2CDS272334R0045 ABB ST202M-B4 Miniature Circuit Breaker 15kA 2P B 4A UL 1077

Why Choose the ABB ST202M-B4 Miniature Circuit Breaker?

The ABB ST202M-B4 is a compact and reliable two-pole miniature circuit breaker (MCB) designed to provide supplementary overcurrent and short-circuit protection in industrial, commercial and machine-building electrical systems. As part of the ABB System pro M compact ST200M series, it combines a B tripping characteristic with a 4 A rated current for dependable protection of control, auxiliary and other low-inrush electrical circuits.

Designed for applications requiring UL 1077 supplementary protection, the ST202M-B4 provides two-pole circuit protection in a compact DIN rail format. Its B tripping characteristic is suited to circuits with relatively low starting and inrush currents, including control equipment, auxiliary supplies and resistive loads.

With a rated current of 4 A, a two-pole configuration and a short-circuit breaking capacity of 15 kA, the ST202M-B4 provides robust supplementary protection for industrial control and distribution applications. Its compact modular construction makes it well suited to electrical panels, machinery and OEM equipment where reliable circuit protection and efficient use of panel space are important.

Key Advantages

• Compact two-pole miniature circuit breaker for supplementary circuit protection.
• 4 A rated current suitable for control, auxiliary and low-current electrical circuits.
• B tripping characteristic suited to circuits with relatively low starting and inrush currents.
• 15 kA short-circuit breaking capacity for robust fault protection.
• Designed for UL 1077 supplementary protection applications.
• DIN rail mounting enables straightforward integration into industrial electrical panels and machinery.

Key Features

• ABB System pro M compact ST200M series.
• 4 A rated current.
• 2-pole configuration.
• B tripping characteristic.
• 15 kA short-circuit breaking capacity.
• Designed for UL 1077 supplementary circuit protection.
• Thermal-magnetic overcurrent protection.
• Resettable operation eliminates the need to replace conventional fuses after normal fault clearing.
• Compact modular construction for efficient use of control-panel space.
• DIN rail mounting for straightforward installation.

Reliable Supplementary Protection for Industrial Electrical Systems

Miniature circuit breakers such as the ABB ST202M-B4 automatically interrupt a circuit when excessive current caused by an overload or short circuit is detected. This helps protect conductors and connected electrical equipment while providing convenient resettable protection for industrial control, auxiliary and machine-building circuits.

The ST200M series is designed for industrial and OEM applications where compact supplementary protection is required. The B characteristic provides responsive magnetic tripping for circuits with relatively low inrush currents, making the ST202M-B4 particularly suitable for control equipment, auxiliary circuits and other electrical loads where high start-up currents are not normally expected.

Typical Applications

• Industrial machinery and electrical control panels.
• Automation and process-control equipment.
• Control and auxiliary electrical circuits.
• Resistive and low-inrush electrical loads.
• Commercial and industrial electrical equipment.
• OEM machinery requiring UL 1077 supplementary protection.