What the 35 A / 230-400 V rating means for your panel
The 5SP3735-0: The 35 A rating on a 1-pole SHU breaker at 230/400 V means it is sized for a single-phase branch circuit drawing up to 35 A continuous. In a 230/400 V three-phase system, this pole protects one leg of a single-phase load or a line-to-neutral circuit. The SHU designation indicates it is a main conductor circuit breaker — not a supplementary protector or a motor-protective device — so it is intended for feeder or sub-feeder duty in a distribution board. If your BOM calls for a 1-pole 35 A SHU, this is the exact order code.
Lifecycle is marked current. Siemens continues to manufacture and support this order code. No phase-out or last-time-buy notice is on record.