ABB SX203-B40 3-Pole Miniature Circuit Breaker, Type B, 40 A, 400 V AC, 6 kA

Electrical circuits need reliable protection against overloads and short circuits. The ABB SX203-B40 is a 3-pole miniature circuit breaker (MCB) that automatically interrupts the current when it exceeds safe levels, preventing damage to wiring and connected equipment. With a rated current of 40 A and a type B tripping characteristic, it responds quickly to short-circuit currents while tolerating normal inrush currents from lighting and socket circuits.

Who is it for

This MCB is intended for electricians, panel builders, and maintenance technicians working in residential, commercial, and light industrial installations. It is suitable for protecting three-phase circuits such as motors, heaters, and distribution boards where a 40 A rated current and 6 kA breaking capacity are required.

Main features

• 3-pole design for three-phase circuits
• Type B tripping characteristic (3-5 times rated current)
• Rated current: 40 A
• Rated voltage: 400 V AC
• Breaking capacity: 6 kA (6000 A)
• DIN rail mounting
• Width: 52.8 mm (3 modules of 17.6 mm each)

Specifications

• Brand: ABB
• Model: SX203-B40
• MPN: 2CDS253003R0405
• EAN: 4053546052787
• Circuit breaker type: Miniature circuit breaker (MCB)
• Number of poles: 3
• Tripping characteristic: Type B
• Rated current (In): 40 A
• Rated voltage (Ue): 400 V AC
• Rated frequency: 50/60 Hz
• Rated short-circuit breaking capacity (Icn): 6 kA
• Mounting type: DIN rail
• Width: 52.8 mm
• Depth: 69 mm
• Height: 85 mm
• Quantity per pack: 1

Tips

Before installation, ensure the circuit's maximum demand does not exceed 40 A and that the short-circuit current at the point of installation is within the 6 kA breaking capacity. Use appropriate screw terminals and torque settings as per ABB installation instructions.