The Siemens 5SL4440-6CC is a 4-pole miniature circuit breaker (MCB) from the 5SL4 Basic Devices family, rated for 40 A at 400 V with a 10 kA breaking capacity and a B tripping characteristic. The B-curve means it trips between 3 and 5 times rated current, making it suitable for resistive and general-purpose loads where inrush is modest — lighting circuits, small heaters, control transformers — rather than motor circuits with higher starting surges. The 10 kA breaking capacity at 400 V is the standard domestic and light-commercial fault level for this class; it safely interrupts a short-circuit fault up to that magnitude without welding the contacts or cascading damage upstream.
Siemens 5SL4440-6CC Miniature Circuit Breaker, 4-Pole B 40A
MPN5SL4440-6CC
Active
Siemens 5SL4 series, Basic Devices, miniature circuit breaker (MCB), 4-pole, B-curve, 40 A, 400 V, 10 kA breaking capacity.
StockContact for availability
MOQ1 pcs
Sourced new & surplus through independent channelsListing updated Jul 2026
Specifications
Specifications
| Parameter | Value |
|---|---|
| Group code | P310 |
| Product group | 3822 |
| Product class | B: return restricted, please contact your Siemens partner/contact |
| Series | Basic Devices |
| Export control regulations | AL : N / ECCN : N |
| Compliance with the substance restrictions according to RoHS directive | Since: 01-06-13 |
Product details
Frequently asked questions
What is the breaking capacity of the 5SL4440-6CC?
The 5SL4440-6CC has a 10 kA breaking capacity at 400 V, which is the standard fault-interruption level for miniature circuit breakers in domestic and light-commercial distribution boards.
MPN
5SL4440-6CC