Miniature circuit breaker 230/400 V 10kA, 1-pole, B, 40 A
The Siemens 5SL4140-6CC is a 1-pole miniature circuit breaker rated 40 A, B-curve, with a breaking capacity of 10 kA at 230/400 V. The B-curve trips between 3 and 5 times rated current, so it's sized for resistive and light inductive loads — think lighting circuits, socket outlets, or small control transformers — not motor starts that would nuisance-trip a B-curve. The 10 kA SCCR at 400 V means it safely interrupts fault currents up to that level without cascading upstream, which is the standard for most commercial and light industrial distribution boards.
Lifecycle and compliance
Listed as Active (current production) by Siemens, so this is a standard catalog item — no end-of-life notice, no last-time-buy pressure. RoHS compliant since June 2013, with a REACH Article 33 declaration for lead (CAS 7439-92-1) above 0.1% w/w. The product class is B (return restricted), meaning Siemens directs inquiries through their partner or contact channel — standard for breakers sold through distribution.
Sourcing and fit
Part of the 5SL4 Basic Devices family, Group Code P310, Product Group 3822. Mounts on standard 35 mm DIN rail — snap-on, no tools needed. The 1-pole format takes one module width (17.5 mm). For volume or BOM-line sourcing, this is quoted to order against an RFQ; availability and current pricing confirmed at quote time.