This assembly consists of a BTicino F84/4/40 4-pole miniature circuit breaker (MCB) combined with a BTicino G44/63AS residual current block (RCD module), forming a complete magnetothermal and residual current protection solution for three-phase systems with neutral.

The combined unit provides:

• Overload protection

• Short-circuit protection

• Earth leakage (residual current) protection

It is particularly suitable for advanced residential switchboards and industrial distribution panels where reliable four-pole protection is required.

With a rated residual operating current of 300 mA (0.3A), this device is especially appropriate as a main upstream protection device, contributing to fire prevention in the event of insulation faults.

⚙️ Technical Specifications

🔹 Miniature Circuit Breaker (MCB)

Brand: BTicino
Model: F84/4/40
Number of poles: 4P (3P + N)
Rated current (In): 40 A
Tripping curve: C
Rated voltage: 400 V AC
Breaking capacity: 6 kA
Frequency: 50/60 Hz

🔹 Residual Current Block (RCD Module)

Model: G44/63AS
Rated current supported: 63 A
Rated residual operating current (Idn): 0.3 A (300 mA)
Type: AC
Test button: Present
Status indication: Dedicated blue lever

🏭 Applications

✔ Three-phase electrical panels
✔ Industrial installations
✔ Main distribution lines
✔ Feeder protection
✔ Commercial buildings
✔ Upstream protection of sub-distribution boards

The 300 mA residual threshold makes this device particularly suitable for general fire protection against earth leakage currents.

🔒 Protection Functions

✔ Thermal protection against overloads
✔ Magnetic protection against short circuits
✔ Residual current protection against earth faults
✔ Simultaneous disconnection of all 4 poles

🛠 Installation

• DIN rail mounting

• Screw terminal connections

• Compatible with BTicino modular systems

• Direct integration of MCB + residual current block

📦 Condition

Used product in good cosmetic condition.
Electrical functionality not tested at this stage.
Supplied as shown in the images.

✅ Advantages

✔ Compact combined protection system
✔ Complete 4-pole protection
✔ High BTicino build quality
✔ Suitable as a three-phase main breaker
✔ Integrated TEST button for periodic verification