The modular surge arresters of the DEHNguard M ... CI family with their functional Red/Line design combine short-circuit protection and surge protection in a single protection module. The protective circuit with the arrester backup fuse integrated in the protection module, and the heavy-duty zinc oxide varistor in combination with the dual thermo dynamic control monitoring device, offer the advantage of easy installation and minimum space requirements.
Due to the integrated arrester backup fuse, the user does not have to worry about arrester-specific dimensioning requirements such as backup protection in the event of a short circuit and impulse current carrying capacity. The user has the possibility to implement space-saving surge protection measures in installations with short circuit currents up to 25 kA rms which covers all functions specified in installation standards. All circuits including the N-PE circuit feature an operating state indicator required in accordance with the IEC 60364-5-53 standard.
The ‘thermo dynamic control’ monitoring device not only evaluates the surface temperature of the heavy-duty varistor but also the intensity of the discharge current. The mechanical visual indication with green and red flags shows if every protective circuit is ready for operation, without the need for power. The visual indication indicates the activation of the monitoring device and the integrated arrester backup fuse.
Apart from the mechanical operating state/fault indication, the ...FM version of the arrester features a three-pole remote signalling terminal. With its floating changeover contact, the remote signal can be used as break or make contact according to the particular circuit concept.
A module locking system prevents the protection modules from becoming loose due to shock during transport or due to the enormous forces of discharge. The protection modules can be easily replaced without tools. To prevent incorrect insertion by the installer or user, every protective circuit of the multipole and single-pole SPDs is mechanically coded.
The mutlipole modular DEHNguard M ... CI family features multifunctional terminals on a standardised spacing of one module for connecting conductors and busbars, allowing easy wiring with other DIN-rail mounted devices. Thus, a variety of applications can be connected in series in accordance with IEC 60364-5-53 for optimal protection.
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