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DEHN Shield TNS 255 Combined Arrester - 941400

DEHN Shield TNS 255 Combined Arrester - 941400

The DEHNshield combined surge arrester is a multipole type 1 and type 2 spark-gap-based lightning ...

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eBayDEHN DSH TNS 255 TNS 12.5kA Surge Protection Device 4 pole DEHNshield
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£371.07
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Tameson UKDehn Shield Tns 255 Combined Arrester For Three-Phase Tn-S - 941400
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Product Information

Full details

This DEHN Shield TNS 255 Combined Arrester (941400) is designed for electricians and system integrators needing robust protection for low-voltage consumer installations against surges, including direct lightning strikes. Its key benefit is offering Type 1 and Type 2 protection in a single, highly compact module. A potential consideration is its specific application within TN-S systems.

All features

Model Part Number941400
BrandDEHN

Extended Product Information

FAQs

What type of surge protection does the DEHN Shield TNS 255 offer?

It offers combined Type 1 and Type 2 surge protection, capable of handling both lightning impulse currents and switching overvoltages.

What is the primary system configuration this arrester is designed for?

It is specifically designed for TN-S system configurations.

How compact is the DEHN Shield TNS 255?

It is very compact, utilizing spark gap technology that occupies only one standard modular spacing (1 module/pole width).

What is the maximum lightning current the device can withstand?

It can withstand a thunderstorm surge of 50 kA (10/350 µs).

Can this arrester protect terminal equipment?

Yes, it is designed to protect low-voltage consumer's installations and connected terminal equipment from surges.

How is the device mounted?

It is mounted on a standard 35 mm DIN rail (top hat rail).

What does the optic signaling indicate?

The optic signaling provides a visual indication of the device's operational status.

Troubleshooting

Device does not indicate operational status (optic indicator off).

Check all electrical connections for tightness and correct wiring. If the issue persists, the surge arrester may have operated due to a surge and might need replacement. Consult a qualified electrician.

Overheating of the device or connected wiring.

Immediately de-energize the system. Check for correct conductor cross-section usage and ensure connections are secure. If the problem persists, there may be an excessive surge or internal fault; professional inspection is required.

No surge protection effectiveness observed.

Verify that the device is correctly installed in a TN-S configuration and that all connections are properly made according to the manufacturer's specifications. Ensure the arrester has not been damaged.

Pros and Cons

Pros

  • Provides dual Type 1 and Type 2 surge protection.
  • Extremely space-efficient design fits into standard electrical panels.
  • High capacity to handle direct lightning strikes (50kA).
  • Reliable protection for sensitive electronic equipment.
  • Easy installation on DIN rails.

Cons

  • Primarily designed for TN-S system configurations.
  • Requires professional installation by a qualified electrician.
  • Optic signaling may require visual inspection to confirm status.
  • BULK BOX packaging might not be suitable for individual retail.

Setup, Compatibility & Care

Setup:

  1. Ensure the power supply to the installation is completely de-energized before commencing work.
  2. Mount the DEHN Shield TNS 255 onto a standard 35mm DIN rail within the distribution board.
  3. Connect the incoming power conductors (L1, L2, L3, N) to the designated terminals on the arrester.
  4. Connect the PE (Protective Earth) conductor to the designated terminal on the arrester and to the main earthing terminal.
  5. For TN-S systems, ensure the N and PE conductors are separate up to the point of connection with the arrester.
  6. Follow the wiring diagram provided by DEHN for correct pole configuration (4 poles for TN-S).
  7. The maximum conductor cross-section for solid/stranded wire is 35mm², and for fine-strand flexible wire is 25mm².
  8. Restore power only after all connections are verified and secure.

Compatibility:

  • System Configuration: Primarily designed for TN-S systems.
  • Nominal Voltage: Compatible with AC 230V systems.
  • Maximum Continuous Voltage: Operates safely up to AC 255V.
  • Mounting: Requires a standard 35mm top-hat DIN rail.

Care:

  • Regular visual inspection of the optic signaling indicator is recommended to ensure the device is operational.
  • Keep the area around the arrester clean and free from dust or debris.
  • No user-serviceable parts are inside. Maintenance should only be performed by qualified personnel.

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