General
Terminal type	Double-stack terminal
Current and voltage ratings	Determined by inserted plug
Nominal voltage	250 V
Nominal current	10 A
Connection type	screw / plug connection
Connection position	Left
Cross section	0,2 - 4 mm²
Mounting method	NS 35/7,5, NS 35/15, NS 32
Colour	Grey

The double-tier terminal block UKK 3-MSTB-5.08 from Phoenix Contact is a component for secure and compact connection of electrical conductors in industrial installations. It enables the parallel connection of two conductors in a single component, with the current and voltage ratings determined by the inserted plug. The terminal block is designed for use in enclosures and control systems, where space-saving and structured cabling are important. The grey colour and compact design fit into standardised mounting environments.

Applications
This terminal block is suitable for applications in industrial electrotechnics, particularly in control and enclosure technology. It is used to connect multiple conductors in a compact arrangement, with the double-tier construction reducing the number of required components. Mounting is done on standard support rails such as NS 35/7.5, NS 35/15, or NS 32, enabling universal use in various enclosure environments.

Functions and Features in Detail
The terminal block features a screw and plug connection, making it suitable for both manual and automated assembly. The connections for the first and second tier are positioned on the left, ensuring a uniform cabling direction. The permissible cross-sections range from 0.2 mm² to 4 mm², covering a wide range of conductor cross-sections commonly used in industrial electrotechnics. The rated voltage is 250 V, and the rated current is 10 A, making the terminal block suitable for typical control and auxiliary circuits.

Technology Explained Simply
The double-tier construction allows two separate connections to be made within a single component, reducing the mounting area required in the enclosure. The current and voltage ratings are determined by the inserted plug, enabling flexible use without requiring any electrical modification to the terminal block itself. The terminal block is designed for mounting on standard support rails, which are widely used in industrial electrotechnics. The grey colour is standard in enclosure technology and supports visual structuring.

Compatibility and Accessories
The terminal block can be combined with various accessories that facilitate mounting and operation. These include, for example, toothed strips (ZB 5.08), which ensure secure conductor fixation, and insert bridges (EBL 2-5, EBL 3-5), which enable parallel connection of multiple terminal blocks. End caps (D-UKK 3-MSTB-5.08) and end caps (NS 35/7.5 CAP, NS 35/15 CAP) serve to seal and protect the terminal block series. Spacing plates (DP-UKK 3-MSTB-5.08) and passage terminals (DG-UKK 3-MSTB-5.08) expand mounting options. End holders such as E/UK 1 or CLIPFIX 35 support secure fixation of the terminal block on the support rail.

Mounting and Installation
Mounting is done on standard support rails NS 35/7.5, NS 35/15, or NS 32. The terminal block is clipped onto the rail using the integrated mounting tongue. Connections are made via screw and plug connections, with conductors having a cross-section from 0.2 mm² to 4 mm². The left-side positioning of the connections ensures a uniform cabling direction, simplifying maintenance and fault diagnosis.

Operational Advantages
The terminal block reduces space requirements in the enclosure due to its double-tier construction. The flexible use via the plug allows adaptation to different current and voltage ratings without replacing the terminal block. The use of standard support rails ensures universal mounting. Compatibility with accessories such as insert bridges and end caps enhances the functionality and safety of the installation.