terminal blocks

The backbone of every terminal strip – standards-compliant, modular, DIN rail mounted

Rail-mounted terminal blocks are connection components for professional control cabinet assembly. They are mounted on the 35 mm DIN rail (TS 35), can be combined into terminal strips of any length, and form the basis of every standards-compliant wiring installation in control and power circuits. Unlike choc blocks or field-wiring connectors, rail-mounted terminals are designed for DIN rail installation – with defined rated currents, rated voltages, and connection technologies per IEC 60947-7-1. At WATT24 you'll find rail-mounted terminal blocks as standard screw terminals, protective conductor terminals (PE), and two-level and three-level terminals for space-saving wiring.

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What is a rail-mounted terminal block?

A rail-mounted terminal block is a DIN rail-mounted connection terminal for control cabinet assembly. It connects conductors electrically – in a standards-compliant, releasable manner, within defined electrical parameters (rated voltage, rated current, cross-section). The name comes from the way they are used: rail terminals are lined up into terminal strips – any number of terminals side by side on a DIN rail, closed off with end brackets and end plates.

Rail-mounted terminal blocks are not field connectors – they belong in the control cabinet. The governing standard is IEC 60947-7-1 (VDE 0611-1), which regulates rated voltage, rated current, insulation, and mechanical strength. Installation is on the 35 mm mounting rail (TS 35).

Important: Rail-mounted terminal blocks and feed-through connectors (such as WAGO 221 or similar junction connectors) are not the same thing. Rail terminals belong on the DIN rail inside the control cabinet – feed-through connectors belong in the junction box or field wiring.

Rail-mounted terminal block types at a glance

Type	Feature	Typical application
Standard rail terminal	Feed-through connection, single level	Control and power circuits of all kinds
Protective conductor terminal (PE)	Conductively connected to DIN rail, green-yellow	Standards-compliant PE distribution in control cabinets
Two-level terminal	Two galvanically isolated levels in one terminal	Space-saving wiring at high conductor density
Three-level terminal	Three galvanically isolated levels in one terminal	Maximum wiring density, complex switchgear installations

Selecting the right rail-mounted terminal block

Three criteria determine the right choice:

Conductor cross-section and rated current: The terminal must be rated for the cross-section and operating current of the circuit – from 0.5 mm² for control cables up to 95 mm² for power circuits
Terminal type: Standard for feed-through connections, PE terminal for protective conductors, multi-level terminals where DIN rail space is limited
Manufacturer system: Accessories such as bridges, marking carriers, and end plates are not cross-compatible between manufacturers – always use a single system throughout

Tip: Standard rail terminals, PE terminals, and multi-level terminals can be combined directly side by side on a single DIN rail within the same manufacturer system – for a compact, standards-compliant terminal strip in one run.

Frequently asked questions about rail-mounted terminal blocks

What is the difference between rail-mounted terminal blocks and feed-through connectors?

Rail-mounted terminal blocks are mounted on the 35 mm DIN rail and designed for professional control cabinet assembly per IEC 60947-7-1. Feed-through connectors (e.g. WAGO 221) are compact field connectors without a DIN rail – they connect conductors directly inside junction boxes or field wiring, without any control cabinet connection.

What types of rail-mounted terminal blocks are available?

The most common types are standard rail terminals (feed-through connection), protective conductor terminals (PE), two-level terminals (two galvanically isolated levels), and three-level terminals (three levels). Disconnect terminals, fuse terminals, and measuring terminals are also available for specific applications.

Which DIN rail is used for rail-mounted terminal blocks?

Rail-mounted terminal blocks are mounted on the standard 35 mm mounting rail (DIN EN 60715, TS 35) – the universally used standard rail in control cabinet assembly.

Can I combine rail-mounted terminal blocks from different manufacturers?

Not recommended. While all rail terminals mount on TS 35, pitch dimensions, accessories (end brackets, bridges, marking carriers) and partition plates are manufacturer-specific. Always use the same system within a single terminal strip.

Which standard applies to rail-mounted terminal blocks?

Rail-mounted terminal blocks for control cabinet use must comply with IEC 60947-7-1 (in Germany: VDE 0611-1). This standard governs rated voltage, rated current, creepage distances, insulation, and mechanical requirements.

Buy rail-mounted terminal blocks at WATT24

At WATT24 you'll find rail-mounted terminal blocks as standard screw terminals, protective conductor terminals, and two-level and three-level versions from proven manufacturers such as Phoenix Contact and WAGO – available for fast delivery at fair prices for electricians and commercial customers.

Questions about selection? Our team is happy to help – by phone, email, or via our contact form.

terminal blocks

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KATHRIN BRANDT

OMAR NASER

RAINER SEIDEL

What is a rail-mounted terminal block?

Rail-mounted terminal block types at a glance

Selecting the right rail-mounted terminal block

Frequently asked questions about rail-mounted terminal blocks

Buy rail-mounted terminal blocks at WATT24

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terminal blocks

Filter

Filter

Categories

KATHRIN BRANDT

OMAR NASER

RAINER SEIDEL

What is a rail-mounted terminal block?

Rail-mounted terminal block types at a glance

Selecting the right rail-mounted terminal block

Frequently asked questions about rail-mounted terminal blocks

Buy rail-mounted terminal blocks at WATT24