Siemens 5SJ4118-7HG40 - 15A, Miniature Circuit Breaker (MCB)

Introducing the Siemens 5SJ4118-7HG40 — a 15A miniature circuit breaker (MCB) built for dependable overcurrent protection in demanding electrical systems. With a precise 15A rating, this MCB integrates seamlessly into panelboards, switchboards, control panels, and OEM equipment, delivering consistent performance where safety and reliability matter most.

Why this Siemens MCB stands out

• 15A current rating tailored for general-purpose circuits, lighting branches, and motor-related feeders in commercial and light-industrial settings.
• Compact, drop-in form factor designed for crowded panels and motor control centers, making replacements and upgrades straightforward.
• Thermal-magnetic trip mechanism ensures fast, predictable response to overloads and short circuits, helping protect wiring insulation and connected equipment.
• Reliable protection for diverse installations—suitable for panelboards, switchboards, control panels, and OEM assemblies where space efficiency and endurance are critical.
• Resettable safety means faulted circuits can be restored quickly after tripping, reducing downtime compared with fuse-based protection.

Ideal use cases

• Panelboards and switchboards in manufacturing lines, processing facilities, and built environments requiring steady overcurrent protection.
• Motor control centers (MCCs) and machine control panels where compact protection is essential to fit crowded enclosures.
• OEM equipment enclosures that demand a reliable, easy-to-service protective device with a consistent trip characteristic.
• Commercial wiring layouts with dense spacing, where a 15A circuit breaker preserves safety while staying space-efficient.

How it helps you operate smarter

• Minimized downtime through quick, reliable reset after fault clearance.
• Protection that helps prevent wiring damage and equipment faults by interrupting fault currents promptly.
• Consistent performance within Siemens protection offerings, simplifying maintenance and part availability for service teams.