KYN61-40.5 Metal-Clad Withdrawable Switchgear

It follows the system voltage, not the capacity. A 35 kV nominal system needs 40.5 kV equipment, and KYN61-40.5 is the member of the series that covers that class; the others reach 24 kV at most. Typical places are the incomers, feeders and bus-ties of a 35 kV substation, the main intake substation of a large industrial park, and the step-up side of a wind or solar plant. Where the system is 10 kV and only the capacity is large, that is a rated-current question and KYN28A-12 or KYN550-12 fits better.

Because in a withdrawable cubicle that gap has to hold on its own. Once the truck is racked to test or isolated position, one side of the gap is live and the other is not, and the insulation rests on that gap. If the gap withstand were set equal to the to-earth withstand, a switching overvoltage would break the gap down first and the isolation would be lost. The standard therefore sets the gap a step higher: 118 kV against 95 kV at power frequency and 215 kV against 185 kV on impulse. This is a structural requirement rather than spare margin, so the two sets are read together during selection.

The 3000 mm option goes with an SF6 truck and 2800 mm is the standard configuration, so the depth follows from the breaker type rather than being specified freely. What matters is checking the civil work first: at 1400 wide and 2800 high, the switchroom depth has to take the cubicle, the front operating and maintenance space and the truck withdrawal travel together, and this is what binds first on 35 kV projects. Send the switchroom layout with clear height, craneage route and transport height limit and the depth can be settled during quotation.

That is this model range: 1250 to 2500 A. At 40.5 kV the current for a given power is lower than in a 10 kV system, so 2500 A already corresponds to a substantial capacity and the range covers ordinary projects. Where a circuit genuinely needs more, it becomes a busbar and cubicle recalculation — send the circuit rating and system data with the enquiry.

The functional compartments are closed off from one another by metal partitions, and each has its own independent pressure relief duct — independence is the point: if fault pressure arises inside one compartment it is vented through that compartment own duct and does not pass through the neighbouring ones. The enclosure itself is aluzinc steel, CNC sheet-metal formed and then joined with high-strength bolts and nuts and rivet nuts, with components powder coated or galvanised to the project requirement. This describes the cubicle structure; the page makes no claim about any test or classification status.

Three things give a preliminary scheme: the single-line diagram, system nominal voltage and rated current, and the system fault capacity. For a contract-grade quotation, add the cubicle count with each primary scheme, control supply type and voltage, metering and protection requirements, cable entry arrangement and cable sizes, communication interfaces, switchroom dimensions and any depth limit, and the standards and document list for the destination market.

Yes. Switchgear is supplied as equipment while an MV switchgear E-House or power module is supplied as an enclosure — the first is the panel itself, the second covers the enclosure, equipment layout, auxiliary systems and interface integration. A 40.5 kV line-up is large, so in-module arrangement, maintenance space and truck travel are calculated during module design. Where KYN61-40.5 goes inside as the primary equipment, ETENZ works all of that out and the delivery boundary is settled once at contract stage.