double-tier terminals
Double wiring density – two circuits, one terminal
Two-level terminal blocks are rail-mounted terminals with two independent, galvanically isolated connection levels stacked vertically. Where conventional single-level terminals take up significant DIN rail space, two-level terminal blocks combine two circuits in a single unit. This saves space, reduces wiring effort, and improves clarity inside the control cabinet. At WATT24 you'll find two-level terminal blocks as standard versions and PE protective conductor terminals for professional control cabinet assembly.
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What is a two-level terminal block?
A two-level terminal block is a rail-mounted terminal with two stacked connection levels in a single housing. Each level is electrically fully isolated from the other – there is no internal connection between the levels. The result: two independent circuits in the footprint of a single terminal.
Installation follows the same principle as standard rail terminals – on the 35 mm DIN rail (TS 35). Two-level terminal blocks are particularly useful wherever many conductors need to be organised and wired clearly in a confined space – for example in machine controls, building automation, or industrial plant wiring.
Two-level terminal blocks at a glance
| Type | Connection levels | Typical application |
|---|---|---|
| Two-level terminal (standard) | 2 × phase / neutral, galvanically isolated | Control wiring, terminal strips in control cabinets |
| Two-level terminal PE | 2 × protective conductor | PE distribution in control cabinets, compliant earthing |
When do two-level terminal blocks make sense?
Two-level terminal blocks are the right choice wherever multiple circuits need to be grouped in a single terminal block – and DIN rail space is at a premium. Typical applications:
- Machine controls: Many control cables in minimal space, clearly organised
- Building automation: Compact terminal strips for HVAC controls, lighting, blinds
- Industrial plant: Space-saving control cabinet layout for complex wiring
- PE distribution: Two-level PE terminals for standards-compliant protective conductor distribution
Frequently asked questions about two-level terminal blocks
Standard rail terminals have one connection level per unit. Two-level terminal blocks combine two independent levels in a single housing. You wire two circuits in the space of one terminal. The levels are galvanically isolated from each other; each level is an independent circuit.
Yes. Both levels are electrically fully isolated from one another. There is no internal connection between the levels – each level is an independent circuit that must be wired separately.
Two-level terminal blocks are mounted on the standard 35 mm DIN rail (DIN EN 60715, TS 35) – the common standard rail used in control cabinet assembly.
Yes. PE versions are lined up directly next to standard two-level terminals on the DIN rail. This creates a compact, standards-compliant terminal strip with integrated protective conductor connection.
Buy two-level terminal blocks at WATT24
At WATT24 you'll find two-level terminal blocks as standard versions and PE versions for professional control cabinet assembly – available for fast delivery at fair prices for electricians and commercial customers.