SIEMENS MCB 40A 3-Pole C 5SY4340-7

The SIEMENS 5SY4340-7 is a high-quality miniature circuit breaker (MCB) designed for reliable protection of electrical installations. With a rated current of 40 A and 3 poles, it offers robust performance for industrial and commercial applications. This MCB features a C tripping characteristic, making it suitable for circuits with moderate inrush currents, such as lighting and motor loads.

Advantages

• Reliable protection against overloads and short circuits
• Compact design for easy installation on DIN rails
• High breaking capacity of 6 kA at 400 V AC
• Long mechanical and electrical service life of 10,000 cycles
• Compliant with IEC 60898-1 standard

Suitable for

• Industrial control panels
• Commercial building distribution boards
• Lighting circuits
• Motor protection (with appropriate coordination)

Key specifications

• Rated current: 40 A
• Number of poles: 3
• Tripping characteristic: C
• Rated switching capacity (Icn): 6 kA at 400 V AC
• Rated voltage (Ue): 400 V AC
• Frequency: 50/60 Hz
• Mounting type: DIN rail (35 mm)
• Degree of protection: IP20 (with connected conductors)
• Operating temperature range: -25 to +45 °C
• Standard: IEC 60898-1
• Energy limiting class: 3
• Rated insulation voltage (Ui): 440 V
• Rated impulse withstand voltage (Uimp): 4 kV
• Mechanical service life: 10,000 switching cycles
• Electrical service life: 10,000 switching cycles
• Terminal type: Screw terminals
• Conductor cross-section (solid): 0.75 - 35 mm²
• Conductor cross-section (flexible): 0.75 - 25 mm²
• Pollution degree: 3
• Overvoltage category: III

Recommendations

For optimal performance, ensure proper installation by a qualified electrician. Use appropriate wire sizes and torque settings as specified in the product manual. This MCB is designed for use in distribution boards with ambient temperatures within the specified range.