2CDS272334R0318 ABB ST202M-Z3 Miniature Circuit Breaker 15kA 2P Z 3A UL 1077

Why Choose the ABB ST202M-Z3 Miniature Circuit Breaker?

The ABB ST202M-Z3 is a sensitive two-pole miniature circuit breaker (MCB) designed to provide supplementary overcurrent and short-circuit protection for industrial control, automation and electronic circuits. As part of the ABB System pro M compact ST200M series, it combines a Z tripping characteristic with a 3 A rated current for applications requiring a rapid magnetic response to comparatively low overcurrents.

Designed for UL 1077 supplementary protection applications, the ST202M-Z3 provides two-pole protection in a compact DIN rail format. Its Z tripping characteristic is particularly suited to sensitive electrical and electronic equipment, control systems and instrumentation where close protection against overcurrent is required.

With a rated current of 3 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-Z3 combines sensitive circuit protection with robust fault-clearing capability. The ST200M range also provides supplementary protection according to UL 1077 with interrupting ratings up to 10 kA at 480Y/277 V AC and 125 V DC.

Key Advantages

• Compact two-pole miniature circuit breaker for supplementary circuit protection.
• 3 A rated current suitable for control, instrumentation and electronic circuits.
• Z tripping characteristic provides sensitive response to comparatively low overcurrents.
• 15 kA ultimate short-circuit breaking capacity at 400 V AC and 125 V DC according to IEC 60947-2.
• Designed for UL 1077 supplementary protection applications.
• Compact DIN rail construction enables straightforward integration into industrial control panels and OEM equipment.

Key Features

• ABB System pro M compact ST200M series.
• 3 A rated current.
• 2-pole configuration.
• Z 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.
• Supplementary protection according to UL 1077.
• Designed in accordance with UL 1077, CSA 22.2 No. 235 and IEC/EN 60947-2.
• Compact DIN rail format for integration with modular electrical equipment.

Sensitive Supplementary Protection for Control and Electronic Circuits

Miniature circuit breakers such as the ABB ST202M-Z3 automatically interrupt a circuit when excessive current caused by an overload or short circuit is detected. The Z characteristic provides a comparatively sensitive magnetic response, making it appropriate for circuits where rapid interruption of relatively low fault currents is desirable.

This characteristic makes the ST202M-Z3 particularly useful for industrial control electronics, instrumentation and other sensitive electrical loads. Combined with its 3 A rating, two-pole configuration and high IEC short-circuit breaking capacity, it provides a compact supplementary protection solution for automation panels, machinery and OEM electrical equipment.

Typical Applications

• Industrial automation and control panels.
• Electronic control and monitoring equipment.
• Instrumentation and measurement circuits.
• Low-current auxiliary and control circuits.
• Sensitive electronic and semiconductor-based equipment.
• OEM machinery requiring UL 1077 supplementary protection.