DEHNguard DG M TNS 275 Type 2 Surge Arrester 3+1-Pole 230/400 V AC

Type 2 surge protective device engineered for TNS power systems, delivering robust protection against transient overvoltages with a maximum discharge capacity of 40 kA per pole. The DEHNguard DG M TNS 275 combines three high-energy varistor paths for phase-to-neutral protection and a dedicated spark gap for neutral-to-earth, ensuring comprehensive defense for low-voltage installations.

Advantages

Integrated thermal disconnector guarantees safe isolation in the event of overload, while the visual status indicator (green/red) provides immediate condition monitoring. Its compact 4-module DIN-rail housing simplifies installation in distribution boards, and the high short-circuit withstand of 50 kA ensures reliability even under severe fault conditions.

Suitable for

• Three-phase + neutral (TNS) low-voltage power distribution systems
• Protection of sensitive electronic equipment in industrial and commercial facilities
• Installation at the service entrance or sub-distribution boards per IEC 61643-11
• Retrofit and new construction projects requiring Type 2 surge protection

Key specifications

• System configuration: TNS (3-phase + neutral + earth)
• Nominal voltage (U_n): 230 / 400 V AC
• Max continuous operating voltage (U_c): 275 V AC
• Nominal discharge current (I_n) (8/20 µs): 20 kA per pole
• Max discharge current (I_max) (8/20 µs): 40 kA per pole
• Voltage protection level (U_p) at I_n: ≤ 1.2 kV
• Response time (t_A): < 25 ns
• Short-circuit withstand capability (I_SCCR): 50 kA RMS
• Operating temperature range: -40 °C to +80 °C
• Degree of protection: IP20
• Standards compliance: IEC 61643-11 / EN 61643-11
• Max conductor cross-section: 35 mm² solid / 25 mm² stranded

Recommendations

For optimal protection, install the DEHNguard DG M TNS 275 as close as possible to the incoming supply, with conductors kept short and straight. Pair with upstream Type 1 arresters for lightning-prone areas and coordinate with downstream Type 3 devices to protect terminal equipment. Periodic inspection of the status indicator is advised to ensure continued functionality.