Siemens 5SL3340-7YA 5SL3 3P 40A 4.5kA 400V C-Curve Miniature Circuit Breaker

The Siemens 5SL3340-7YA is a three-pole miniature circuit breaker (MCB) from the SENTRON 5SL3 series, rated 40 A with a C tripping characteristic and 4.5 kA breaking capacity (IEC 60947-2 / EN 60898-1) at 400 V AC. Designed for overload and short-circuit protection of cables and equipment in final distribution circuits, it mounts on a standard 35 mm DIN rail and occupies 3 modular width unit(s).

Technical Specifications

Certifications & Standards

• IEC 60947-2
• EN 60898-1

Applications & Use Cases

The 5SL3340-7YA provides C-characteristic protection suited for mixed loads with moderate inrush such as motors, transformers and control circuits. At 40 A and 4.5 kA breaking capacity, it is dimensioned for final subcircuit protection in commercial, residential and light-industrial distribution boards conforming to IEC 60947-2.

DIN-rail mounting and 3-module width allow high-density installation in standard consumer units and panelboards. Halogen-free construction and sealable toggle support fire-safety and lock-out requirements in institutional and infrastructure applications.