2CDS272334R0501 ABB ST202M-D50 50 A 2-Pole Type D Miniature Circuit Breaker

Why Choose the ABB ST202M-D50 Miniature Circuit Breaker?

The ABB ST202M-D50 is a high-performance 2-pole miniature circuit breaker (MCB) designed to provide reliable supplementary overcurrent and short-circuit protection for industrial control equipment and electrical circuits. As part of the robust ABB ST200M series, it combines a 50 A rated current with a Type D tripping characteristic for dependable protection of circuits with high starting and inrush currents.

Designed for supplementary protection in accordance with UL 1077, the ST202M-D50 uses thermal-magnetic operation to disconnect protected circuits during overload and short-circuit conditions. Its compact modular construction makes it well suited to industrial control panels, machinery and OEM electrical assemblies where dependable circuit protection and efficient use of panel space are important.

With two protected poles, a rated current of 50 A and a Type D characteristic, this breaker is particularly suitable for equipment with substantial starting currents, including transformers, motors and other inductive loads. ABB order code 2CDS272334R0501 provides precise product identification for specification, procurement and replacement.

Key Advantages

• Reliable 2-pole supplementary circuit protection for industrial electrical equipment.
• 50 A rated current for machinery and equipment circuits.
• Type D tripping characteristic suited to loads with high starting and inrush currents.
• Designed for supplementary protection in accordance with UL 1077.
• Thermal-magnetic protection against overload and short-circuit conditions.
• Compact modular construction simplifies DIN-rail installation in control panels.

Key Features

• ABB ST200M miniature circuit breaker series.
• 2-pole configuration.
• 50 A rated current.
• Type D tripping characteristic.
• 15 kA short-circuit breaking capacity.
• Thermal-magnetic overcurrent protection.
• UL 1077 supplementary protector classification.
• Compact modular format for DIN-rail mounting.

Reliable Supplementary Circuit Protection

Miniature circuit breakers such as the ABB ST202M-D50 automatically disconnect protected circuits when excessive current results from an overload or short circuit. Unlike a fuse, the breaker can be reset after the electrical fault has been identified and corrected, helping simplify maintenance and reduce replacement requirements in industrial equipment.

The Type D operating characteristic provides increased tolerance of high instantaneous starting currents, making it particularly suitable for transformers, motors and other inductive equipment. Combined with the ST200M series' compact modular construction and high breaking capacity, this makes the ST202M-D50 a practical supplementary protection device for demanding industrial installations.

Typical Applications

• Industrial control panels and automation equipment.
• Motor and machinery circuits with high starting currents.
• Transformer and inductive load circuits.
• Industrial machinery and OEM equipment.
• Power supply and equipment protection circuits.
• Supplementary circuit protection where UL 1077 devices are specified.