2CDS273334R0258 ABB ST203M-Z1.6 Miniature Circuit Breaker 1.6 A 3P Z 15 kA UL1077

Why Choose the ABB ST203M-Z1.6 Miniature Circuit Breaker?

The ABB ST203M-Z1.6 is a compact 3-pole miniature circuit breaker (MCB) designed for supplementary overcurrent and short-circuit protection in industrial control, instrumentation and electrical equipment. As part of the ABB ST200M series, it combines a 1.6 A rated current with Z-characteristic tripping and compliance with the UL 1077 standard.

The ST203M-Z1.6 uses thermal-magnetic protection to respond to sustained overloads and short-circuit faults. Its Z tripping characteristic provides sensitive magnetic response, making it particularly suitable for sensitive electrical and electronic circuits where rapid response to overcurrent conditions is required.

With a 3-pole configuration, 1.6 A rated current and 15 kA short-circuit rating, the ST203M-Z1.6 provides dependable supplementary protection for low-current three-pole circuits. ABB order code 2CDS273334R0258 identifies this specific ST200M configuration.

Key Advantages

• Reliable 3-pole supplementary circuit protection for sensitive electrical equipment.
• 1.6 A rated current suited to low-current control and instrumentation circuits.
• Z tripping characteristic provides sensitive magnetic response to overcurrent conditions.
• 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.
• 1.6 A rated current.
• Z-characteristic thermal-magnetic tripping.
• 15 kA short-circuit rating.
• Designed for supplementary overcurrent and short-circuit protection.
• Suitable for sensitive electrical, electronic, control and instrumentation circuits.
• Compact modular design for electrical control and automation assemblies.

Sensitive Supplementary Protection for Control and Electronic Circuits

Miniature circuit breakers such as the ABB ST203M-Z1.6 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 Z tripping characteristic provides a sensitive magnetic response suited to circuits containing equipment that requires close overcurrent protection. Combined with its UL 1077 supplementary protection classification, the ST203M-Z1.6 is well suited to industrial control, instrumentation and sensitive electrical or electronic equipment circuits requiring compact and resettable protection.

Typical Applications

• Industrial control and automation circuits.
• Instrumentation and monitoring equipment.
• Sensitive electrical and electronic equipment.
• Low-current control circuits.
• Electrical equipment requiring supplementary protection.
• OEM control assemblies using UL 1077 supplementary protectors.