The Siemens 5SP3720-0 is a 1-pole main conductor circuit-breaker (SHU) rated 20 A at 230/400 V. It's a DIN-rail mounted device sized for panel distribution — the single-pole form factor fits into a standard modular enclosure alongside other SHU or MCB units, with the 20 A rating covering branch circuits feeding lighting, small motor starters, or control transformers up to that load.
Siemens 5SP3720-0 Main Conductor Circuit-Breaker, 1-Pole 20A
MPN5SP3720-0
Siemens SHU series main conductor circuit-breaker, 1-pole, E 20 A, 230/400 V, order code 5SP3720-0.
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026
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Frequently asked questions
What is the 5SP3720-0 used for?
It is a 1-pole main conductor circuit-breaker (SHU) rated 20 A at 230/400 V, used for branch-circuit protection in panel distribution.
MPN
5SP3720-0