2CCG000514R0001 ABB S403P-B4 4 A 3P B Miniature Circuit Breaker 40 kA

Why Choose the ABB S403P-B4 Miniature Circuit Breaker?

The ABB S403P-B4 is a high-performance three-pole miniature circuit breaker (MCB) designed to protect electrical circuits against overload and short-circuit currents. As part of the ABB S400P range for the SMISSLINE TP plug-in system, it combines a 4 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 S403P-B4 is a current-limiting circuit breaker incorporating delayed thermal tripping for overload protection and electromechanical tripping for short-circuit protection. Its B characteristic is suitable for appropriate resistive and inductive loads with relatively low starting currents.

With a 3P configuration, rated current of 4 A and rated ultimate short-circuit breaking capacity of 40 kA, the S403P-B4 provides robust three-pole protection. Its compact three-module construction enables efficient integration into compatible ABB SMISSLINE TP electrical distribution assemblies.

Key Advantages

• High-performance three-pole miniature circuit breaker for dependable overcurrent protection.
• 4 A rated current for appropriate low-current circuits.
• 40 kA ultimate short-circuit breaking capacity for demanding fault-level applications.
• B tripping characteristic suited to appropriate loads with relatively low starting currents.
• Three protected poles provide simultaneous overcurrent protection across all three poles.
• Delayed thermal release provides protection against sustained overload conditions.
• Electromechanical release provides rapid protection against short-circuit currents.
• Designed specifically for the ABB SMISSLINE TP plug-in system.

Key Features

• ABB S400P miniature circuit breaker series.
• 3P configuration with three protected poles.
• 4 A rated current.
• B characteristic overcurrent protection.
• 40 kA rated ultimate short-circuit breaking capacity.
• Designed according to IEC/EN 60947-2.
• Current-limiting circuit-breaker design.
• Thermal overload and electromechanical short-circuit tripping mechanisms.
• Suitable for the S400P system's 240/415 V AC application range.
• Compact three-module construction.
• Compatible with the SMISSLINE TP plug-in distribution system.

Reliable Circuit Protection for SMISSLINE TP Systems

The ABB S403P-B4 uses two complementary tripping mechanisms to protect electrical circuits. Its delayed thermal release responds to sustained overload conditions, while the electromechanical release provides rapid operation during short-circuit faults, helping safeguard conductors and connected electrical equipment against damaging overcurrents.

The S400P range combines current-limiting circuit protection with ABB's SMISSLINE TP plug-in architecture. The S403P-B4's three protected poles, compact three-module construction and 4 A rating make it particularly suitable for low-current three-pole circuits requiring dependable protection and efficient integration into a modular distribution system.

Typical Applications

• Low-current three-phase industrial and commercial distribution circuits.
• Control and auxiliary power circuits.
• Automation and machinery control panels.
• Appropriate resistive loads with relatively low starting currents.
• Appropriate inductive loads with low starting currents.
• Instrumentation and control-system supply circuits.
• Commercial and industrial switchboards.
• ABB SMISSLINE TP plug-in distribution assemblies.