Siemens Miniature circuit breaker, C-curve, 1+N-P, 230V, 10kA, 40A

Product Overview

The Siemens 5SL4540-7 is the Siemens SENTRON 5SL4 miniature circuit breaker, 1+N-pole, 40 A, with C tripping characteristic. It provides reliable overload and short-circuit protection for single-phase AC circuits and is suitable for residential, commercial and light-industrial distribution boards or control panels.

Key Features

• Miniature circuit breaker (MCB), 1+N-pole configuration
• Rated current: 40 A at standard reference temperature
• C-characteristic curve for circuits with moderate inrush currents
• Rated operational voltage: 230 V AC
• Short-circuit breaking capacity: 10 kA
• Neutral conductor switching included
• Screw terminals accepting 0.75 mm² to 25 mm² conductors
• Modular width: 2 units (approx. 36 mm)
• Sealable handle for lock-out and safety procedures
• Compatible with add-on accessories such as auxiliary and fault-signal contacts
• Touch-safe terminal design with halogen-free and silicone-free insulation materials

Technical Specifications

• Article Number: 5SL4540-7
• Poles: 1P + N (neutral switching)
• Rated Current (In): 40 A
• Rated Voltage: 230 V AC
• Tripping Curve: C characteristic
• Breaking Capacity: 10 kA
• Terminal Capacity: 0.75 … 25 mm² conductors
• Tightening Torque: 2.5 … 3.0 N·m
• Modular Width: 2 MW (approx. 36 mm)
• Dimensions: Height approx. 90 mm, depth approx. 76 mm
• Protection Rating: IP20 (with connected conductors)
• Ambient Temperature Range: –25 °C to +55 °C
• Mechanical Durability: Approximately 10,000 switching operations
• Material Properties: Halogen-free, silicone-free, touch-protected

Compliance & Certifications

• Designed according to international standards for miniature circuit breakers
• Part of the Siemens SENTRON modular protection range
• Suitable for global electrical distribution applications

Applications

The 5SL4540-7 is used for single-phase branch circuit protection in distribution boards supplying lighting circuits, power outlets, HVAC loads or general-purpose AC loads up to 40 A. Its 1+N-pole design ensures both phase and neutral conductors are switched, making it suitable for installations requiring enhanced safety and service flexibility.