2CCG000481R0001 ABB S403P-K16NP 16 A 3P+NP K Miniature Circuit Breaker 40 kA

Why Choose the ABB S403P-K16NP Miniature Circuit Breaker?

The ABB S403P-K16NP is a high-performance three-pole plus protected neutral miniature circuit breaker (MCB) designed for reliable overload and short-circuit protection in demanding industrial and commercial electrical installations. As part of the ABB S400P range for the SMISSLINE TP plug-in system, it combines a 16 A rated current, K tripping characteristic and high breaking capacity with ABB's flexible plug-in distribution architecture.

Designed in accordance with IEC/EN 60947-2, the S403P-K16NP provides thermal-magnetic protection against sustained overloads and short-circuit faults. Its K characteristic is particularly suitable for appropriate circuits containing equipment with increased starting or inrush currents, helping provide dependable protection while accommodating normal transient current demands.

With a 3P+NP configuration, rated current of 16 A and rated ultimate short-circuit breaking capacity of 40 kA, the S403P-K16NP provides robust protection for three-phase and neutral circuits in installations with demanding fault levels. Its four-module plug-in format enables efficient integration into compatible ABB SMISSLINE TP electrical distribution systems.

Key Advantages

• High-performance 3P+NP miniature circuit breaker for demanding electrical protection applications.
• 16 A rated current for three-phase and neutral circuits.
• 40 kA ultimate short-circuit breaking capacity for high fault-level installations.
• K tripping characteristic suitable for appropriate loads with increased starting or inrush currents.
• Includes a protected neutral pole alongside the three phase poles.
• Thermal-magnetic operation provides reliable overload and short-circuit protection.
• Designed specifically for the ABB SMISSLINE TP plug-in system.

Key Features

• ABB S400P miniature circuit breaker series.
• 3P+NP configuration with protected neutral.
• 16 A rated current.
• K characteristic overcurrent protection.
• 40 kA rated ultimate short-circuit breaking capacity.
• Designed according to IEC/EN 60947-2.
• 50–60 Hz operating frequency.
• Energy limiting class 3.
• Compatible with the SMISSLINE TP plug-in distribution system.
• Four-module format for compatible distribution assemblies.
• Connection terminals accommodate solid conductors up to 35 mm².

Reliable Circuit Protection for SMISSLINE TP Systems

Miniature circuit breakers such as the ABB S403P-K16NP automatically interrupt excessive current before overloads or short circuits can cause unacceptable damage to conductors and connected equipment. The thermal release responds to sustained overload conditions, while the magnetic release provides rapid interruption during short-circuit faults.

The ABB S400P range combines this protective functionality with the SMISSLINE TP plug-in architecture. Direct integration with the compatible plug-in system supports efficient assembly and maintenance, making the S403P-K16NP suitable for professional switchboards, machinery panels and other three-phase distribution applications requiring neutral protection.

Typical Applications

• Three-phase and neutral industrial distribution circuits.
• Machinery and automation control panels.
• Industrial control and auxiliary circuits.
• Circuits requiring a K tripping characteristic.
• Commercial and industrial switchboards.
• Equipment with increased starting or inrush currents.
• ABB SMISSLINE TP plug-in distribution assemblies.