ABB MS116-0.4 Motor Protection Circuit Breaker, 0.4A, 3-Pole, Thermal-Magnetic

In industrial control panels and motor control centers, protecting motors from overloads and short circuits is critical. The ABB MS116-0.4 motor protection circuit breaker ensures reliable protection for motors with a rated current of 0.4 A. This 3-pole device combines thermal and magnetic trip functions in a compact DIN rail mountable unit, making it ideal for machine builders and panel builders who need dependable protection without taking up excessive space.

Key specifications

• Rated operational current: 0.4 A
• Thermal overload setting range: 0.25 - 0.4 A
• Magnetic trip setting (instantaneous short-circuit release): 6 A
• Number of poles: 3
• Rated operational voltage: 690 V AC
• Rated insulation voltage: 690 V
• Rated impulse withstand voltage: 6 kV
• Rated short-circuit breaking capacity (Icu) at 400V: 100 kA
• Degree of protection: IP20 (terminals), IP00 (housing)
• Mounting: DIN rail (35 mm)
• Connection: screw terminals
• Operating temperature range: -25 to +70 °C
• Standards: IEC/EN 60947-1, IEC/EN 60947-2, IEC/EN 60947-4-1, UL 60947-4-1, CSA C22.2 No. 60947-4-1
• Tripping characteristic: thermal-magnetic
• Electrical durability: 100,000 cycles
• Mechanical durability: 100,000 cycles
• Power loss per pole: 0.8 W
• Terminal capacity: flexible 1-6 mm², rigid 1-10 mm²

Why choose it

The MS116 series is known for its high breaking capacity and precise protection. With a 100 kA short-circuit rating at 400V, it can handle severe fault conditions, reducing the risk of damage to downstream equipment. The adjustable thermal overload allows fine-tuning to the exact motor current, preventing nuisance trips while ensuring protection. Its compact size saves panel space, and the screw terminals provide secure connections for both flexible and rigid conductors.

Ideal use cases

• Protection of small motors in industrial machinery
• Motor control centers and distribution boards
• HVAC systems with fractional horsepower motors
• Pumps, fans, and conveyor drives
• Any application requiring reliable motor protection up to 0.4 A

Good to know

The MS116-0.4 is compliant with international standards, ensuring global acceptance. It is designed for DIN rail mounting, simplifying installation and replacement. The thermal-magnetic trip mechanism provides both overload and short-circuit protection without the need for separate fuses. With a wide operating temperature range, it performs reliably in harsh environments. Always verify that the motor's full-load current falls within the adjustable range for optimal protection.