Phoenix 3210570 PTTB 2,5 BU Double-Level Push-in Terminal Block

In control cabinets and distribution boxes, space is always at a premium, and wiring density keeps increasing. The Phoenix 3210570 PTTB 2,5 BU double-level terminal block tackles this challenge head-on by stacking two connection levels in the footprint of a single standard terminal. Its push-in technology lets you insert solid or stranded conductors with ferrules directly—no tools, no twisting, no lost screws—so panel building becomes faster and more reliable. The blue housing clearly identifies it as a neutral or special-function terminal, while the compact design leaves more room for other components on the DIN rail.

Who is it for

This terminal block is built for electrical panel builders, machine OEMs, and maintenance technicians who need to maximize wiring density without sacrificing ease of use. It suits industrial control systems, building automation, and any application where two separate circuits must be connected in a minimal space. If you work with 2.5 mm² conductors on NS 35 DIN rails and value tool-free wiring, this block will fit right into your workflow.

Main features

• Double-level design: two independent connection levels in one compact housing, doubling wiring density.
• Push-in connection: insert solid or stranded wires with ferrules directly—no screwdriver required, reducing assembly time.
• Four connection points: two per level, each accepting wires from 0.14 to 4 mm² (solid) or 0.14 to 2.5 mm² (stranded).
• Blue housing: standard colour for neutral or special-function terminals, aiding quick identification.
• High-quality insulation: polyamide (PA) with UL 94 V0 flammability rating for safety and durability.
• Wide temperature range: operates from -60 °C to 105 °C, suitable for harsh environments.
• Global approvals: IEC, UL, CSA, VDE, EAC—ensuring compliance across markets.

Specifications

• Brand: Phoenix Contact
• Model: PTTB 2,5 BU
• MPN: 3210570
• EAN: 4046356418997
• Type: Double-level terminal block
• Connection method: Push-in
• Colour: Blue
• Nominal cross section: 2.5 mm²
• Number of levels: 2
• Number of connections: 4 (2 per level)
• Nominal voltage (IEC): 500 V
• Nominal current (IEC): 22 A
• Wire size (solid): 0.14 - 4 mm² (26 - 12 AWG)
• Wire size (stranded): 0.14 - 2.5 mm² (26 - 12 AWG)
• Mounting: NS 35/7,5 and NS 35/15 DIN rail
• Housing material: Polyamide (PA)
• Flammability rating: UL 94 V0
• Stripping length: 10 mm
• Operating temperature: -60 °C to 105 °C
• Pollution degree: 3
• Degree of protection: IP20
• Standards: IEC 60947-7-1, UL, CSA, VDE, EAC

Tips

When using stranded wires, always fit ferrules to ensure a secure push-in connection and prevent strand breakage. For solid conductors, simply strip 10 mm and push straight in—the spring mechanism grips firmly. To release a wire, press the integrated orange pusher with a small screwdriver. Mount the block on a standard NS 35 DIN rail; it snaps on without tools. For high-vibration environments, verify that the push-in connection meets your specific requirements, as screw terminals may offer higher retention in extreme cases.