DEHNshield TT 2P 255 Type 1+2 Single Phase Arrester - 941110

Name: DEHNshield TT 2P 255 Type 1+2 Single Phase Arrester - 941110
Brand: Dehn
SKU: g63g6sxlje
Price: 335.04 GBP
Availability: InStock

The Dehn DEHNshield combined surge arrester employs type 1 and type 2 spark-gap technology in acco...

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Product Information

Full details

The DEHNshield TT 2P 255 (MPN 941110) is a high-performance surge arrester designed for residential and special applications to protect low-voltage electrical installations from surges, including those caused by direct lightning strikes. Its key benefit is providing combined Type 1 and Type 2 protection in a compact, single-module design. A potential caveat is its specific application within TN and TT system configurations.

All features

Model Part Number	941110
Brand	Dehn

Extended Product Information

FAQs

What is the primary function of the DEHNshield TT 2P 255?

The primary function is to protect low-voltage electrical installations and terminal equipment from surges and lightning strikes by diverting excess energy safely to the earth.

Is this device suitable for all types of electrical systems?

No, it is specifically designed for TN and TT system configurations with a nominal AC voltage of 230V.

What does 'Type 1+2' protection mean?

It means the device offers both Type 1 surge protection (for direct lightning strikes) and Type 2 surge protection (for indirect lightning effects and switching overvoltages) in a single unit.

Can I install this myself?

Installation should only be performed by a qualified electrician due to the high voltages involved and safety regulations.

How do I know if the arrester needs replacing?

The device typically has a visual indicator. If this indicator shows a fault (often red), or if the arrester has experienced a significant surge event, it should be inspected and likely replaced.

What is the maximum conductor size that can be connected?

For solid and stranded conductors, the maximum cross-section is 35mm². For flexible (fine-strand) conductors, it is 25mm².

What is the voltage protection level?

The voltage protection level is 1.5kV for L-N, N-PE, and overall.

Troubleshooting

Device indicator shows a fault (e.g., red)

The surge arrester has likely been activated due to a surge event or has reached the end of its service life. The device needs to be replaced by a qualified electrician.

Remote signaling contact not working

Check the wiring of the remote signaling contact to the monitoring system. Ensure the contact is properly connected and that the monitoring system is functioning correctly.

Device overheats

Overheating indicates a severe fault, possibly due to a continuous high-energy surge or incorrect installation. Immediately de-energize the circuit and have the device inspected and replaced by a qualified electrician.

Pros and Cons

Pros

Provides robust protection against lightning and surge events.
Compact design saves valuable space in electrical panels.
Combines two protection types (1 and 2) into one device.
Suitable for various earthing systems (TN and TT).
Includes features for easy status monitoring.

Cons

Requires professional installation by a qualified electrician.
Specific to AC power systems; not for DC applications.
Best suited for boundaries 0A to 2 of the lightning protection zone concept.
Voltage protection level of 1.5kV may not be suitable for all sensitive equipment without further cascading protection.

Setup, Compatibility & Care

Setup:

Ensure the main power supply is switched OFF before installation.
Mount the DEHNshield TT 2P 255 onto a 35mm DIN rail (top-hat rail) at the appropriate location within the distribution board, typically at the boundary between lightning protection zones.
Connect the conductors according to the system configuration (TN or TT). Refer to the product manual for specific wiring diagrams for L-N and N-PE connections.
Max. conductor cross-section for solid/stranded is 35mm², and for flexible (fine-strand) is 25mm².
Verify the connections and then restore power.

Compatibility:

System Configuration: Compatible with TN and TT systems.
Nominal Voltage: Designed for 230V AC systems.
Maximum Continuous Voltage: Suitable for systems with up to 255V AC.
Installation Location: Ideal for boundaries from 0A to 2 according to the lightning protection zone concept.

Care:

This device is maintenance-free under normal operating conditions.
Regularly check the visual indicator on the device for any signs of damage or malfunction (e.g., red indicator).
Periodically test the functionality of the remote signaling contact if integrated into a monitoring system.
Keep the area around the device clean and free from dust and debris.