Ri4Power Coupling switch section Coupling switch sections (also known as busbar couplings) separate or connect different busbar systems in low-voltage switchgear and controlgear assembly. In the Ri4Power modular system, these coupling switch sections are com- prised of a riser section and a circuit-breaker section for ACBs. If two busbar sections are connected with a coupling switch section, with one positioned above and one below the ACB, a separate riser section will not be required. Due to the similarity of the two section types, the following selection criteria are virtually identical to those for an ACB section. The following parameters must be known for dimensioning of the coupling switch sections for air circuit breakers (ACBs): The rated current of the circuit Inc which the coupling switch section must 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 In addition to the ACB, control and measurement equipment The design of the ACB: with a maximum heat loss of 50 W may be installed in the Rack-mounted or static installation coupling switch section. The number of poles in the coupling switch (with switched The size of the riser section is derived from the chosen main or unswitched neutral conductor) busbar system. The make and model of the ACB The mounting position of the ACB For busbar system types Maxi-PLS, a minimum enclosure The rated voltage of the circuit width of 200 mm should be chosen. For the busbar system The required short-circuit withstand capacity for the types Flat-PLS 60 and Flat-PLS 100, a minimum enclosure coupling switch. width of 300 mm or 400 mm should be chosen. With the rated current of the circuit, the protection category When choosing an enclosure width of 200 mm, the base/ and type of cooling, together with the make and model of plinth of the ACB section should be widened by 200 mm, the ACB, you can calculate the required unit size from and the riser section and the ACB section are positioned on Tables 29 – 34, see page 77. a shared base/plinth. Riser sections with a width of 300 mm With the choice of unit and other mechanical parameters, this or 400 mm are on separate enclosure base/plinths. produces the minimum size of the enclosure for the ACB sec- Coupling switch sections from the modular Ri4Power system tion. This information can likewise be found in Tables 29 – 34, are comprised of TS 8 enclosures with form-separated, see page 77. For enclosures with internal form separation, variable configuration with partial doors and inner compart- the minimum compartment height is derived from the rated mentalisation in a modular design and other required system voltage of the unit. accessories. Testing has verified that air circuit-breakers from ABB, Eaton, The mounting position of the ACB is divided into: Position VT (in front of door), i. e. the control components General Electric, Mitsubishi, Schneider Electric, Siemens and Terasaki may be used. The information provided in are facing outwards from the enclosure door, thus allowing the ACB to be operated without opening the enclosure Tables 29 – 34, see page 77 in the Appendix, apply to the door. choice of connection cross-sections. If Rittal has not made any particular stipulations regarding the required clearance Position HT (behind the door) means that the ACB includ- ing the control components are completely inside the at the sides, above and below the ACBs, the equipment manufacturer’s specifications should be observed. enclosure. This means that for some switchgear positioned in front of The main busbar system may optionally be installed in the the door, a version with a 600 mm enclosure depth would be roof, base or rear section at the top, centre or bottom. When possible, whereas for versions behind the door, only 800 mm using partial doors, front trim panels with a protection cate- deep enclosures are possible. A further restriction arises gory as per the technical specifications should be used for when using busbar systems in the rear section. Due to the the upper and lower termination of the modular equipment. set forward position of the connection kit of the busbar sys- tem in relation to the ACB, some versions might only be pos- The detailed configuration of the coupling switch sections can be found in the valid Ri4Power assembly instructions. sible in 800 mm deep enclosures, whereas with main busbar systems in the roof or base section, a 600 mm deep enclo- sure would also be possible. Rittal Technical System Catalogue/Power distribution 2 - 50
Technical System Catalogue Ri4Power
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