Technical articles on electrical panels, low and medium voltage systems, standards, protection classes and field applications are published on the Devpan articles page. For corporate announcements and fair news, please visit our News page.
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Insulation Monitoring Device (IMD): Finding the First Fault in IT Systems
In an IT system the neutral is not earthed, so a first earth fault does not cause an interruption, yet the installation is left without a…
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Equipotential Bonding and Lightning Protection: The Panel Side Interface
Equipotential bonding brings every simultaneously accessible conductive part together through low impedance connections so that the potential difference between them approaches zero. In a lightning protection…
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Humidity and Condensation Control in Panels: Heater, Hygrostat and Ventilation
Condensation appears when a surface inside the enclosure falls below the dew point of the air. The remedy is to keep that surface above the dew…
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DC Distribution Board: Rectifier, Battery Bank and 110/220 VDC Supply
A DC distribution board, together with the rectifier and battery bank, forms the uninterrupted auxiliary supply that feeds breaker tripping, protection relays, control and monitoring circuits…
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Vacuum or SF6 Circuit Breaker? Medium Voltage Switching Technologies
The vacuum circuit breaker is the standard solution in medium voltage thanks to high switching endurance, low maintenance and the absence of greenhouse gas; SF6 breakers…
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Dry-Type or Oil-Immersed? Distribution Transformer Selection
A cast resin dry-type transformer can be installed indoors without additional fire measures and is simple to maintain; a hermetic oil-immersed unit of the same rating…
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Protection Relays and ANSI Codes: 50/51, 27/59 and 87 Functions
ANSI codes are the common language of protection functions: 50 instantaneous overcurrent, 51 inverse time overcurrent, 50N/51N earth fault, 27/59 under and overvoltage, 87 differential. Relay…
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NH Fuse Selection: gG and aM Characteristics and Size Classes
A gG NH fuse protects against both overload and short circuit and suits distribution circuits; an aM fuse protects only against short circuit, withstands motor starting…
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Switch-Disconnector, Disconnector and Fuse Switch: Differences and Selection
A disconnector only provides safe isolation with no load current; a switch-disconnector makes and breaks the rated current on load; a fuse switch adds short-circuit protection…
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