2CDS271334R0065 ABB ST201M-B6 MCB 15 kA 1P Type B 6 A UL 1077

Why Choose the ABB ST201M-B6 Miniature Circuit Breaker?

The ABB ST201M-B6 is a single-pole miniature circuit breaker / supplementary protector rated at 6 A with a Type B tripping characteristic. Designed for UL 1077 applications, it provides supplementary overcurrent protection for electrical equipment and internal circuits where dependable overload and short-circuit protection is required.

With a 15 kA short-circuit interrupting rating, the ST201M-B6 combines compact modular construction with thermal-magnetic protection. Its Type B characteristic provides sensitive magnetic operation for circuits with relatively low normal inrush currents, making it well suited to control, instrumentation and auxiliary electrical loads.

As part of ABB's modular circuit protection portfolio, the ST201M-B6 is designed for integration into industrial machinery, automation equipment and OEM electrical assemblies. Its 1-pole, 6 A configuration provides focused supplementary protection while supporting an organised modular panel layout.

Key Advantages

• 6 A rated current for low-current equipment, control and auxiliary circuits.
• Type B tripping characteristic suited to circuits with relatively low inrush current.
• 15 kA short-circuit interrupting rating.
• Thermal-magnetic operation provides overload and short-circuit protection.
• Single-pole configuration supports compact circuit protection arrangements.
• Modular construction simplifies integration into electrical equipment.
• Designed for UL 1077 supplementary protection applications.

Key Features

• ABB ST201M series supplementary protector.
• 1-pole configuration.
• 6 A rated current.
• Type B tripping characteristic.
• 15 kA short-circuit interrupting rating.
• Thermal response to sustained overload conditions.
• Magnetic operation under short-circuit conditions.
• Suitable for appropriate circuits with low normal starting currents.
• Designed for UL 1077 supplementary protection applications.

Reliable Supplementary Overcurrent Protection

The ABB ST201M-B6 uses a thermal-magnetic operating principle to protect against both sustained overload and short-circuit conditions. The thermal element responds when excessive current persists over time, while the magnetic mechanism provides rapid operation when a sufficiently high fault current occurs.

Its Type B characteristic is suited to appropriately designed circuits where high starting currents are not normally expected. As a UL 1077 supplementary protector, the ST201M-B6 is intended to provide additional overcurrent protection within equipment and is not a substitute for required branch-circuit protection.

Typical Applications

• Industrial control circuits.
• Machine and automation control panels.
• Instrumentation circuits.
• Control power distribution.
• Auxiliary electrical circuits.
• OEM machinery and equipment.
• Electrical equipment requiring UL 1077 supplementary protection.