Motor Protector MS116-6.3 4.0-6.3A

The ABB MS116-6.3 motor protection circuit breaker, reference 1SAM250000R1009, is a 3-pole manual motor protection switch designed to switch and protect electric motors against overloads, short circuits and phase failure. It features a thermal adjustment range of 4.0 to 6.3 A and is especially suitable for motors up to 2.2 kW at 400 V AC-3.

This motor protection circuit breaker from the ABB MS116 series combines in a compact device the functions of isolation, manual switching and thermal-magnetic protection. Its service breaking capacity reaches 50 kA at 400 V AC, allowing the motor circuit to be protected without the need for additional fuses when the installation characteristics are within ABB’s specified limits.

Complete protection for electric motors

The ABB MS116-6.3 is specifically designed to protect motors against the main electrical faults that may occur during operation.

• Overload protection: adjustable thermal setting between 4.0 and 6.3 A.
• Short-circuit protection: instantaneous magnetic trip calibrated at 78.8 A.
• Phase-failure sensitivity: helps protect the motor when one phase is lost.
• Trip class: 10A.
• Free-trip mechanism: operates even if the handle is manually held in the ON position.

The setting current must be configured according to the rated current of the motor to be protected, always within the 4.0 to 6.3 A range.

For motors up to 2.2 kW at 400 V

ABB specifies a rated operational power of 2.2 kW at 400 V in AC-3 category for the MS116-6.3. This makes it a suitable solution for many three-phase motors used in pumps, fans, machinery, HVAC systems and other industrial or commercial applications.

The device is suitable for both three-phase and single-phase applications, provided that the connection and adjustment are carried out according to ABB’s technical instructions.

Adjustment range from 4.0 to 6.3 A

The thermal protection of the motor protection circuit breaker can be precisely adjusted between 4.0 and 6.3 A. This setting allows the protection to be adapted to the rated current indicated on the motor nameplate.

Correct adjustment helps protect the winding against prolonged overloads and avoids selecting a device with a fixed current that does not match the motor’s actual requirements.

High breaking capacity

The ABB MS116-6.3 offers a service breaking capacity Ics of 50 kA at 400 V AC. This provides a high interruption capability against short-circuit currents within the conditions specified by the manufacturer.

The instantaneous magnetic trip is set at 78.8 A, enabling fast operation in the event of short circuits and helping to limit the damage that high current could cause to the motor and wiring.

Thermal-magnetic protection class 10A

The device uses a thermal-magnetic tripping system. The thermal part responds to sustained overloads, while the magnetic protection acts almost instantaneously when a high short-circuit current occurs.

Trip class 10A is especially suitable for motor applications with conventional starting conditions and provides proper coordination between starting time and overload protection.

Temperature compensation

The MS116 incorporates temperature compensation between -25 and +55 °C, helping to maintain the thermal protection performance within this compensated operating range.

ABB specifies a general operating temperature range of -25 to +70 °C and a storage range of -50 to +80 °C.

Rotary handle with clear status indication

The motor protection circuit breaker includes a front rotary handle that allows the circuit to be manually switched on and off. Its design provides a clear visual indication of the ON and OFF positions, making it easier to monitor the device status.

The MS116 also features an integrated isolating function, allowing it to be used as a disconnecting element within ABB’s defined conditions.

Compact 45 mm design

With only 45 mm width, the ABB MS116-6.3 makes efficient use of the available space inside electrical panels and automation cabinets.

• Width: 45 mm.
• Height: 90 mm.
• Depth: 85.6 mm.
• Approximate net weight: 0.265 kg.

Its compact dimensions make it easy to integrate alongside contactors and other motor protection and control components.

Connection via screw terminals

The main circuit uses screw connection terminals, a common solution in industrial electrical panels for its robustness and ease of maintenance.

The device has 3 poles and is designed for panel mounting, and can be combined with other ABB family components to create complete motor starters.

IP20 protection rating

The motor protection circuit breaker housing has an IP20 protection rating. ABB specifies IP10 for the main circuit terminals.

As with this type of electrical device, it must be installed inside an enclosure or panel that provides the degree of protection required by the environmental conditions and by the regulations applicable to each installation.

Wide range of ABB accessories

The MS116 series can be complemented with different accessories to expand the signalling, control and protection functions of the assembly.

• Auxiliary contacts.
• Signalling contacts.
• Undervoltage releases.
• Shunt releases.
• Supply blocks.
• Three-phase distribution bars.
• Locking devices to prevent unauthorized operation.

The availability and compatibility of each accessory should be checked according to the specific electrical panel configuration.

Technical characteristics of the ABB MS116-6.3

• Brand: ABB.
• Reference: 1SAM250000R1009.
• Model: MS116-6.3.
• Type: motor protection circuit breaker / manual motor protection switch.
• Number of poles: 3.
• Thermal adjustment range: 4.0-6.3 A.
• Rated operational current: 6.3 A.
• Rated power at 400 V AC-3: 2.2 kW.
• Trip class: 10A.
• Protection: thermal-magnetic.
• Instantaneous magnetic trip: 78.8 A.
• Service breaking capacity Ics at 400 V AC: 50 kA.
• Rated insulation voltage Ui: 690 V.
• Rated frequency: 50/60 Hz.
• Overload protection: yes.
• Short-circuit protection: yes.
• Phase-failure sensitivity: yes.
• Isolating function: yes.
• Free-trip mechanism: yes.
• Actuation: rotary handle.
• Connection: screw terminals.
• Housing protection rating: IP20.
• Width: 45 mm.
• Height: 90 mm.
• Depth: 85.6 mm.
• Approximate net weight: 0.265 kg.

A compact solution for motor protection and switching

The ABB MS116-6.3 motor protection circuit breaker with 4.0 to 6.3 A range combines manual switching, isolation and motor protection against overloads, short circuits and phase loss in a single compact device. Its 45 mm width helps optimize space in the electrical panel, while its 50 kA breaking capacity at 400 V provides a high level of protection.

With a rated power of 2.2 kW at 400 V AC-3, adjustable setting, 10A trip class and compatibility with numerous ABB accessories, it is a suitable solution for motor control and protection panels in industrial, commercial and technical installations.

Important: to ensure proper protection, the motor protection circuit breaker adjustment range must include the motor’s actual rated current. The final setting must be made according to the motor nameplate and the installation conditions.