2CCG000493R0001 ABB S401P-B40NP 40 A 1P+NP B Miniature Circuit Breaker 30 kA

Why Choose the ABB S401P-B40NP Miniature Circuit Breaker?

The ABB S401P-B40NP is a high-performance single-pole plus protected neutral miniature circuit breaker (MCB) designed for reliable overload and short-circuit protection in industrial, commercial and critical-power electrical distribution systems. As part of the ABB S400P range for the SMISSLINE TP plug-in system, it combines a 40 A rated current, B tripping characteristic and high breaking capacity with ABB's modular plug-in distribution architecture.

Designed according to IEC/EN 60947-2, the S401P-B40NP provides current-limiting protection against overload and short-circuit conditions. Its B characteristic is suited to appropriate circuits with comparatively low starting or inrush currents, making it suitable for general distribution and appropriate resistive-load applications.

With a 1P+NP configuration, rated current of 40 A and rated ultimate short-circuit breaking capacity of 30 kA, the S401P-B40NP provides robust phase and neutral protection. Its compact two-module construction is designed for efficient integration into compatible ABB SMISSLINE TP electrical distribution assemblies.

Key Advantages

• Compact 1P+NP miniature circuit breaker for phase and neutral circuit protection.
• 40 A rated current for industrial and commercial electrical distribution.
• 30 kA ultimate short-circuit breaking capacity for demanding fault-level applications.
• B tripping characteristic suitable for appropriate circuits with comparatively low inrush currents.
• Two protected poles, providing overcurrent protection for phase and neutral.
• High 440 V rated insulation voltage and 4 kV impulse withstand voltage.
• Compact two-module construction.
• Designed specifically for the ABB SMISSLINE TP plug-in system.

Key Features

• ABB S400P miniature circuit breaker series.
• 1P+NP configuration with two protected poles.
• 40 A rated current.
• B characteristic overcurrent protection.
• 30 kA rated ultimate short-circuit breaking capacity.
• Designed according to IEC/EN 60947-2.
• 240 V AC rated voltage.
• 440 V rated insulation voltage.
• 4 kV rated impulse withstand voltage.
• 50–60 Hz operating frequency.
• Energy limiting class 3.
• IP20 degree of protection.
• Compatible with the SMISSLINE TP plug-in distribution system.

Reliable Circuit Protection for SMISSLINE TP Systems

The ABB S401P-B40NP provides automatic overcurrent protection for phase and neutral conductors, helping protect electrical wiring and connected equipment against sustained overloads and damaging short-circuit currents. Its current-limiting performance reduces the electrical energy passed during a fault, while the B characteristic is suited to appropriate circuits where comparatively low inrush currents are expected.

The S400P range combines this high-performance protective functionality with ABB's SMISSLINE TP plug-in architecture. The S401P-B40NP's compact two-module construction and protected neutral configuration make it a practical solution for professional single-phase distribution systems requiring efficient installation and dependable phase and neutral protection.

Typical Applications

• Single-phase industrial and commercial distribution circuits.
• Building electrical distribution systems.
• Appropriate resistive-load circuits.
• Circuits with comparatively low starting and inrush currents.
• Machinery and automation control panels.
• Commercial and industrial switchboards.
• Critical-power distribution assemblies.
• ABB SMISSLINE TP plug-in distribution systems.