Cembre 2509979 (2A120-4ESI) heavy-duty electrolytic copper transformer terminal for 630 mm² conductors with an extended barrel and electro-tinned finish.
£85.50
The Cembre 2509979, also identified as 2A120-4ESI, is a premium heavy-duty copper compression transformer terminal designed for terminating very large copper conductors in demanding industrial power distribution and utility applications. Manufactured from high-purity electrolytic copper with an electrolytic tin-plated finish, it delivers outstanding electrical conductivity, excellent corrosion resistance and long-term mechanical reliability.
Part of Cembre's proven 2A heavy-duty terminal range, this terminal incorporates an extended compression barrel without an inspection hole to maximise mechanical strength while preventing moisture ingress. The robust 4ESI transformer palm provides multiple fixing points for secure transformer and busbar connections where high-current performance is essential.
Designed for 630 mm² copper conductors, the 2A120-4ESI is ideally suited to transformers, substations, switchgear, industrial power distribution systems and medium-voltage installations up to 35 kV when installed using compatible Cembre compression tooling.
Heavy-duty copper transformer terminals are engineered to deliver low-resistance electrical connections while maintaining outstanding mechanical integrity under high-current operating conditions. Their extended barrel construction provides improved crimp performance and enhanced resistance to vibration, thermal cycling and mechanical loading.
The Cembre 2A range combines annealed electrolytic copper with electrolytic tin plating to provide dependable long-term performance in demanding indoor and outdoor electrical installations. The absence of an inspection hole further improves environmental protection by reducing moisture ingress into the crimped connection.
| Series | 2A Heavy Duty Copper Terminals |
|---|---|
| Manufacturer Part Number | 2509979 |
| Product type | Heavy-duty copper transformer terminal |
| Conductor size | 630 mm² |
| Terminal style | 4ESI transformer palm |
| Material | High-purity electrolytic copper |
| Surface finish | Electro-tinned |
| Connection type | Compression crimp |
| Inspection hole | None |
| Typical applications | Transformers, substations, switchgear and industrial power distribution |
| HS Code | 85369010 |
| Country of Manufacture | United Kingdom (includes NI) |
The Cembre 2509979 is a heavy-duty copper compression transformer terminal designed for terminating 630 mm² copper conductors in high-current industrial and utility electrical systems.
The alternative product reference is 2A120-4ESI.
The extended compression barrel improves both electrical conductivity and mechanical strength while providing a more secure crimp for large conductors.
The conductor is inserted into the barrel and permanently secured using the appropriate Cembre compression crimping tool and matching dies before the palm is bolted to the equipment terminal.
Typical applications include transformers, substations, switchgear, busbar systems and industrial power distribution equipment.
Cembre heavy-duty copper transformer terminals are trusted by electrical contractors, panel builders, OEMs and utility engineers for creating reliable, low-resistance conductor terminations in demanding industrial and power distribution applications.
● Service Agreements
Credit Accounts
Our service agreements are built to support long term procurement relationships. By working closely with engineering teams and procurement departments, we help streamline purchasing processes while ensuring consistent access to critical components and sourcing support when it matters most.
● frequently asked questions
At Led Controls Ltd we help engineers source the right automation and control gear with confidence. below are quick answers to what we are asked most often.
We supply all leading manfacturers in our industry. we offer next day delivery on most poplour products.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
● latest blog
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...