Dehn DEHNrail M 4P 255 FM Type 3 Surge Arrester, 4-Pole, 8kA, 1.5kV

The Dehn DEHNrail M 4P 255 FM is a high-performance Type 3 surge arrester engineered for DIN rail mounting in electrical distribution boards. This 4-pole device is specifically designed to protect sensitive terminal equipment from transient overvoltages that can occur in low-voltage systems. By integrating a remote signaling contact, the unit allows for seamless integration into building management systems, providing real-time status monitoring and enhanced operational reliability for critical electronic infrastructure.

Advantages

The primary benefit of this surge arrester is its compact design, which saves valuable space within control cabinets while maintaining high protective capabilities. Its 4-pole configuration ensures comprehensive protection across multiple phases and neutral lines. The inclusion of a remote signaling contact simplifies maintenance by alerting users to the operational status of the device, thereby preventing unexpected downtime. Furthermore, its robust construction and precise voltage protection level make it a dependable solution for safeguarding delicate electronic components against electrical surges.

Suitable for

• Protection of sensitive electronic control systems
• Industrial automation and PLC equipment
• Building management and monitoring systems
• Low-voltage distribution boards

When it may not be suitable

This device is a Type 3 surge arrester and is not intended to serve as the primary protection against direct lightning strikes or high-energy surges at the building entrance. It should be installed as part of a coordinated protection system downstream from Type 1 or Type 2 arresters.

Key specifications

• Type: 3 surge arrester
• Poles: 4-pole
• Mounting: DIN rail
• Discharge capacity: 8kA
• Voltage protection level: 1.5kV
• Signaling: Integrated remote signaling contact

How to use

The device is designed for installation on a standard 35mm DIN rail. It should be connected in parallel with the equipment being protected, ensuring that the connection leads are kept as short as possible to maintain the effectiveness of the voltage protection. The remote signaling contact can be wired to a central monitoring system or an alarm indicator to provide immediate feedback on the device's health. Installation must be performed by a qualified electrician in accordance with local electrical safety regulations.

What to consider before purchase

• Verify that the system voltage matches the 255V rating
• Ensure there is sufficient space on the DIN rail
• Confirm that upstream Type 1 or Type 2 protection is already present
• Check if the remote signaling feature is compatible with your monitoring hardware

Usage recommendations

Regularly inspect the status indicator on the device to ensure it is functioning correctly. If the indicator shows a fault, the module should be replaced immediately to maintain continuous protection for your electronic systems.