Siemens SENTRON 5SV36448 Residual Current Circuit Breaker, Type A, 40 A, 300 mA, 4-pole, 400 V, Selective

Residual current circuit breakers (RCCBs) protect against dangerous residual currents that can cause electric shocks or fires. The Siemens 5SV36448 is a selective, type A RCCB for three-phase and neutral circuits, rated at 40 A with a 300 mA residual operating current. It is designed for use in distribution boards where continuity of supply is critical, as its selective characteristic ensures only the faulty circuit is disconnected while downstream devices remain energised.

Who is it for

This device is intended for electricians and panel builders installing or upgrading low-voltage distribution systems in residential, commercial, and industrial buildings. It is suitable for circuits with AC and pulsating DC residual currents, such as those with electronic ballasts or certain power supplies.

Main features

• Selective RCCB type A: detects AC and pulsating DC residual currents.
• Rated current 40 A, rated residual operating current 300 mA.
• 4-pole (3-phase + neutral) for 400 V AC networks, 50/60 Hz.
• Compact design: 4 modular units (TE) wide, DIN rail mounting.
• High short-circuit withstand: 10 kA with 63 A gL/gG fuse.
• Surge current withstand capacity: 3 kA.
• Operating temperature range: -25 °C to +45 °C.
• Meets IEC 61008-1 standard.

Specifications

• Device type: Residual current circuit breaker (RCCB)
• Series: SENTRON
• Type of residual current: A
• Number of poles: 4
• Rated current (In): 40 A
• Rated residual operating current (IΔn): 300 mA
• Rated voltage (Ue): 400 V AC
• Operating frequency: 50/60 Hz
• Selectivity: Selective
• Rated conditional short-circuit current (Inc): 10 kA (with 63 A gL/gG fuse)
• Rated surge current withstand capacity: 3 kA
• Mounting type: DIN rail (TH35)
• Number of modular units (TE): 4
• Installation depth: 70 mm
• Degree of protection: IP20
• Operating temperature range: -25 °C to +45 °C
• Electrical service life: 10,000 switching cycles
• Mechanical service life: 20,000 switching cycles
• Standards: IEC 61008-1

Tips

When installing selective RCCBs, ensure proper discrimination with downstream residual current devices. The 300 mA rating is typically used for fire protection or as a main switch. Always verify local regulations and use appropriate upstream overcurrent protection.