Mini circuit breaker ABB SH201-B20A 1P 20A 6kA (MPN 2CDS211001R0205)

ABB SH201-B20A is a single-pole miniature circuit breaker rated at 20 A with a 6 kA breaking capacity, designed for overcurrent protection in residential and light commercial electrical installations. The device fits standard DIN-rail distribution boards and offers thermal-magnetic trip characteristics to protect circuits from short circuits and overloads while maintaining compact dimensions for space-efficient distribution panels.

Advantages

The breaker combines a clear B-type trip curve for protection of resistive and light inductive loads with reliable thermal-magnetic operation that responds to both overloads and short-circuit events. Its compact single-pole design simplifies installation in common distribution boards and helps preserve available DIN-rail space. The unit is manufactured to industry safety and performance standards, ensuring consistent operation and predictable trip behaviour under defined fault conditions.

Suitable for

• Protection of lighting circuits in homes and apartments
• Protection of socket circuits for general domestic and small office loads
• DIN-rail installation in residential and light commercial distribution panels
• Applications requiring a B-characteristic curve for mildly inductive loads

When it may not be suitable

This single-pole 20 A breaker is not designed for three-phase systems or for high short-circuit fault levels beyond its 6 kA breaking capacity. It may be unsuitable where selective coordination with upstream protection requires different time-current characteristics or where higher breaking capacity is mandated by local regulations or utility requirements.

Key specifications

• Poles: 1 (single-pole)
• Rated current: 20 A
• Trip characteristic: B-type (thermal-magnetic)
• Breaking capacity: 6 kA
• Mounting: DIN-rail (standard 35 mm rail compatible)
• Intended use: overcurrent protection (short-circuit and overload)

How to use

Install the miniature circuit breaker onto a standard 35 mm DIN-rail in the distribution board, ensuring the supply and load conductors are connected to the correct terminal markings and tightened to the manufacturer´s recommended torque. Use appropriate conductor sizes and ensure the upstream and downstream protective devices are coordinated according to the installation design. After wiring, switch the breaker on and verify circuit continuity and correct operation by performing standard commissioning checks and tests in line with local electrical codes.

What to consider before purchase

• Confirm that a single-pole 20 A B-type breaker meets the expected load inrush and continuous current demands
• Verify the 6 kA breaking capacity is sufficient for the installation's prospective fault current
• Ensure physical compatibility with the distribution board DIN-rail and available space
• Check local regulations and coordination requirements with upstream protection devices

Usage recommendations

Use this ABB SH201-B20A breaker for individual circuit protection where B-type characteristics are appropriate, such as lighting and general-purpose socket circuits; verify fault level and coordination before selecting for any installation.