Motor Protector MS116-4.0 2.5-4A

The ABB MS116-4.0 motor protection circuit breaker, reference 1SAM250000R1008, is a manual motor protection switch with a thermal adjustment range of 2.5 to 4 A. It integrates thermal overload protection and electromagnetic short-circuit protection, as well as phase-loss sensitivity, allowing you to protect and control motors with a single compact device.

With 3 poles, trip class 10A and an operational breaking capacity of up to 50 kA at 400 V AC, the MS116-4.0 is suitable for single-phase and three-phase applications. For three-phase motors in AC-3 category, ABB specifies a rated power of up to 1.5 kW at 400 V.

Adjustment range from 2.5 to 4 A

The thermal trip unit of the ABB MS116-4.0 can be adjusted between 2.5 and 4 A to match the protection to the rated current of the installed motor.

The setting should be made according to the motor nameplate data and the characteristics of the installation, allowing the motor protection circuit breaker to respond to sustained overloads without replacing the complete device when using motors within this range.

Thermal and electromagnetic protection

The MS116 incorporates two main protection systems:

• Thermal protection: acts against prolonged overloads that can cause excessive motor heating.
• Electromagnetic protection: provides a fast response to high short-circuit currents.

The instantaneous magnetic trip of this reference is set to 50 A.

Phase-loss protection

The ABB MS116 motor protection circuit breaker is sensitive to phase loss. This feature is especially important in three-phase motors, since the absence of one phase can cause current imbalance, loss of torque and motor overheating.

Trip class 10A

The MS116-4.0 belongs to trip class 10A according to ABB specifications. This class defines the time behavior of the protection in overload situations and is especially suited to motors with conventional starting times.

50 kA breaking capacity at 400 V

ABB specifies for this reference a rated service short-circuit breaking capacity Ics of 50 kA at 400 V AC. Its ultimate breaking capacity Icu reaches 75 kA at the same voltage.

The values vary depending on the operating voltage:

• 230 V AC: Ics 50 kA / Icu 75 kA.
• 400 V AC: Ics 50 kA / Icu 75 kA.
• 440 V AC: Ics 6 kA / Icu 18 kA.
• 500 V AC: Ics 6 kA / Icu 15 kA.
• 690 V AC: Ics 2 kA / Icu 3 kA.

Up to 1.5 kW at 400 V in AC-3

For applications with three-phase motors in AC-3 utilization category and 400 V supply, ABB specifies an operating rated power of up to 1.5 kW for the MS116-4.0.

The final selection should be made according to the rated current indicated by the motor manufacturer, as this is the main reference for correctly setting the thermal protection.

3 poles for three-phase motors and single-phase applications

The MS116-4.0 has 3 main poles. It is especially suitable for three-phase motor protection, although ABB also considers the use of the MS116 family in single-phase applications following the corresponding connection diagram.

Integrated isolating function

In addition to protecting the motor, the device incorporates an isolator function. The rotary handle allows the circuit to be manually switched on and off, providing clear ON and OFF position indication.

This function allows the motor protection circuit breaker to be used as a manual control and isolation device within the limits and conditions established by ABB.

Free-trip mechanism

The MS116 integrates a free-trip mechanism. This means that the device can open its contacts when protection is triggered even if the handle is manually kept in the ON position.

This feature prevents operation of the control from interfering with the automatic action of the internal protections.

Temperature compensation

The thermal protection includes compensation for ambient temperature variations. ABB specifies a compensated operating range for the MS116 series between -25 and +55 °C.

This feature helps maintain stable thermal trip performance under normal temperature variations inside the electrical panel.

Compact 45 mm design

The ABB MS116-4.0 has a width of only 45 mm, making it easy to install in automation and control panels where space is limited.

Its approximate dimensions are 45 mm wide, 85.6 mm high and 90 mm deep, with an approximate net weight of 265 g.

DIN rail mounting

The motor protection circuit breaker is designed for mounting on standardized DIN rail, making it easy to integrate alongside contactors, relays, auxiliary devices and other protection and switching components.

The main circuit is connected via screw terminals.

Wide range of ABB accessories

The MS116 family supports numerous accessories that expand the functions of the motor protection circuit breaker according to the needs of the installation. Available options include:

• Auxiliary contacts.
• Signaling contacts.
• Undervoltage releases.
• Shunt trips.
• Three-phase comb busbars and distribution bars.
• Feeder blocks.
• Locking accessories against unauthorized operation.

These accessories are sold separately and must be selected according to the specific panel configuration.

IP20 protection rating

The motor protection circuit breaker has an IP20 enclosure rating. It is designed to be installed inside suitable electrical panels or enclosures that provide the additional protection required against contact and environmental conditions.

Applications of the ABB MS116-4.0

• Three-phase motor protection.
• Electric pumps.
• Fans and extractors.
• Compatible compressors.
• Industrial machinery.
• HVAC systems.
• Conveyor belts.
• Automation and control panels.
• Equipment with motors up to 1.5 kW at 400 V within the indicated current range.

Technical characteristics of the ABB MS116-4.0

• Brand: ABB.
• Reference: 1SAM250000R1008.
• Model: MS116-4.0.
• Type: motor protection circuit breaker / manual motor protection switch.
• Number of poles: 3.
• Maximum rated current Ie: 4 A.
• Thermal adjustment range: 2.5-4 A.
• Trip class: 10A.
• Thermal overload protection: yes.
• Electromagnetic short-circuit protection: yes.
• Phase-loss sensitivity: yes.
• Instantaneous magnetic trip setting Ii: 50 A.
• Ics at 230 V AC: 50 kA.
• Ics at 400 V AC: 50 kA.
• Ics at 440 V AC: 6 kA.
• Ics at 500 V AC: 6 kA.
• Ics at 690 V AC: 2 kA.
• Icu at 230 V AC: 75 kA.
• Icu at 400 V AC: 75 kA.
• Icu at 440 V AC: 18 kA.
• Icu at 500 V AC: 15 kA.
• Icu at 690 V AC: 3 kA.
• Rated operational voltage Ue: up to 690 V AC.
• Rated insulation voltage Ui: 690 V.
• Frequency: 50/60 Hz.
• Rated power AC-3 at 400 V: 1.5 kW.
• Isolator function: yes.
• Operation: ON/OFF rotary handle.
• Free-trip mechanism: yes.
• Temperature compensation: yes.
• Operating temperature range: -25 to +55 °C.
• Connection type: screw terminals.
• Mounting: DIN rail.
• Protection rating: IP20.
• Width: 45 mm.
• Height: approximately 85.6 mm.
• Depth: approximately 90 mm.
• Net weight: approximately 0.265 kg.
• EAN: 4013614320316.

Complete and compact motor protection

The ABB MS116-4.0 combines protection against overloads, short circuits and phase loss with switching, disconnection and isolation functions in a device only 45 mm wide. Its 2.5 to 4 A adjustment range allows the protection to be adapted to different motors within this current range.

The 10A trip class, 50 kA service breaking capacity at 400 V and the possibility of combining it with ABB accessories make the 1SAM250000R1008 a particularly suitable solution for electrical panels in machinery, pumps, ventilation and industrial automation.

Important: the thermal setting must be configured according to the motor’s actual rated current. Auxiliary contacts, releases and other accessories are not part of the standard motor protection circuit breaker and must be purchased separately when needed.