Siemens 5SY73407 MCB 3P C40 400V 6kA

The Siemens 5SY73407 is a 3-pole miniature circuit breaker (MCB) with C tripping characteristic, rated for 40 A and 400 V AC. It offers a breaking capacity of 6 kA and is designed for DIN rail mounting, making it suitable for protecting circuits in industrial and commercial installations.

Highlights

• 3-pole MCB with C characteristic for general circuit protection
• Rated current 40 A, voltage 400 V AC
• Breaking capacity 6 kA according to IEC 60898-1
• Compact 3-module width for DIN rail mounting

In daily use

This circuit breaker provides reliable overcurrent and short-circuit protection for three-phase circuits. Its screw terminals accept conductors from 0.75 to 35 mm², and it operates in ambient temperatures from -25 to +45 °C. The mechanical endurance of 20,000 cycles ensures long service life.

Full specifications

• Rated current: 40 A
• Number of poles: 3
• Tripping characteristic: C
• Rated voltage: 400 V AC
• Rated insulation voltage: 440 V
• Rated impulse withstand voltage: 4 kV
• Rated breaking capacity: 6 kA
• Frequency: 50/60 Hz
• Mounting type: DIN rail
• Terminal type: Screw terminals
• Conductor cross-section (solid/stranded): 0.75 - 35 mm²
• Electrical endurance: 10,000 cycles
• Mechanical endurance: 20,000 cycles
• Degree of protection: IP20 (terminals), IP40 (with enclosure)
• Ambient operating temperature: -25 to +45 °C
• Standard: IEC 60898-1
• Number of module units: 3

Final note

A robust and dependable MCB for three-phase circuit protection in demanding environments.