2CDS271334R0488 ABB ST201M-Z20 Miniature Circuit Breaker 20 A 1P Type Z

Why Choose the ABB ST201M-Z20 Miniature Circuit Breaker?

The ABB ST201M-Z20 is a compact and reliable single-pole miniature circuit breaker (MCB) designed to provide supplementary overcurrent and short-circuit protection in industrial electrical and control applications. As part of the ABB ST200M miniature circuit breaker series, it combines a 20 A rated current with a Z tripping characteristic and UL 1077 supplementary protection capability.

Designed for installation on DIN rail systems, the ST201M-Z20 provides dependable circuit protection in a compact modular format. Its thermal-magnetic operating principle protects against sustained overload currents and short-circuit conditions, while the sensitive Z characteristic is particularly suitable for electronic equipment, semiconductor devices and control circuits requiring rapid magnetic tripping at comparatively low overcurrents.

With a rated current of 20 A, Z tripping characteristic, 15 kA short-circuit breaking capacity and a single-pole configuration, the ST201M-Z20 is suitable for supplementary protection in automation equipment, control panels and sensitive industrial electrical systems. ABB order code 2CDS271334R0488 identifies this specific ST200M configuration.

Key Advantages

• Compact single-pole miniature circuit breaker for supplementary circuit protection.
• 20 A rated current for industrial control and electronic applications.
• Z tripping characteristic for sensitive circuits requiring rapid response to overcurrent.
• 15 kA short-circuit breaking capacity for robust fault protection.
• Thermal-magnetic operation provides overload and short-circuit protection.
• UL 1077 supplementary protector design for equipment and control circuits.
• DIN rail mounting enables straightforward integration into electrical panels.

Key Features

• ABB ST200M miniature circuit breaker series.
• 20 A rated current.
• 1-pole configuration.
• Type Z tripping characteristic.
• 15 kA short-circuit breaking capacity.
• UL 1077 supplementary protection for electrical equipment and control circuits.
• Thermal-magnetic operating mechanism for overload and short-circuit protection.
• Suitable for sensitive electronic, semiconductor and control loads.
• Compact modular construction for DIN rail installations.

Sensitive Protection for Electronic and Control Circuits

Miniature circuit breakers such as the ABB ST201M-Z20 automatically interrupt a circuit when excessive current occurs due to an overload or short circuit. This helps protect wiring and electrical equipment while allowing the breaker to be reset after the fault has been identified and corrected.

The Z tripping characteristic provides a sensitive magnetic response and is particularly useful for protecting electronic equipment, semiconductor devices and control circuits where relatively small overcurrents can cause damage. Combined with compact DIN rail construction and UL 1077 supplementary protection, the ST201M-Z20 is well suited to modern industrial automation systems.

Typical Applications

• Industrial automation and process control systems.
• Electronic equipment and semiconductor circuits.
• PLC and instrumentation control circuits.
• Industrial power supplies and control equipment.
• Sensitive auxiliary and signal circuits.
• OEM machinery and electrical cabinet assemblies.