ABB MS116-0.25 Motor Protection Circuit Breaker, 0.16-0.25 A, 3-Pole, Class 10

The ABB MS116-0.25 stands apart from standard miniature circuit breakers by combining thermal overload and magnetic short-circuit protection in a single compact device, specifically engineered for motors with rated currents between 0.16 and 0.25 A. Its Class 10 trip characteristic ensures rapid disconnection under locked-rotor conditions, reducing the risk of winding damage and downtime.

Highlights

• Adjustable thermal overload release from 0.16 to 0.25 A for precise motor protection
• Fixed magnetic short-circuit release at 3.25 A (13 × I_{u max}) for instantaneous fault clearing
• High breaking capacity: 100 kA at 400 V AC and 50 kA at 690 V AC
• Phase failure sensitivity prevents single-phasing damage
• Compact 45 mm width saves space in control panels
• Screw terminals accept both solid and stranded conductors up to 6 mm²
• DIN rail or screw mounting for flexible installation

In daily use

Installation is straightforward: snap the MS116-0.25 onto a 35 mm DIN rail or secure it with two M4 screws. Connect the three-phase supply and motor leads to the clearly marked screw terminals, then set the thermal release dial to the motor's full-load current. During operation, the breaker's thermal element responds to sustained overloads, while the magnetic element trips instantly on short circuits. A clear red/green indicator shows the contact position, and the device can be manually switched off for maintenance. The IP20 housing is suitable for enclosed panels, and the operating temperature range of -25 to +70 °C covers most industrial environments.

Full specifications

• Brand: ABB
• Model: MS116-0.25
• MPN: 1SAM250000R1002
• EAN: 4013614320255
• Rated operational current: 0.16–0.25 A (adjustable)
• Number of poles: 3
• Trip class: 10
• Rated operational voltage (U_e): 690 V AC
• Rated impulse withstand voltage (U_imp): 6 kV
• Rated short-circuit breaking capacity (I_cu): 100 kA at 400 V AC, 50 kA at 690 V AC
• Overload protection: thermal
• Short-circuit protection: magnetic
• Short-circuit release setting (I_i): 3.25 A (fixed)
• Phase failure sensitivity: yes
• Mounting: DIN rail or screw
• Terminal type: screw terminals
• Degree of protection: IP20 (main circuit)
• Ambient air temperature: -25 to +70 °C
• Standards: IEC/EN 60947-1, IEC/EN 60947-2, IEC/EN 60947-4-1
• Auxiliary contacts: none integrated (optional external)

Final note

For reliable motor protection in a compact footprint, the ABB MS116-0.25 delivers precise thermal adjustment, high breaking capacity, and proven compliance with international standards.