2CDS273334R0061 ABB ST203M-D6 Miniature Circuit Breaker 6 A 3P D 15 kA UL1077

Why Choose the ABB ST203M-D6 Miniature Circuit Breaker?

The ABB ST203M-D6 is a compact 3-pole miniature circuit breaker (MCB) designed for supplementary overcurrent and short-circuit protection in industrial machinery, control panels and electrical equipment. As part of the ABB ST200M series, it combines a 6 A rated current with D-characteristic tripping and compliance with the UL 1077 standard.

The ST203M-D6 uses thermal-magnetic protection to respond to sustained overloads and short-circuit faults. Its D tripping characteristic is suited to circuits with relatively high starting or inrush currents, helping avoid unwanted magnetic tripping when equipment such as transformers, motors or other inductive loads is energised.

With a 3-pole configuration, 6 A rated current and 15 kA short-circuit rating, the ST203M-D6 provides dependable supplementary protection for three-pole industrial circuits. ABB order code 2CDS273334R0061 identifies this specific ST200M configuration.

Key Advantages

• Reliable 3-pole supplementary circuit protection for industrial equipment.
• 6 A rated current for control, machinery and equipment circuits.
• D tripping characteristic accommodates loads with high starting or inrush currents.
• 15 kA short-circuit rating for robust fault protection.
• UL 1077 compliant for supplementary overcurrent protection.
• Compact modular construction for integration into industrial control panels.

Key Features

• ABB ST200M miniature circuit breaker series.
• 3-pole configuration.
• 6 A rated current.
• D-characteristic thermal-magnetic tripping.
• 15 kA short-circuit rating.
• Designed for supplementary overcurrent and short-circuit protection.
• Suitable for circuits with high starting or inrush currents within its specified ratings.
• Compact modular design for industrial electrical assemblies.

Reliable Supplementary Protection for High-Inrush Loads

Miniature circuit breakers such as the ABB ST203M-D6 protect conductors and connected equipment by automatically interrupting current during overload or short-circuit conditions. Thermal protection responds to sustained overloads, while the magnetic trip mechanism provides rapid operation when significant fault currents occur.

The D tripping characteristic allows higher short-duration inrush currents before magnetic operation, making it useful for industrial equipment where normal energisation can produce substantial current peaks. Combined with its UL 1077 supplementary protection classification, the ST203M-D6 is well suited to machinery and control circuits requiring supplementary protection for higher-inrush loads.

Typical Applications

• Industrial machinery and machine control panels.
• Transformer and inductive-load circuits.
• Motor-related control equipment.
• Automation and production machinery.
• Electrical equipment requiring supplementary protection.
• OEM control assemblies using UL 1077 supplementary protectors.