ABB MS132-0.4 Motor Protection Circuit Breaker, 0.25-0.4 A, 3-Pole, 690 V AC, 100 kA, Thermal-Magnetic, DIN Rail

The ABB MS132-0.4 stands apart from generic motor starters by combining a precise 0.25–0.4 A adjustment range with a 100 kA breaking capacity, making it a robust choice for protecting small motors and control circuits in industrial environments. Its thermal-magnetic trip unit ensures reliable overload and short-circuit protection without the need for separate fuses, while the compact 45 mm width saves valuable panel space.

Highlights

• Adjustable thermal overload protection from 0.25 to 0.4 A for fine-tuned motor safeguarding.
• Fixed magnetic trip at 6 A for immediate short-circuit response.
• High breaking capacity of 100 kA at 400 V AC, suitable for demanding installations.
• 3-pole design with screw terminals for secure wiring up to 10 mm² rigid or 6 mm² flexible.
• DIN rail mounting and IP20 protection for straightforward integration into control cabinets.

In daily use

Installed on a standard 35 mm DIN rail, the MS132-0.4 provides dependable protection for small motors, pumps, fans, and other low-current loads. The rotary adjustment knob allows precise setting of the rated current within its range, while the clear trip indication simplifies troubleshooting. Its thermal-magnetic mechanism reacts quickly to overloads and short circuits, reducing downtime and preventing equipment damage. The device is suitable for ambient temperatures from -25 °C to +70 °C, and its screw terminals accept both rigid and flexible conductors, ensuring a reliable connection in vibration-prone environments.

Full specifications

• Rated operational current setting range: 0.25 - 0.4 A
• Rated operational voltage: 690 V AC
• Number of poles: 3
• Rated ultimate short-circuit breaking capacity (Icu) at 400V AC: 100 kA
• Magnetic trip setting: 6 A (fixed)
• Rated frequency: 50/60 Hz
• Mounting type: DIN rail
• Degree of protection: IP20
• Rated impulse withstand voltage (Uimp): 6 kV
• Terminal type: Screw terminals
• Ambient operating temperature: -25 to +70 °C
• Tripping characteristic: Thermal-magnetic
• Function: Motor protection, manual motor starter
• Standard compliance: IEC/EN 60947-1, -2, -4-1
• Power loss per pole: 1.5 W (at Ie)
• Electrical durability: 100000 cycles
• Mechanical durability: 100000 cycles
• Connection capacity main circuit: Flexible 1-6 mm², rigid 1-10 mm²

Final note

With its compact footprint and high breaking capacity, the ABB MS132-0.4 is a reliable choice for protecting low-current motors in industrial control panels.