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Electrical Connection SMA Technologie AG
Page 44 SMC50A_60A-IEN073320 Installation Guide
6.4.3 The Line Circuit Breaker
Factors that Determine the Selection
Various factors should be taken into account when selecting line circuit breakers. These
include, for example:
• The type of cable used (conductor material and insulation)
• Ambient temperatures affect the cables (higher temperatures result in a reduced
maximum current load)
• Method of routing the cable (reduces the maximum current load)
• Bundling cables together (reduces the maximum current load)
• Loop impedance [Z] (in the event of a body contact this limits the current that can
flow and therefore determines the response behavior of the circuit breaker)
• Adequate separation between the circuit breakers to avoid excessive heating
•Selectivity
• Protection class of the connected load (VDE 0100, part 410, "Protection against
electric shock")
When installing the fuses, please always take the information in the manufacturer's
data sheets into account, e.g. in terms of installation distance and heat impact.
Also observe the following standards in all cases:
• DIN VDE 0298-4 (Cable routing and current-carrying capacity)
• DIN VDE 0100, part 430 (Protective measures; protection of cable and
cords against overcurrent)
• DIN VDE 0100, part 410 (Protective measures; protection against electric
shock)
• Country-specific standards applicable at the installation site