Dehn DR M 2P 255 FM Surge Arrester Type 3, 230 V

The Dehn DR M 2P 255 FM is a high-performance Type 3 surge arrester engineered to provide reliable protection for sensitive electronic equipment in 230 V AC electrical systems. This two-pole device consists of a robust base part and a plug-in protection module, ensuring efficient operation and ease of maintenance. Designed for professional electrical installations, it utilizes a heavy-duty zinc oxide varistor and spark gap combination to deliver high discharge capacity, effectively safeguarding connected devices against transient overvoltages.

Advantages

The primary advantage of this surge arrester is its modular design, which allows for the quick and easy replacement of protection modules via a dedicated release button. The device features a clear visual status indicator, displaying green or red flags to signal the operating state or potential faults. Its compact, narrow form factor adheres to DIN 43880 standards, making it ideal for space-constrained distribution boards. Furthermore, the unit is vibration and shock-tested to ensure long-term durability and consistent performance in demanding environments.

Suitable for

• Protection of sensitive electronic devices in 230 V AC circuits
• Integration into professional electrical distribution systems
• Applications requiring energy coordination within the Red/Line product family
• Installations where remote signaling of surge protection status is necessary

When it may not be suitable

This device is specifically designed as a Type 3 surge arrester for fine protection and is not intended to serve as the primary lightning protection or coarse surge protection for an entire building. It should be used in conjunction with upstream Type 1 or Type 2 arresters to ensure a complete protection concept.

Key specifications

• Nominal voltage: 230 V AC
• Frequency range: 50-60 Hz
• Response time: 0.000025 ms
• Material: Durable red thermoplastic
• Dimensions: 18 mm width, 73 mm depth
• Weight: 84 g
• Certifications: CE, KEMA, VDE, UL, CSA

How to use

The Dehn DR M 2P 255 FM is designed for installation on standard DIN rails. The base part is mounted securely, and the plug-in protection module is inserted until it locks into place. The terminal connections allow for straightforward wiring into the electrical circuit. The integrated remote signaling contact can be connected to a monitoring system to provide real-time alerts regarding the status of the protection module. Always ensure the power is disconnected before performing any installation or maintenance tasks.

What to consider before purchase

• Verify that the system voltage matches the 230 V rating
• Ensure compatibility with existing Type 1 or Type 2 surge protection devices
• Check available space in the distribution board for the 18 mm wide module
• Confirm the need for remote signaling integration in your monitoring setup

Usage recommendations

Regularly inspect the visual indicator window on the front of the module to ensure the green flag is visible, indicating that the device is fully operational. If the red indicator appears, the protection module should be replaced immediately to maintain system safety.