2CDS272334R0071 ABB ST202M-D7 Miniature Circuit Breaker 15kA 2P D 7A UL 1077

Why Choose the ABB ST202M-D7 Miniature Circuit Breaker?

The ABB ST202M-D7 is a high-performance 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 D tripping characteristic with a 7 A rated current for dependable protection of circuits supplying equipment with high starting and inrush currents.

Designed for applications requiring UL 1077 supplementary protection, the ST202M-D7 provides two-pole circuit protection in a compact DIN rail format. Its D tripping characteristic makes it particularly suitable for circuits supplying transformers, inductive equipment and other electrical loads that can produce substantial transient currents during start-up.

With a rated current of 7 A, a two-pole configuration and an ultimate short-circuit breaking capacity of 15 kA at 400 V AC and 125 V DC, the ST202M-D7 provides robust supplementary protection for industrial control and distribution applications. Its rated operational voltage is 400 V AC according to IEC 60947-2, while compliance with UL 1077 supports use as a supplementary protector in electrical equipment.

Key Advantages

• Compact two-pole miniature circuit breaker for supplementary circuit protection.
• 7 A rated current suitable for industrial control and auxiliary circuits.
• D tripping characteristic suitable for loads with high starting and inrush currents.
• 15 kA ultimate short-circuit breaking capacity at 400 V AC and 125 V DC.
• 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.
• 7 A rated current.
• 2-pole configuration.
• D tripping characteristic.
• 15 kA ultimate short-circuit breaking capacity at 400 V AC and 125 V DC.
• 11.2 kA service short-circuit breaking capacity at 400 V AC.
• 400 V AC rated operational voltage according to IEC 60947-2.
• 440 V rated insulation voltage.
• 4 kV rated impulse withstand voltage.
• Designed in accordance with UL 1077, CSA 22.2 No. 235 and IEC/EN 60947-2.
• Compact two-module DIN rail format for industrial control and distribution panels.

Reliable Supplementary Protection for High-Inrush Loads

Miniature circuit breakers such as the ABB ST202M-D7 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 demanding industrial applications where compact supplementary protection and recognised international standards are required. The D characteristic accommodates high transient starting currents without unnecessary operation, making the ST202M-D7 particularly suitable for transformers, inductive equipment and other loads with substantial start-up current.

Typical Applications

• Industrial machinery and electrical control panels.
• Automation and process-control equipment.
• Transformer and highly inductive load circuits.
• Control circuits with high equipment start-up currents.
• Commercial and industrial electrical equipment.
• OEM machinery requiring UL 1077 supplementary protection.