Commercial or technical designation of a manufacturer's product family sharing a common design and compatible characteristics.

Range of tasks and systems for which the manufacturer recommends the component.

Primary function of the device and its intended use as defined by its design and the manufacturer's documentation.

External horizontal dimension of the product between its outermost lateral points.

External vertical dimension of the product from its lowest to its highest point.

External distance between the foremost and rearmost surfaces of the product.

Mass of the product itself, excluding transport packaging, additional accessories, and external equipment.

Primary material from which the product is manufactured.

Primary visually perceived colour of the product's external surface.

Type of final surface finish of the product determining its appearance and service properties.

Installation arrangement permitted by the product design, such as wall-mounted, flush-mounted, floor-mounted, or another specified mounting type.

Method used to mechanically secure the product to a support, surface, or load-bearing structure.

Permissible spatial orientation of the component during installation and operation.

Position of the accessory relative to the host switching or protective device, independent of the general installation orientation.

Declared type or combined type of surge protective device according to the applicable SPD product standard.

Functional response of the SPD to an overvoltage: voltage limiting, voltage switching, or a combination of both.

Principal technologies or nonlinear protective components used by the product to limit or divert a surge overvoltage.

Constructional classification of an SPD by number of ports, for example one-port or two-port design according to the applicable standard.

Declared voltage protection level Up characterizing the limited voltage across the SPD during the specified standardized test.

Nominal discharge current In declared for the SPD for the specified standardized current impulse waveform.

Maximum discharge current Imax that the SPD is capable of withstanding for the specified standardized impulse waveform.

Impulse discharge current Iimp used to characterize the ability of the SPD to withstand a high-energy current impulse.

Declared total discharge current of a multipole or multimode SPD where the manufacturer specifies an overall value for the product.

Maximum voltage at which continuous operation of the product is permitted under the conditions declared by the manufacturer.

Voltage value assigned to the product by the manufacturer for specified application conditions and characteristics.

Current assigned to the product by the manufacturer for the declared operating and thermal conditions.

Voltage with reference to which the product's insulation clearances and dielectric properties are specified.

Peak value of an impulse voltage of specified waveform that the product insulation must withstand without breakdown.

Manufacturer-declared permissible short-circuit current value for the product or assembly under specified conditions.

Manufacturer-declared response time of the relevant protective function of the product to a surge impulse.

Declared behaviour of the SPD at end of life or after failure of a protective element, including open-circuit or short-circuit state where provided by design.

Declared connection topology of the SPD protective circuits defining their electrical connection to conductors of the protected system.

Degree of enclosure protection against access to hazardous parts and ingress of solid objects and water, designated by the IP code.

Minimum ambient temperature at which normal operation of the product is permitted.

Maximum ambient temperature at which normal operation of the product is permitted.

Minimum ambient temperature permitted during storage of the product while not in operation.

Maximum ambient temperature permitted during storage of the product while not in operation.

Indicates whether a thermal disconnector is provided to disconnect the protective element in the event of overheating, degradation, or the specified fault condition.

Indicates whether the product has a local visual or mechanical indicator of operating, fault, or end-of-life status.

Indicates whether the protective module or SPD cartridge can be replaced without replacing the complete base part of the product.

Indicates whether the CE marking is applied to the product where applicable.

Indicates declared compliance with the applicable general requirements and test methods of IEC 61643-01 for low-voltage surge protective devices.

Indicates whether product compliance with applicable RoHS restrictions on hazardous substances has been declared.

Indicates declared compliance with the applicable IEC 61643-11 requirements and test methods for SPDs connected to low-voltage AC systems.

Indicates whether the manufacturer declares compliance of the product with applicable REACH Regulation requirements.

SPD construction and installation type according to UL 1449 classification, distinct from IEC Type 1, Type 2, and Type 3 classification.