DEHN DG MP TNS 275 Type 2 Surge Protective Device 4-Pole 275V AC 20kA

Type 2 surge protective device engineered for TN-S power systems, delivering a maximum discharge current of 40 kA (8/20 µs) to shield electrical installations from transient overvoltages. Its 4-pole configuration (3P+N) and 275 V AC continuous operating voltage make it a robust barrier against lightning-induced surges and switching operations.

Advantages

The DEHNguard MP TNS 275 combines high discharge capacity with a fast response time of ≤25 ns, ensuring sensitive equipment is protected before surge energy can cause damage. An integrated thermal disconnector and visual fault indicator (green/red flag) simplify maintenance and status checks. The compact, thermoplastic housing (UL 94 V-0) mounts on a standard 35 mm DIN rail, fitting seamlessly into distribution boards.

Suitable for

• TN-S three-phase power distribution systems
• Main distribution boards and sub-distribution panels
• Protection of industrial machinery, HVAC systems, and building automation
• Installations requiring compliance with IEC 61643-11 and EN 61643-11

Key specifications

• SPD type: Type 2 (class II) per IEC 61643-11
• System configuration: TN-S (3P+N)
• Number of poles: 4
• Max. continuous operating voltage (Uc): 275 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
• Response time (tA): ≤ 25 ns
• Short-circuit withstand capability (Iscc): 50 kA (RMS)
• Operating temperature range: -40 °C to +80 °C
• Degree of protection: IP20
• Connection cross-section: 1.5 mm² solid to 25 mm² stranded
• Mounting: 35 mm DIN rail (EN 60715)
• Housing material: Thermoplastic, UL 94 V-0
• Fault indication: Visual (green/red flag)
• Certifications: CE, VDE

Recommendations

For optimal protection, install the DEHN DG MP TNS 275 as close as possible to the incoming power supply, ensuring proper equipotential bonding and coordination with upstream Type 1 SPDs where required. Regular inspection of the visual indicator is advised to confirm operational readiness.