DEHN DEHNshield DSH TT 2P 255 Type 1+2 Surge Arrester 941110

The DEHNshield DSH TT 2P 255 combines Type 1 and Type 2 surge protection in a single compact unit, eliminating the need for separate lightning current and surge arresters in TT and TN-S systems. Its integrated thermal disconnector and high follow current extinguishing capability make it a reliable choice for protecting electrical installations from transient overvoltages.

Highlights

• Type 1+2 combined surge protective device (SPD) for TT and TN-S earthing systems
• 2-pole design with 255 V AC maximum continuous operating voltage
• High discharge capacity: 12.5 kA impulse current (10/350 µs) per pole, 50 kA max discharge current (8/20 µs)
• Integrated thermal disconnector for safe disconnection at end of life
• No external backup fuse required up to 315 A (gG)
• Voltage protection level ≤ 1.5 kV for effective protection of downstream equipment

In daily use

Mount the DEHNshield on a standard 35 mm DIN rail and connect it to the supply. The device operates across a wide temperature range from -40 °C to +80 °C, making it suitable for diverse installation environments. With a response time of ≤ 100 ns, it reacts instantly to surge events, safeguarding sensitive electronics. The IP20 degree of protection is intended for installation within distribution boards or enclosures.

Full specifications

• SPD type: Type 1 + Type 2
• Earthing system: TT, TN-S
• Number of poles: 2
• Max. continuous operating voltage (Uc): 255 V AC
• Nominal discharge current (In) (8/20 µs): 20 kA
• Max. discharge current (Imax) (8/20 µs): 50 kA
• Impulse current (Iimp) (10/350 µs): 12.5 kA per pole
• Voltage protection level (Up): ≤ 1.5 kV
• Follow current extinguishing capability (Ifi): 100 A AC
• Response time (tA): ≤ 100 ns
• Operating temperature range: -40 °C to +80 °C
• Mounting type: 35 mm DIN rail
• Degree of protection: IP20
• Standards compliance: IEC 61643-11 / EN 61643-11
• Integrated backup fuse: No external backup fuse required up to 315 A (gG)
• Disconnector: Integrated thermal disconnector
• Short-circuit withstand capability (Isccr): 50 kA rms
• Max. conductor cross-section: 35 mm² (solid) / 25 mm² (stranded)

Final note

The DEHNshield DSH TT 2P 255 is a robust, all-in-one surge protection solution for TT and TN-S systems, offering high discharge capacity and reliable disconnection in a compact DIN-rail module.