ABB STOTZ-KONTAKT Motor Protection Circuit Breaker MS116-12 (1SAM250000R1012)

Motor protection circuit breaker with thermal-magnetic trip unit, rated at 12 A, delivering reliable protection for motors up to 7.5 kW at 400 V AC. The MS116-12 combines short-circuit and overload protection in a compact 45 mm width, ensuring safe operation and reduced downtime in industrial applications.

Advantages

High breaking capacity of 100 kA at 400 V AC ensures safety even under severe fault conditions. The precise thermal release adjustment from 8 to 12 A allows optimal motor protection without nuisance tripping. Screw terminals and DIN rail mounting enable fast installation and maintenance. The device is maintenance-free with a mechanical and electrical endurance of 100,000 switching cycles.

Suitable for

• Three-phase motors up to 7.5 kW at 400 V AC
• Motor starters in industrial control panels
• Pumps, fans, conveyors, and machine tools
• Applications requiring manual motor disconnection and protection

Key specifications

• Rated operational current: 12 A
• Setting range for thermal overload release: 8 - 12 A
• Rated operational voltage: 690 V AC
• Number of poles: 3
• Rated ultimate short-circuit breaking capacity (Icu) at 400 V AC: 100 kA
• Rated service short-circuit breaking capacity (Ics) at 400 V AC: 100 kA
• Rated impulse withstand voltage (Uimp): 6 kV
• Rated insulation voltage (Ui): 690 V
• Degree of protection: IP20 (main circuit terminals)
• Mounting: DIN rail
• Terminal type: screw terminals
• Standards: IEC/EN 60947-1, -2, -4-1
• Ambient air temperature (operation): -25 to +70 °C
• Power loss: 4.2 W
• Electrical durability: 100,000 cycles
• Mechanical durability: 100,000 cycles
• Magnetic trip current (Im): 170 A

Recommendations

For optimal motor protection, set the thermal overload release to the motor's rated current. Ensure proper ventilation and comply with local installation regulations. Use appropriate screw torque for reliable connections.