2CDS272334R0255 ABB ST202M-B25 Miniature Circuit Breaker 15kA 2P B 25A UL 1077

Why Choose the ABB ST202M-B25 Miniature Circuit Breaker?

The ABB ST202M-B25 is a robust 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 25 A rated current for dependable protection of circuits with relatively low starting and inrush currents.

Designed for applications requiring UL 1077 supplementary protection, the ST202M-B25 provides two-pole protection in a compact DIN rail format. Its B tripping characteristic is particularly suited to control circuits, auxiliary supplies, resistive loads and other electrical equipment where high transient starting currents are not normally expected.

With a rated current of 25 A, a two-pole configuration and an ultimate short-circuit breaking capacity of 15 kA at 400 V AC and 125 V DC according to IEC 60947-2, the ST202M-B25 provides robust supplementary protection for demanding installations. It also provides a 10 kA interrupting rating according to UL 1077 at 240 V AC, 480Y/277 V AC and 125 V DC.

Key Advantages

• Compact two-pole miniature circuit breaker for supplementary circuit protection.
• 25 A rated current suitable for industrial control, auxiliary and general electrical circuits.
• B tripping characteristic suited to circuits with relatively low starting and inrush currents.
• 15 kA ultimate short-circuit breaking capacity at 400 V AC and 125 V DC according to IEC 60947-2.
• 10 kA UL 1077 interrupting rating at specified AC and DC voltages.
• Compact DIN rail construction enables straightforward integration into industrial electrical panels and OEM equipment.

Key Features

• ABB System pro M compact ST200M series.
• 25 A rated current.
• 2-pole configuration.
• B tripping characteristic.
• 15 kA ultimate short-circuit breaking capacity at 400 V AC and 125 V DC.
• 400 V AC rated operational voltage according to IEC 60947-2.
• 440 V rated insulation voltage.
• 4 kV rated impulse withstand voltage.
• 10 kA interrupting rating according to UL 1077 at specified voltages.
• Designed in accordance with UL 1077, CSA 22.2 No. 235 and IEC/EN 60947-2.
• Thermal-magnetic overload and short-circuit protection.
• Compact two-pole DIN rail format for industrial control and electrical equipment.

Reliable Supplementary Protection for Low-Inrush Electrical Circuits

Miniature circuit breakers such as the ABB ST202M-B25 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 B characteristic provides a relatively sensitive magnetic response and is well suited to circuits where large start-up currents are not expected. Combined with its 25 A rating, two-pole configuration and high IEC short-circuit breaking capacity, the ST202M-B25 provides a compact supplementary protection solution for automation panels, resistive loads, control equipment and OEM electrical systems.

Typical Applications

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