DEHNrail DR M 2P 255 Type 2 Surge Arrester, 2-Pole, 255 V AC, 40 kA, DIN Rail 953200

Protect your electrical installation from transient overvoltages with the DEHNrail DR M 2P 255 surge arrester. Designed for use in main distribution boards and sub-distribution panels, this 2-pole Type 2 surge protective device safeguards single-phase 230 V systems against surges caused by indirect lightning strikes or switching operations. Its compact design fits standard 35 mm DIN rails, making it suitable for residential, commercial, and industrial applications where reliable protection is essential.

Key specifications

• Type 2 surge protective device according to EN 61643-11
• Nominal voltage: 230 V AC (50/60 Hz)
• Max. continuous operating voltage (Uc): 255 V AC
• Nominal discharge current (In): 20 kA (8/20 µs)
• Max. discharge current (Imax): 40 kA (8/20 µs)
• Voltage protection level (Up): ≤ 1.2 kV
• Number of poles: 2
• Protection path: L-N
• Response time: ≤ 25 ns
• Mounting: 35 mm DIN rail
• Degree of protection: IP20
• Operating temperature range: -40 °C to +80 °C
• Connection cross-section: 1.5–35 mm² solid, 1.5–25 mm² stranded
• Integrated thermal disconnector with visual fault indication (green/red)
• Short-circuit withstand capability: 25 kA
• Max. mains-side overcurrent protection: 125 A gG
• Housing material: thermoplastic, UL 94 V-0

Why choose it

The DEHNrail DR M 2P 255 combines high discharge capacity with a low voltage protection level, ensuring sensitive equipment is shielded from damaging surges. Its integrated disconnector and clear visual status indicator simplify maintenance, while the robust thermoplastic housing guarantees long-term reliability even in demanding environments.

Ideal use cases

• Protection of single-phase power supplies in residential buildings
• Surge protection for commercial and industrial control systems
• Installation in main distribution boards and sub-distribution panels
• Protection of equipment with high availability requirements, such as servers or medical devices

Good to know

This surge arrester is a Type 2 device, intended for installation downstream of the main breaker to protect against indirect surges. It must be installed by qualified personnel in accordance with local regulations. The device is maintenance-free and does not require replacement after a single surge event, thanks to its high discharge capacity.