Type 3 surge devices
Compact DIN rail design comprising of base and plug in protection module
High discharge current performance using varistor and spark gap circuit
Energy coordination with other Dehn Redline products in accordance with BS7671 amendment 1
Status indication using Thermo Dynamic Control for monitoring of the SPD
Tool less replacement of the plugs for repair and test functions

From DEHN, this Type 3 surge arrestor has a high discharge current performance using a varistor and spark gap combination. This DR Series class III surge arrestor has a compact DIN Rail mounting design. With a protection module that plugs into a base element, replacements for repair and test functions can be enacted without tooling.
The DR Series modular surge arrestor also features status indication using Thermo Dynamic Control for monitoring of the SPD.

• Protected to IP20
• UL 94 V-0 Thermoplastic Housing
• Energy coordination with other Dehn Redline products in accordance with BS7671 amendment 1

2 pole modular surge protection devices (SMDs) are used to protect electrical devices from voltage spikes. A class III (Type 3) device, this surge protector is typically used in distribution boards and is suitable for indoor use.

Voltage surges, often referred to as spikes or transients are typically caused by switching of fluorescent lights, fuses blowing or nearby lightning activity. The worst voltage spikes are usually caused by lightning strikes and can reach up to 6000V, with current surges of over 3000A. The maximum size of the let-through voltage and current inrush depends on the location within the building's wiring system. BS7671: 2011 Amendment 1 Sections 443 and 534 cover risk assessment and provides guidance on protection of electronic equipment for installation engineers to follow. The fullest information on lightning and surge protection comes from the BSEN 62305 series of standards.