The Siemens 5SP3740-0 is a 1-pole main conductor circuit-breaker (SHU) rated 40 A at 230/400 V. This is the E-characteristic version — the trip curve sits between B and K, designed for main feeder protection where moderate inrush from downstream loads is expected but not the high surge of motor-starting. It's a standard DIN-rail mount unit, sized for distribution boards and sub-distribution panels.
Siemens 5SP3740-0 SHU Circuit Breaker, 1-Pole, 40 A
MPN5SP3740-0
Siemens 5SP3740-0 SHU main conductor circuit-breaker, 1-pole, E 40 A, 230/400 V.
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026
Product details
Frequently asked questions
What is the 5SP3740-0's rating?
It is a 1-pole main conductor circuit-breaker (SHU) rated 40 A at 230/400 V with an E characteristic trip curve.
Where can I buy the 5SP3740-0?
Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time.
MPN
5SP3740-0