Ri4Power Description of switchgear section types Air circuit-breaker sections The following parameters must be known for dimensioning of the air circuit-breaker sections (ACB): The rated current of the circuit Inc which the ACB outlet must be able to carry under the chosen conditions The rated diversity factor RDF for this outgoing feeder or the system The protection category of the enclosure and type of cooling The design of the ACB: Rack-mounted or static installation The number of poles in the ACB outgoing feeder (with switched or unswitched neutral conductor) The make and model of the ACB The mounting position of the ACB The rated voltage of the circuit The required short-circuit withstand capacity for the ACB outgoing feeder. With the rated current and the rated load factor of the circuit, the protection category and type of cooling, together with the In addition to the ACB, control and measurement equipment make and model of the ACB, you can calculate the required with a maximum heat loss of 50 W may be installed in the unit size from Tables 29 – 34, see page 77. ACB section. With the choice of unit and other mechanical parameters, ACB sections from the modular Ri4Power system are com- this produces the minimum size of the enclosure for the ACB prised of TS 8 enclosures with form-separated, variable con- outlet. This information can likewise be found in Tables 29 – 34, figuration with partial doors and inner compartmentalisation see page 77, in the Appendix. For enclosures with internal in a modular design and other required system accessories. form separation, the minimum compartment height is derived Testing has verified that air circuit-breakers from ABB, Eaton, from the rated voltage of the unit. General Electric, Mitsubishi, Schneider Electric, Siemens and Terasaki may be used. The information provided in The mounting position of the ACB is divided into: Tables 29 – 34, see page 77, apply to the choice of connec- Position VT (in front of door), i. e. the control components are facing outwards from the enclosure door, thus allowing tion cross-sections. If Rittal has not made any particular stipulations regarding the required clearance at the sides, the ACB to be operated without opening the enclosure door. above and below the ACBs, the equipment manufacturer’s specifications should be observed. Position HT (behind the door) means that the ACB includ- ing the control components are completely inside the The main busbar system may optionally be installed in the enclosure. roof, base or rear section at the top, centre or bottom. When This means that for some switchgear positioned in front of the using partial doors, front trim panels with a protection cate- door, a version with a 600 mm enclosure depth would be gory as per the technical specifications should be used for possible, whereas for versions behind the door, only 800 mm the upper and lower termination of the modular equipment. deep enclosures are possible. A further restriction arises The cable connection system as an incoming/outgoing cir- when using busbar systems in the rear section. Due to the cuit, 3/4 pole, with compact, square profile is installed in a set forward position of the connection kit of the main busbar stepped arrangement above and/or below the ACB. system in relation to the ACB, some versions might only be The detailed configuration of the ACB sections can be found possible in 800 mm deep enclosures, whereas with main in the valid Ri4Power assembly instructions. busbar systems in the roof or base section, a 600 mm deep enclosure would also be possible. 2 - 49 Rittal Technical System Catalogue/Power distribution
Technical System Catalogue Ri4Power
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