Main risks

• Electric shock from contact with live parts, even after apparent disconnection (presence of residual energy, PV panels and inverters that continue to generate).
• Electric arc and ejection of sparks when opening direct-current circuits or withdrawing fuses under load.
• Fire or overheating due to incorrect selection of the fuse/protective device or loose connections.
• Equipment damage due to insufficient protection against overcurrents or overvoltages.
• Deterioration due to moisture, dust or corrosion that can cause unexpected failures.
• Burns when touching components that have operated at high load or after a trip.
• Risk of short-circuit due to reversed polarity or improper handling of terminals in renewable energy systems.

Safe use

• Verify that the fuse or protective device is compatible with the system: type (AC/DC), rated voltage and current, and breaking capacity as specified by the manufacturer.
• Before working, disconnect all energy sources (mains, inverter, batteries) and, in photovoltaic systems, cover or isolate the panels where possible; verify absence of voltage with a suitable instrument.
• Do not withdraw or insert fuses or open fuse holders under load unless the device is designed for that operation.
• Observe polarity in direct-current circuits and the installation direction indicated by the manufacturer.
• Use compatible fuse bases, fuse holders and isolators in good condition; avoid components that are damaged, cracked or show signs of arcing.
• Tighten terminals according to the manufacturer's instructions and avoid undersized or poorly stripped conductors.
• Do not bypass fuses or disable protections; if a device trips or a fuse blows, identify the cause before resetting or re-energising.
• Use insulated tools and appropriate personal protective equipment (insulating gloves, safety goggles) during handling.
• Keep the installation area clear and avoid combustible materials near parts that may heat up.

Storage and maintenance

• Store products in a dry, clean and ventilated place, away from moisture, dust and sources of heat or direct sunlight.
• Keep components in their original packaging until installation to protect contacts and calibrations.
• Carry out periodic inspections, looking for discolouration, burning smell, arc marks, corrosion or loosened terminals.
• Remove dust with a dry cloth; avoid solvents or water on surfaces and contacts.
• Replace without delay any blown fuse, damaged fuse holder or protective device with an end-of-life indicator; do not attempt to repair them.
• After storms, mains surges or short-circuits, check the condition of protective devices, especially surge protection.
• Check that connections remain tight over time, especially in installations subject to vibration or thermal cycling.

Restrictions on use

• Installation, modification and maintenance to be carried out by personnel qualified in electrical systems, especially in high-voltage or direct-current circuits.
• Do not use these products outside the voltage, current, frequency or temperature ranges specified by the manufacturer.
• Avoid use in environments with water, airborne dust or potentially explosive atmospheres if the device is not designed for it.
• Do not mix fuses of different characteristics in the same circuit or replace them with non-equivalent models.
• Do not handle with wet hands or with jewellery or exposed metallic items.
• Do not modify, drill or open sealed devices; replace the assembly if damaged.
• Keep these products out of the reach of children and people unfamiliar with their use.
• Do not work on photovoltaic installations during electrical storms or with modules exposed to direct light without appropriate safety measures.