Combined current and overvoltage arrester

November 2004 Electrical Power & Protection Products & Solutions Smart Home Automation

The DEHNventil TT is a combined Class I lightning current arrester and Class II overvoltage arrester providing the same level of protection where previously up to 20 devices had to be installed and connected. The compact unit requires only 30% of the space of similar devices and no de-coupling inductance coils are necessary between the Class I and Class II arresters.

Easily installed in different types of power supply systems, DEHNventil TT makes calculations unnecessary. Its discharge capability meets protection level 1 in accordance with SABS, IEC, EN and VDE standards, the highest requirements of lightning protection at present. It is capable of protecting equipment, even in the case of a lightning strike with an intensity of 200 kA (10/350).

By using the encapsulated spark gap technology, safety distances to adjacent components within the distribution cabinet are unnecessary. Even at fault currents up to 25 kARMS a 35 A fuse will not trip when DEHNventil TT extinguishes the follow on current.

The combined current and overvoltage arrester has no leakage current. This allows direct use of the device upstream of the meter, and when testing the insulation, no disconnection is required. DEHNventil TT is compatible with other surge arresters in the DEHN RED/LINE family.

By using the twin terminals, connection is easy and inductive volt drop across long connection cables is avoided. An additional bus bar terminal at the output increases the combination possibilities with other DIN rail mounted components. LED indication is provided, or if required, the optional DEHNsignal DV remote monitoring module informs the user on the state of the protection, even when he is not on site.

All DEHNventil devices have an additional earth terminal. This allows a safe connection to the main earth bar as well as short connection to the protective earth conductor of the power supply system.

For more information contact Paul Van As, Surge Technology, 011 792 1303, [email protected], www.surgetek.co.za

Further reading:

Banking’s AI reckoning
Commercial (Industry) Surveillance Access Control & Identity Management Fire & Safety Perimeter Security, Alarms & Intruder Detection Information Security Asset Management News & Events Integrated Solutions Infrastructure Security Services & Risk Management Education (Industry) Entertainment and Hospitality (Industry) Financial (Industry) Healthcare (Industry) Industrial (Industry) Mining (Industry) Residential Estate (Industry) Retail (Industry) Transport (Industry) Conferences & Events Products & Solutions Associations Videos Training & Education Smart Home Automation Agriculture (Industry) Logistics (Industry) AI & Data Analytics Facilities & Building Management IoT & Automation Power Management
From agentic commerce disputes to quantum-powered risk modelling, SAS experts offer a ‘banker’s dozen,’ 13 industry-defining predictions that will separate institutions that master intelligent banking from those still struggling with the basics.

Read more...

---

South African businesses can alleviate energy price crisis
Electrical Power & Protection
While grid instability remains a concern, the immediate and most critical driver of South African commercial and industrial investment in renewable energy is the escalating cost of electricity.

Read more...

---

Identity-led security in banking
Secutel Technologies Access Control & Identity Management Products & Solutions
Traditional keys, cards, and siloed systems are no longer sufficient in a world where security, compliance, and operational efficiency must work together seamlessly. In 2026, the focus is firmly on smart access.

Read more...

---

Real-time modelling is the key to a resilient, bi-directional energy grid
Schneider Electric South Africa Electrical Power & Protection
Utilities and municipalities are facing a challenge as the country’s legacy power grid, engineered for one-way energy delivery from centralised suppliers to end-users, must rapidly evolve to meet a new paradigm.

Read more...

---

Shielding data centre growth from the looming power crunch
Schneider Electric South Africa Electrical Power & Protection
Today’s digital economy is placing unprecedented strain on the power grid. The good news is that these challenges are not insurmountable. By adopting proactive strategies such as alternative power sources, infrastructure planning and software, operators can secure capacity, build resilient facilities and scale sustainably.

Read more...

---

Circuit breaker innovations
Schneider Electric South Africa Electrical Power & Protection
Recent advancements in circuit breaker technology have seen a major step forward in setting new standards for efficiency and sustainability in data centres, industrial and commercial infrastructure.

Read more...

---

Common battery tester errors and what they mean
Comtest Electrical Power & Protection
Battery testers help quickly assess battery health, diagnose issues, and determine whether a battery needs a charge or replacement. This guide covers some of the most common battery tester errors, what they mean, and what can cause them.

Read more...

---

Cathodic protection design considerations that influence ESG outcomes
Omniflex Remote Monitoring Specialists Electrical Power & Protection
Major infrastructure like wharves, bridges, pipelines and tanks are at constant risk of corrosion. David Celine, managing director of cathodic protection specialist Omniflex, explains how CP system design can support ESG commitments, while simultaneously lowering costs and improving maintenance capabilities.

Read more...

---

Africa’s digital future – building critical power infrastructure for data centre leadership
Electrical Power & Protection
Africa’s digital economy is growing rapidly, and countries like South Africa, Nigeria and Kenya are leading the way. However, a major challenge remains. Sustainable and reliable power systems must form the backbone of Africa’s digital growth to ensure lasting success.

Read more...

---

Recovering condensate and waste heat
Electrical Power & Protection
According to Associated Energy Services, strong partnerships with thermal energy users optimise opportunities to benefit from condensate return. waste heat recovery and the prevention of system contamination.

Read more...

---