place with the circuit-breaker open, using a special rackingout crank handle supplied with the withdrawable version circuit-breaker.
Electromagnetic compatibility
By using SACE PR211/P, PR212/P, PR212/MP microprocessorbased overcurrent releases and SACE RC210, RC211, RC212 electronic residual-current releases, the absence of unwarranted trips is guaranteed even in the presence of interference caused by electronic equipment, atmospheric disturbance or discharges of electrical type. Furthermore, the apparatus does not generate interference with other electronic equipment in the vicinity of the installation. This is in compliance with the IEC60947-2 Appendix F, IEC 1000-4, EN 61000-4, EN 50081-1, EN 50081-2, EN 50082-1, EN 50082-2 European Directive No. 89/ 336 specifications regarding electromagnetic compatibility EMC.
Tropicalisation
The SACE Isomax S series of circuit-breakers and accessories comply with the strictest regulations For plug-in in hot-humid-saline climates (in compliance with climatograph 8 of the IEC 721-2-1 Standards), thanks to:
. insulating cases made of fibreglass-reinforced synthetic resins;
. anti-corrosion treatment on all main metal parts (C UNI 3564-65 environment);
. Fe/Zn 12 galvanisation (UNI ISO 2081), protected by a conversion layer consisting mainly of chromates (UNI ISO 4520).
Installation positions
The circuit-breaker can be installed in any position without any effect on its rated characteristics. In compliance with the IEC60947-2 Standards, SACE Isomax S circuit-breakers can be supplied through either top or bottom terminals, without jeopardizing operation of the apparatus.
They can be installed in switchboards, mounted directly on the base plate or on Din rails up to size S5.
Mounting on DIN rail up to 630 A
The brackets For plug-in onto standardised DIN EN 50022 rails for use S2 and DIN EN 50023 rails for fixing S4, S5 simplify assembly of the circuit-breakers up to 630 A in standard switchboards.
This allows standardised supporting structures to be used and facilitates the stage for S1, and constructing the switchboard metalwork structure.
Resistance to vibration
The circuit-breakers are unaffected by vibrations generated mechanically or due to electromagnetic effects, in compliance with the IEC 68-2-6 Standards and the strictest regulations of the major classification organisations:
. RINA
. DET Norske Veritas
. Lloyd.s Register of Shipping
. Germanischer Lloyd
. Bureau Veritas.
Degrees of protection
Different measures have been taken in SACE Isomax S circuitbreakers to achieve IP20 degree of protection for S3, fixed, plug-in and withdrawable version circuit-breaker, excluding the terminals, and IP30 for designing front parts of the circuit-breakers installed in switchboards.The fixed parts are always provided with IP20 degree of protection. It is possible to achieve IP54 degree of protection in accordance with the IEC 60529 Standard with the circuit-breaker installed in a switchboard fitted with rotary handle operating mechanism transmission on the compartment door and the special insulation gaskets which can be ordered separately
Operating temperature
SACE Isomax S circuit-breakers can be used in ambient conditions where the temperature in the surrounding atmosphere varies between -25 °C and +70 °C and stored in ambients with temperatures between -40 °C and +70 °C.
The circuit-breakers fitted with thermomagnetic overcurrent release have their thermal set for the reference temperature of +40 °C.
For temperatures between +40 °C and +70 °C, with the same setting, there is lowering of the thermal trip threshold due to the temperature-related behaviour of the bimetallic strip of the release itself.
For temperatures lower than +40 °C, on the other hand, there is an increase in the thermal trip threshold as indicated in the table on page 5/39.
The electronic microprocessor-based overcurrent releases do not undergo any variations in performance with changes in temperature but, in the case of temperatures higher than 40°C, the maximum setting of the protection against overloads (function L) must be reduced to take into consideration inertial phenomena that occur in the copper parts of the circuitbreaker through which the phase current passes (moving and fixed contacts, and connection terminals) which cause a decrease in the rated uninterrupted current as indicated in the table on page 5/34.
The performances of the circuit-breaker cannot be guaranteed for the above +70 °C.
To ensure service continuity of the installations, careful thought must be given as to how to keep the temperature within acceptable levels for a of all the various devices and not only the circuit-breakers. For example, forced ventilation in the switchboards and in the areas where they are installed may be necessary.
Altitude
Up to an altitude of 2000 m SACE Isomax S circuit-breaker the rated uninterrupted current. rated performances are unaffected.
As the altitude increases, the atmospheric properties change in terms of composition, dielectric strength, cooling capacity and pressure.
The circuit-breakers therefore undergo derating, which can basically be measured through the change in significant parameters such as the rated maximum operating voltage and
Construction characteristics
Modularity of the series SACE Isomax S
Starting from the fixed version circuit-breaker and by means of mounting the conversion kit, all the other versions which are used For temperatures various requirements are obtained.
The following are available:
. kit For temperatures from fixed circuit-breaker to moving part of a plug-in or withdrawable circuit-breaker
. conversion kit for temperatures connection terminals which make it possible to obtain front and rear terminals for operation or Aluminium cables, and front and rear terminals For example, bar terminals.
Various accessories are also available:
. shunt opening releases
. undervoltage releases
. auxiliary contacts
. position contacts
. the bracket for the fixing onto DIN EN 50022 rail for conversion circuit-breakers, DIN EN 50023 rail for the circuit-breakers
. direct action motor operator, with stored energy and with solenoid.
. rotary handle operating mechanisms directly on the circuitbreaker and with transmission on the compartment door
. residual-current releases
. accessories for Copper overcurrent releases such as the signalling, dialogue and actuation unit and external CTs.
. the fixed parts for flat or withdrawable circuit-breakers with front terminals for rear or for S1-S2 bars and rear terminals for S3-S4-S5 bars.