Overview
The Siemens 5SY4340-7 is a 3-pole miniature circuit breaker from the Sentron 5SY4 series, rated at 40 A, 400 VAC, with a C-curve trip characteristic and 10 kA interrupting capacity. It features combined terminals for flexible top or bottom feed, modular 3-unit width, and reliable protection for control panels, motor feeders, and three-phase circuits.
Key Features
• Brand: Siemens (Sentron 5SY4 series)
• Model: 5SY4340-7
• Poles: 3
• Current: 40 A
• Trip Curve: C-curve (for moderate inrush)
• Rated Voltage: 400 VAC (suitable for 480 VAC use in many cases)
• Interrupting Capacity: 10 kA 
• Width / Mounting: 3 modular units, DIN-rail mount 
• Condition: New Surplus
Applications
• Protection of industrial three-phase power circuits
• Motor control panels and feeder protection
• OEM replacement in control systems
• Reliable protection in environments with moderate startup surges
Overview
The Siemens 5SY4340-7 is a 3-pole miniature circuit breaker from the Sentron 5SY4 series, rated at 40 A, 400 VAC, with a C-curve trip characteristic and 10 kA interrupting capacity. It features combined terminals for flexible top or bottom feed, modular 3-unit width, and reliable protection for control panels, motor feeders, and three-phase circuits.
Key Features
• Brand: Siemens (Sentron 5SY4 series)
• Model: 5SY4340-7
• Poles: 3
• Current: 40 A
• Trip Curve: C-curve (for moderate inrush)
• Rated Voltage: 400 VAC (suitable for 480 VAC use in many cases)
• Interrupting Capacity: 10 kA 
• Width / Mounting: 3 modular units, DIN-rail mount 
• Condition: New Surplus
Applications
• Protection of industrial three-phase power circuits
• Motor control panels and feeder protection
• OEM replacement in control systems
• Reliable protection in environments with moderate startup surges
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