Teknomega PTB3121 grey single-pole four-way power terminal block for copper and aluminium conductors from 2.5 to 35 mm².
£5.01
The Teknomega PTB3121 is a high-quality single-pole, four-way power terminal block designed for safe, compact and efficient power distribution within industrial switchboards, electrical control panels and OEM machinery. Finished in a grey insulating body for phase or general power distribution, it accepts both copper and aluminium conductors up to 35 mm², making it an excellent choice for modern industrial electrical installations.
Manufactured using a robust PA66 UL94-V0 self-extinguishing insulating body, a tinned aluminium conductor and galvanised steel terminal screws, the PTB3121 delivers outstanding electrical conductivity, corrosion resistance and long-term reliability. The terminal is supplied pre-greased to minimise oxidation and simplify installation, while its compact DIN rail design helps maximise available panel space.
With a continuous current rating of 135 A for copper conductors and 120 A for aluminium conductors, together with a 1000 V AC / 1500 V DC insulation rating, the PTB3121 is ideal for industrial power distribution, automation systems and electrical panel building applications.
The Teknomega PTB3121 provides a secure, compact connection point for multiple high-current conductors, allowing efficient power distribution within industrial electrical panels while reducing wiring complexity and DIN rail space requirements. Its four-way configuration makes it particularly suitable for machine builders, switchboard manufacturers and OEM panel builders.
Its robust construction, mixed-conductor compatibility and compliance with recognised international standards ensure dependable long-term performance in demanding industrial environments.
| Current | 135 A |
|---|---|
| Phase | Single Phase |
| IP Rating | IP20 |
| Manufacturer | Teknomega |
| Series | PTB3 |
| Model | PTB3121 |
| Reference | PTB-2-35-G |
| Product type | Power terminal block |
| Number of poles | 1 |
| Connections | 4-way (2 input / 2 output) |
| Copper conductor size | 2.5 to 35 mm² |
| Aluminium conductor size | 2.5 to 35 mm² |
| Continuous thermal current (Cu) | 135 A |
| Continuous thermal current (Al) | 120 A |
| Short-time withstand current (Icw) | 4.2 kA (1 second) |
| Peak withstand current (Ipk) | 6.2 kA |
| Rated insulation voltage (Ui) | 1000 V AC / 1500 V DC |
| Rated impulse withstand voltage (Uimp) | 8 kV |
| Pollution degree | 3 |
| Comparative tracking index | 600 V |
| Protection rating | IP20 |
| Mounting | 35 mm DIN rail |
| Insulating material | PA66 UL94-V0 |
| Conductor material | Tinned aluminium |
| Screw material | Galvanised steel |
| Cable stripping length | 19 mm |
| Hex key size | 4 mm |
| Tightening torque | 3 Nm (2.5–16 mm²), 6 Nm (25–35 mm²) |
| Maximum operating temperature | +85 °C |
| Dimensions (H × W × D) | 47.4 × 27.3 × 40.3 mm |
| Weight | Approx. 0.043 kg |
| Standards | EN 60947-7-1, EN 61238-1-1 |
| HS Code | 85369095 |
The PTB3121 is used to distribute high-current conductors safely within industrial switchboards, electrical panels and automation systems.
The PTB3121 is a single-pole, four-way terminal block providing two input and two output conductor connections.
It accepts both copper and aluminium conductors from 2.5 mm² to 35 mm².
The terminal block is rated at 135 A for copper conductors and 120 A for aluminium conductors.
The PTB3121 clips directly onto a standard 35 mm DIN rail for fast installation inside electrical enclosures.
Teknomega PTB power terminal blocks are trusted throughout the electrical industry for their compact design, mixed-conductor compatibility and dependable performance in industrial power distribution applications.
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LED Controls is a specialist distributor of factory automation and industrial controls, supplying OEMs, machine builders, panel builders and end users throughout the UK and worldwide. As a trusted UK distributor for many of the world’s leading automation manufacturers, we provide industrial control products, technical expertise and bespoke automation solutions backed by outstanding customer service.
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...