EATON FAZ-B4/1 Miniature Circuit Breaker 4A 1-Pole B-Characteristic 10kA

The EATON FAZ-B4/1 miniature circuit breaker (MCB) provides reliable overcurrent protection with a 4 A rated current and B tripping characteristic, making it an excellent choice for residential and commercial electrical installations. Its 10 kA breaking capacity ensures safe interruption of short-circuit currents, while the 1-pole design and compact 1-module width allow efficient use of DIN rail space.

Advantages

This MCB offers precise protection for circuits with moderate inrush currents, such as lighting and socket outlets. The B characteristic provides fast tripping on short circuits, while the thermal element handles overloads. With screw terminals accepting conductors up to 25 mm², installation is straightforward and secure. The device meets IEC/EN 60898-1, ensuring compliance with international safety standards.

Suitable for

• Residential distribution boards
• Commercial lighting circuits
• Socket outlet protection
• Control circuit protection

Key specifications

• Number of poles: 1
• Rated current: 4 A
• Tripping characteristic: B
• Rated switching capacity: 10 kA
• Rated voltage: 230/400 V AC
• Frequency: 50/60 Hz
• Mounting: DIN rail (EN 60715)
• Module width: 1 module (17.5 mm)
• Degree of protection: IP20 (terminals), IP40 (housing with cover)
• Operating temperature: -25 to +75 °C

Recommendations

For optimal performance, pair this MCB with EATON residual current devices (RCDs) to provide additional protection against earth leakage. Ensure proper torque on screw terminals (2.0–2.4 Nm) and verify compatibility with your distribution board.