This device is a modular protection assembly by Siemens consisting of a residual current unit (RC Unit) combined with a miniature circuit breaker (MCB), designed to provide complete protection of electrical circuits against overloads, short circuits, and earth leakage currents.

The configuration includes:

• Siemens 5SM2 322-0 – Residual current unit (RC Unit)

• Siemens 5SY42 C16 – Miniature circuit breaker

When assembled, the system functions similarly to a Residual Current Circuit Breaker with Overcurrent Protection (RCBO).

The 30 mA residual current protection ensures personal safety by detecting leakage currents and protecting against indirect contact, while the 16 A C-curve circuit breaker protects the circuit from overloads and short circuits.

This modular protection solution is suitable for installation in residential, commercial, and industrial electrical panels.

⚙️ Technical Specifications

🔹 Residual Current Unit

Brand: Siemens
Model: 5SM2 322-0
Type: RC Unit (Residual current module)
Rated residual current (IΔn): 30 mA (0.03 A)
Protection type: Earth leakage protection
Test button: Present

🔹 Miniature Circuit Breaker

Brand: Siemens
Model: 5SY42
Rated current: 16 A
Tripping curve: C
Number of poles: 2P

🔌 Electrical Data

• Rated voltage: 400 V AC

• Breaking capacity: 10 kA

• Frequency: 50 / 60 Hz

🛠 Installation

• Mounting on 35 mm DIN rail

• Modular structure compatible with Siemens distribution boards

• Direct coupling between RC unit and circuit breaker

🏭 Applications

Suitable for:

✔ Residential electrical panels
✔ Protection of household circuits
✔ Industrial electrical installations
✔ Socket outlet circuits
✔ Power distribution systems