ABB MS116-20 Motor Protection Circuit Breaker, 16-20 A, 3-Pole, 690 V AC, 50 kA, Screw Terminals

The ABB MS116-20 motor protection circuit breaker delivers reliable thermal-magnetic protection for motors up to 20 A, ensuring safe operation and preventing damage from overloads and short circuits. Its compact design and DIN rail mounting make it ideal for industrial control panels and motor starters.

Advantages

With a rated short-circuit breaking capacity of 50 kA at 400 V AC, the MS116-20 provides robust protection in demanding environments. The adjustable thermal overload setting range of 16-20 A allows precise matching to motor full-load current, while the fixed magnetic release at 240 A ensures fast response to short circuits. Screw terminals accommodate conductors up to 10 mm² rigid, simplifying installation and maintenance.

Suitable for

• Three-phase motors up to 20 A in industrial applications
• Motor control centers and distribution boards
• Machinery requiring reliable motor protection per IEC/EN 60947 standards
• DIN rail mounted assemblies in harsh environments (-25 to +70 °C)

Key specifications

• Rated operational current: 20 A
• Thermal overload setting range: 16 - 20 A
• Rated operational voltage: 690 V AC
• Number of poles: 3
• Tripping characteristic: Thermal-magnetic
• Rated short-circuit breaking capacity at 400 V AC: 50 kA
• Degree of protection: IP20 (terminals)
• Mounting type: DIN rail
• Connection type: Screw terminals
• Terminal capacity: 1-10 mm² rigid, 1-6 mm² flexible
• Ambient operating temperature: -25 to +70 °C
• Magnetic release setting: 240 A
• Standard compliance: IEC/EN 60947-1, -2, -4-1
• Electrical and mechanical life: 100,000 cycles each
• Power loss per pole: 1.5 W

Recommendations

For optimal performance, verify that the motor's full-load current falls within the adjustable range and that the supply voltage does not exceed 690 V AC. Use appropriate screwdrivers and torque settings when terminating conductors to ensure reliable connections.