DEHN Combined Arrester - DV M TNC 255 FM
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Tameson UKDehn Ventil M Tnc 255 Fm Multipole Modular Type 1 And 2 - 951305
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Product Information
Full details
The DEHN DV M TNC 255 FM is a combined lightning current and surge arrester designed for power systems operating with TN-C and TN-C-S network configurations. It offers robust protection against direct lightning strikes and transient overvoltages, ensuring the safety of terminal equipment and low-voltage consumer installations. While providing a high level of protection, users should be aware of its specific network form requirements and the need for proper integration into existing electrical systems.
All features
| Model Part Number | DV M TNC 255 FM |
|---|---|
| Brand | DEHN |
Extended Product Information
FAQs
What is the main purpose of the DEHN DV M TNC 255 FM?
It serves as a combined lightning current and surge arrester to protect electrical installations and equipment from damage caused by direct lightning strikes and transient overvoltages.
Which network configurations does this arrester support?
It supports TN-C and TN-C-S network configurations.
What does 'Type 1 + 2' compliance mean?
It means the arrester meets the requirements for both Type 1 (lightning current discharge) and Type 2 (surge voltage protection) according to EN 61643-11 standards.
How do I know if the arrester needs replacement?
The pluggable protection modules have a visual indicator. If it shows red, the module needs to be replaced. It is also recommended to replace modules after a significant surge event.
What is RADAX Flow?
RADAX Flow is a technology used in the arrester for follow current limitation, which helps to extinguish the power arc after a surge and ensures the continued availability of the power supply.
Can I use this arrester in a TT system?
No, this specific model (DV M TNC 255 FM) is designed for TN-C and TN-C-S systems. Other DEHN arrester models are available for TT systems.
What is the maximum conductor cross-section that can be connected?
For solid and stranded conductors, the maximum cross-section is 50mm². For fine-stranded conductors, it is 35mm².
Troubleshooting
Visual indicator shows fault (red)
The protection module has been triggered or has reached its end of life. Replace the pluggable protection module. Ensure the correct module type is used.
Remote signalling not functioning
Check the wiring of the remote signalling contact. Ensure the control input on the connected device is functioning correctly. Verify that the arrester has not been triggered.
Overheating or unusual noise
Immediately de-energize the system and inspect the arrester and its connections. This could indicate a severe surge event or a faulty connection. Consult a qualified electrician.
Pros and Cons
Pros
- Provides dual protection (Type 1 + 2) against lightning and surge events.
- High capacity for lightning impulse current (75kA) and follow current (50kA).
- Modular and pluggable design simplifies maintenance and replacement.
- RADAX Flow technology ensures high system availability.
- Suitable for common TN-C and TN-C-S network configurations.
Cons
- Limited to specific network configurations (TN-C, TN-C-S).
- Requires careful consideration of upstream and downstream overcurrent protection.
- Degree of protection (IP20) means it should be installed in a protected enclosure.
Setup, Compatibility & Care
Setup:
- Ensure the power supply is de-energized before installation.
- Mount the base part of the arrester onto a 35 mm DIN rail.
- Connect the conductors according to the terminal markings (L, N, PE) and the relevant network configuration (TN-C or TN-C-S).
- Ensure correct polarity for all connections.
- Insert the pluggable protection modules into the base part.
- Connect the remote signalling wires if used.
- Ensure upstream and downstream overcurrent protection devices (fuses) are selected according to the specifications (max. 315A parallel, max. 125A series).
- Re-energize the system and check the visual indicator on the module.
Compatibility:
- Network Forms: Primarily designed for TN-C and TN-C-S systems.
- Voltage: Compatible with nominal AC voltages of 230V and maximum continuous AC voltage of 264V.
- Conductor Size: Supports solid and stranded conductors up to 50mm² and fine-stranded conductors up to 35mm².
Care:
- The DEHN DV M TNC 255 FM is a maintenance-free device.
- Regularly inspect the visual indicator on the protection modules. A red indicator signifies a fault or the need for replacement.
- Ensure the device remains free from dust and moisture, ideally installed within a control cabinet or enclosure.