Siemens 5SV33444KK14 RCCB Type B+ 40A 30mA 4-Pole Residual Current Circuit Breaker

The Siemens 5SV33444KK14 is a high-performance Residual Current Circuit Breaker (RCCB) designed for demanding electrical installations. With Type B+ sensitivity, it provides reliable protection against sinusoidal AC, pulsating DC, and smooth DC residual currents, making it ideal for systems with frequency converters and modern electronic loads. This 4-pole (3P+N) device offers a rated current of 40 A and a rated residual current of 30 mA, ensuring safety for both personnel and equipment.

Advantages

Type B+ RCCB detects all types of fault currents, including smooth DC, which is essential for installations with variable frequency drives, UPS systems, and EV charging stations. The compact 4-module width design saves space in distribution boards. High short-circuit withstand capacity of 10 kA ensures robust performance under fault conditions.

Suitable for

• Industrial and commercial electrical systems with frequency converters
• Photovoltaic installations
• Electric vehicle charging infrastructure
• UPS and backup power systems
• Any installation requiring universal residual current protection

Key specifications

• Product Type: Residual Current Circuit Breaker (RCCB)
• Number of Poles: 4 (3P+N)
• RCD Type: Type B+
• Rated Current (In): 40 A
• Rated Residual Current (IΔn): 30 mA
• Rated Voltage (Ue): 400 V AC
• Rated Frequency: 50/60 Hz
• Rated Switching Capacity (Icn): 10 kA
• Surge Current Resistance: 3 kA
• Tripping Characteristic: Instantaneous
• Mounting Type: DIN rail
• Number of Modular Widths: 4
• Degree of Protection: IP20 (terminals), IP40 (with enclosure)
• Operating Temperature Range: -25 to +45 °C
• Standards: IEC 61008-1, EN 61008-1

Recommendations

For comprehensive protection in modern electrical systems, pair this RCCB with a compatible MCB or RCBO. Ensure proper installation by a qualified electrician. Always verify system compatibility before purchase.