Siemens 5SJ4108-7HG40 Miniature Circuit Breaker 1P 8A C 14kA

The Siemens 5SJ4108-7HG40 is a single-pole SENTRON miniature circuit breaker with a C tripping characteristic and 8 A rated current at 40°C. Certified to UL 489, it delivers a short-circuit breaking capacity of 14 kA at 240 V AC for branch circuit protection in infrastructure and industrial installations. Its 18 mm width and DIN rail mounting suit compact panel builds across a wide range of environments.

Technical specifications:

• MLFB: 5SJ4108-7HG40
• Manufacturer: Siemens
• Product line: SENTRON
• Number of poles: 1 (1P)
• Tripping characteristic: C
• Rated current: 8 A at 40°C; 7.6 A at 50°C; 7.4 A at 55°C; 7.2 A at 60°C
• Breaking capacity: 15 kA (IEC 60947-2); 10 kA (EN 60898); 14 kA (UL 1077 / CSA C22.2 No. 235)
• Operating voltage AC (UL 489 / CSA): 240/120 V
• Operating voltage DC: 60 V max
• Insulation voltage: 440 V AC
• Instantaneous trip setting: 7.5 x In
• Power loss per pole: 2.6 W
• IP rating: IP 0 (handle area)
• Overvoltage category: 3; pollution degree: 3
• Ambient temperature (operation): -25°C to 55°C; storage: -40°C to 75°C
• Mechanical service life: 10,000 operating cycles
• Mounting: DIN rail, any position
• Dimensions (WxHxD): 18 x 90 x 70 mm
• Weight: 161 g
• Conductor cross-section: 0.75 to 25 mm² (finely stranded with core end processing)
• Terminal tightening torque: 3.5 N·m

Features and benefits:

• Halogen-free, silicon-free construction for clean installation environments
• Sealable handle with touch protection on the actuator
• Compatible with supplementary devices for extended functionality
• Combined terminals top and bottom for flexible conductor routing

Applications:

• Branch circuit protection in industrial and infrastructure control panels
• Single-phase circuit protection in UL 489 listed North American installations
• Equipment protection where moderate inrush currents require a C-curve device
• Panel building for industrial and commercial environments requiring UL or IEC compliance

Compliant with IEC/EN 60947-2, EN 60898, and UL 489. Part of the Siemens SENTRON range.

Also known as: Siemens 5SJ4108-7HG40, SENTRON 5SJ4 miniature circuit breaker, Siemens 1-pole C8 MCB UL 489.