ABB MS132-0.63 Motor Protection Circuit Breaker, 0.63 A, 3-Pole, Thermal-Magnetic, 100 kA at 400 V

With a rated short-circuit breaking capacity of 100 kA at 400 V AC, the ABB MS132-0.63 motor protection circuit breaker delivers uncompromising protection for motors and branch circuits. This 3-pole device combines thermal overload and magnetic short-circuit protection in a compact 45 mm width, ensuring reliable operation and quick fault clearance in industrial environments.

Overview

The ABB MS132-0.63 is a manual motor starter and circuit breaker in one, engineered for demanding applications up to 690 V AC. Its thermal-magnetic trip unit provides precise overload protection with an adjustable setting range of 0.4 to 0.63 A, while the fixed magnetic trip at approximately 9.5 times the rated current (about 6 A) instantly disconnects on short circuits. The rotary handle offers clear ON/OFF indication and can be padlocked in the OFF position for lockout/tagout procedures. Designed for DIN rail mounting (TH35-15 or TH35-7.5), it integrates seamlessly into control panels and motor control centers.

What stands out

• High breaking capacity: 100 kA at 400 V AC, 6 kA at 690 V AC, ensuring safety even on high-fault-current supplies.
• Wide voltage range: rated operational voltage up to 690 V AC, suitable for global industrial power systems.
• Precise thermal adjustment: overload setting from 0.4 to 0.63 A, allowing fine-tuning to motor full-load current.
• Compact 3-pole design: only 45 mm wide, saving valuable panel space.
• Robust construction: IP20 protection on main circuit terminals, operating temperature range -25 to +70 °C.

Technical details

• Rated operational current (Ie): 0.63 A
• Rated operational voltage (Ue): 690 V AC
• Number of poles: 3
• Thermal overload protection setting range: 0.4 - 0.63 A
• Magnetic short-circuit trip setting: 9.5 x Ie (approx. 6 A)
• Rated short-circuit breaking capacity (Icu) at 400 V AC: 100 kA
• Rated short-circuit breaking capacity (Icu) at 690 V AC: 6 kA
• Rated impulse withstand voltage (Uimp): 6 kV
• Rated insulation voltage (Ui): 690 V
• Tripping characteristic: Thermal-magnetic
• Actuator type: Rotary handle
• Mounting type: DIN rail (TH35-15, TH35-7.5)
• Connection type: Screw terminals
• Degree of protection: IP20 (Main Circuit Terminals)
• Ambient air temperature (operation): -25 to +70 °C
• Standards: IEC/EN 60947-1, IEC/EN 60947-2, IEC/EN 60947-4-1
• Power loss per pole: 0.8 W

Our verdict

The ABB MS132-0.63 is a top-tier motor protection circuit breaker that combines high breaking capacity, precise thermal adjustment, and a compact footprint. It is an excellent choice for protecting small motors in industrial settings where reliability and safety are paramount.