DEHN DSH TT 255 Type 2 Surge Protective Device 1+1 Pole 230/400V 40kA DIN Rail 941310

With a maximum discharge current of 40 kA (8/20 µs), the DEHN DSH TT 255 delivers robust surge protection for TT and TN-S earthing systems. Its compact 1+1 pole design fits standard DIN rails, while the 255 V AC continuous operating voltage supports 230/400 V networks.

Overview

The DSH TT 255 is a Type 2 surge protective device engineered for residential and commercial electrical installations. It features a visual fault indicator (green/red) for quick status checks and operates across a wide temperature range from -40 to +80 °C. The red thermoplastic housing is flame-retardant, and the device is certified to CE, KEMA, VDE, and UL standards.

What stands out

• High discharge capacity: 20 kA nominal, 40 kA maximum
• Low voltage protection level: < 1.5 kV
• Compatible with TT and TN-S earthing systems
• Compact DIN rail mounting with terminal connections
• Visual green/red fault indication

Technical details

• Nominal input voltage: 230 / 400 V AC
• Max continuous operating voltage: 255 V AC
• Nominal discharge current (8/20 µs): 20 kA
• Max discharge current (8/20 µs): 40 kA
• Voltage protection level: < 1.5 kV
• Number of poles: 1+1
• AC input frequency: 50/60 Hz
• Connection type: Terminal
• Mounting type: DIN rail
• Protection class: IP20
• Operating temperature: -40 to +80 °C
• Certifications: CE, KEMA, VDE, UL
• Housing material: Thermoplastic, flame-retardant
• Dimensions: 72 mm width, 72 mm depth
• Weight: 480 g

Our verdict

A reliable Type 2 SPD with high surge capacity and clear visual indication, ideal for protecting sensitive equipment in TT and TN-S systems.