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Customer application 25 January 2022

Spring Pressure Connection Technology in Switchgear Production – Fast, Safe and Compact

Control cabinets are essential components for smooth operation in both mechanical engineering and building systems. These two industries share a key requirement: As many components as possible must be accommodated in the smallest space. For switchgear manufacturers, this is often the deciding factor in selecting the compact TOPJOB® S Rail-Mount Terminal Blocks from WAGO.

Switchgear manufacturing in Germany is dominated by mid-sized companies. Saveen GmbH, located in Weisendorf in the Franconia region of Bavaria, currently has 23 employees. This young company has grown quickly in the past few years, as CEO Sebastian Wellein reports: “Five years ago, we started with six employees – now we’re planning a new building, because our current location is bursting at the seams.” A large number of the tenders come from the home- and building automation sector. The company also produces switchgear units for specialist mechanical engineering, including automotive suppliers. Around 400 control cabinets in total are manufactured by saveen each year.

At a Glance

Compact approach with double- and triple-deck terminal blocks
Spring pressure connection technology saves wiring time and eliminates production errors
Maintenance-free terminal blocks
Straightforward CAE and CAD data download

Saving Space in the Control Cabinet

Numerous components must be housed within control cabinets; in switchgear design, as in many other applications, space is at a premium. Especially in home and building automation, many outlets are necessary, and they have to be wired from the switchgear unit. It is not unusual to have more than 100 outlets per switchgear unit. Various components are connected, from the lights, to the drives for the blinds, to the fire damper. Saveen relies on rail-mount terminal blocks from WAGO’s TOPJOB® S Series for wiring components. “If the customer doesn’t specify another manufacturer and it’s up to us, we always use WAGO components,” emphasizes Wellein. The rail-mount terminal blocks are available for conductor cross-sections from 0.14 mm² to 25 mm². Very large cross-sections are used for the power supply, while signal conductor sizes are usually small. If only larger conductor sizes are needed, WAGO’s 285 Series High-Current Rail-Mount Terminal Blocks can be used. These allow connections of conductors up to 185 mm².

TOPJOB® S Rail-Mount Terminal Blocks are particularly compact so that many connections can be accommodated on one DIN-rail. For example, a through terminal block with a nominal cross-section of 1.5 mm² is only 4.2 mm wide. Each rail-mount terminal block can be connected to conductors one size over its rated cross-section and can be loaded with the nominal current of the larger conductor – in this case, conductors with a cross-section of 2.5 mm². In home and building automation, more and more building systems are being controlled directly from the switchgear unit. “However, no one budgets for a corresponding increase in control cabinet space,” says Wellein. “So we need to make the best use of the space available.” In such cases, saveen uses double- and triple-deck terminal blocks from WAGO, which allow two to three times as many connection points in the same amount of space.