Siemens 5SL31 MCB Series | 1-Pole, 4.5kA, C Curve, Single-Phase Residential & Commercial Modular Range

Siemens 5SL31 1-Pole 4.5kA C Curve Miniature Circuit Breaker (MCB) series represents the industry benchmark for safe, dependable, and highly cost-effective single-phase circuit protection in modern residential buildings, apartment complexes, and light commercial properties. Engineered to safeguard low-voltage branch circuits against hazardous thermal overloads and damaging short circuits, this premium modular range spans all industry-standard current ratings extending from 6A, 10A, 16A, 20A, 25A, 32A, 40A, 50A, up to 63A. Delivering a certified short-circuit breaking capacity of 4500A (4.5kA) under international code IEC/EN 60898-1, the 5SL31 family balances cost efficiency with top-tier safety.

Manufactured to rigid Siemens engineering and quality benchmarks, the 5SL31 single-pole series stands out in the Egyptian electrical trade for its compact build, advanced flame-retardant thermoplastics, and superior heat dissipation properties under continuous load cycles. The universal C-Curve trip profile is precision-calibrated to handle normal transient inductive starting current surges seamlessly—such as when refrigerator compressors, LED lighting driver banks, or household appliances kick in—preventing frustrating nuisance tripping. Equipped with Siemens' patented touch-safe tunnel terminals (IP20), this 18mm modular series ensures secure wire terminations, uniform consumer unit aesthetics, and lightning-fast DIN-rail installation.

Comprehensive Range Applications:

• 6A, 10A & 16A Models (e.g., 5SL3116-7): The default engineering standard for residential LED lighting strings, low-load control loops, and intercom systems.

• 20A & 25A Models (e.g., 5SL3120-7, 5SL3125-7): Dedicated protection for general-purpose wall sockets, kitchen appliance rings, deep freezers, and home utility loops.

• 32A & 40A Models (e.g., 5SL3132-7, 5SL3140-7): Optimized safety feeders for domestic water heaters, single-phase water pumps, and standard bedroom air conditioners.

• 50A & 63A Models (e.g., 5SL3163-7): High-capacity single-pole feeders or modular incomers for complete residential sub-panels and administrative office lines.

Key Technical Advantages:

• 4.5kA Certified Protection: Optimally calibrated to safely interrupt short-circuit faults in standard residential and light commercial networks.

• German Engineering Pedigree: Unmatched internal contact reliability ensures an extended electrical and mechanical service lifespan under continuous duty.

• Ergonomic Square Terminals: Double-terminal architecture allows simultaneous connection of standardized pin-type comb busbars and flexible copper cables up to 35 mm.

• Tool-Free Slide Removal: Advanced rear snap-on tracking clips allow easy removal of an individual circuit breaker from the middle of an assembled row without disturbing adjacent units.