TRASA3 Knowledge Base

Electrical Component Parameter Reference

An open technical reference for electrical component types, their applications, and selection parameters.

This material is also available in PL and RU.

Device description

Motor Protection Circuit Breaker

Switching and protective device for manual motor switching and protection against overload and short circuit.

A motor protection circuit breaker (MPCB) combines switching and protection functions for a motor circuit. It normally includes adjustable thermal or electronic overload protection together with fast short-circuit protection.

Key parameters include overload-current setting range, instantaneous pickup characteristics, trip class, phase-loss sensitivity, and switching capacity.

Selection takes into account motor voltage, current, power, frequency, phase configuration, winding connection, and starting method.

An MPCB may be used as a standalone device or as part of a combination motor controller together with a contactor and other protective devices.

Components in this subcategory

Motor protection circuit breakers, manual motor protectors, and motor-protective breakers for motor power circuits.

Available parameters

Motor Protection Circuit Breaker

180 parameters
Dimensions4
Widthmm

External horizontal dimension of the product between its outermost lateral points.

Heightmm

External vertical dimension of the product from its lowest to its highest point.

Depthmm

External distance between the foremost and rearmost surfaces of the product.

Net Weightkg

Mass of the product itself, excluding transport packaging, additional accessories, and external equipment.

Materials and Finish7
Material

Primary material from which the product is manufactured.

Material Grade

Grade, alloy, class, or technical designation of the product's primary material.

Color

Primary visually perceived colour of the product's external surface.

RAL Color

Designation of the product's primary surface colour according to the RAL colour system.

Surface Finish

Type of final surface finish of the product determining its appearance and service properties.

Surface Treatment

Technological surface treatment applied to modify its protective, mechanical, or decorative properties.

Coating Type

Type of protective, functional, or decorative coating applied to the surface.

Mounting and Installation23
Mounting Type

Installation arrangement permitted by the product design, such as wall-mounted, flush-mounted, floor-mounted, or another specified mounting type.

Mounting Method

Method used to mechanically secure the product to a support, surface, or load-bearing structure.

Mounting Surface

Type of surface or supporting base to which the product may be fixed.

Orientation

Permissible spatial orientation of the component during installation and operation.

Number of Mounting Holes

Number of holes provided in the product for mechanical fixing.

Mounting Hole Diametermm

Diameter of the hole provided for a fixing element used when mounting the product.

Horizontal Mounting Hole Spacingmm

Distance between the centres of mounting holes in the horizontal direction.

Vertical Mounting Hole Spacingmm

Distance between the centres of mounting holes in the vertical direction.

Mounting Pattern Widthmm

Horizontal dimension of the mounting pattern between the outermost fixing points of the product.

Mounting Pattern Heightmm

Vertical dimension of the mounting pattern between the outermost fixing points of the product.

Mounting Screw Size

Size designation of the screw, bolt, or other threaded fastener used for mounting the product.

Mounting Thread

Designation of the thread provided in the product's mounting holes or fixing elements.

Mounting Tightening TorqueNm

Tightening torque recommended or permitted for fasteners during product installation.

Fasteners Included

Indicates whether the required fasteners are included with the product.

DIN Rail Mounting Supported

Indicates whether the design provides for mounting equipment on a DIN rail.

Direct Device Mounting Supported

Indicates whether equipment may be mounted directly to the mounting surface without an intermediate DIN rail.

Required Top Installation Clearancemm

Minimum free space required above the product for installation, cooling, or servicing.

Required Bottom Installation Clearancemm

Minimum free space required below the product for installation, cooling, or servicing.

Required Left Installation Clearancemm

Minimum free space required to the left of the product for installation or servicing.

Required Right Installation Clearancemm

Minimum free space required to the right of the product for installation or servicing.

Required Front Installation Clearancemm

Minimum free space required in front of the product for installation and normal operation.

Required Rear Installation Clearancemm

Minimum free space required behind the product for installation and normal operation.

Maximum Mounting Tilt Angle°

Maximum angle permitted by the manufacturer by which the product may deviate from the specified reference orientation during installation.

Electrical Parameters47
Supply Current Type

Type of electrical current for which the product's main supply circuit is intended.

Rated VoltageV

Voltage value assigned to the product by the manufacturer for specified application conditions and characteristics.

Rated Operational VoltageV

Operating-circuit voltage with reference to which the product's performance characteristics are specified.

Minimum Operating VoltageV

Minimum voltage at which the manufacturer guarantees the intended operating mode of the product.

Maximum Operating VoltageV

Maximum voltage at which continuous operation of the product is permitted under the conditions declared by the manufacturer.

Rated FrequencyHz

AC frequency assigned to the product for normal operating conditions.

Minimum FrequencyHz

Lower limit of the electrical network or signal frequency at which product operation is permitted.

Maximum FrequencyHz

Upper limit of the electrical network or signal frequency at which product operation is permitted.

Rated CurrentA

Current assigned to the product by the manufacturer for the declared operating and thermal conditions.

Continuous Service CurrentA

Current that the product can carry continuously under the manufacturer's declared conditions without exceeding permissible temperature rise.

Rated Insulation VoltageV

Voltage with reference to which the product's insulation clearances and dielectric properties are specified.

Rated Impulse Withstand VoltagekV

Peak value of an impulse voltage of specified waveform that the product insulation must withstand without breakdown.

Dielectric Test VoltageV

Test voltage applied to verify the dielectric strength of the product insulation.

Minimum Insulation ResistanceMΩ

Minimum permissible insulation resistance between the specified electrically separated parts.

Overvoltage Category

Category characterizing the expected level of impulse overvoltages at the product's point of use.

Pollution Degree

Degree of pollution of the surrounding microenvironment considered when selecting insulation distances and product characteristics.

Electrical Protection Class

Class of protection against electric shock determined by the product design and protective connection method.

Supported Motor Types

Motor technologies and motor types that the product is designed to control, start, protect or drive.

Supported Motor Phase Configurations

Electrical phase configurations of motors supported by the product.

Supported Motor Winding Connections

Motor winding connection configurations supported by the product.

Minimum Supported Motor Rated VoltageV

Minimum motor rated voltage supported by the product.

Maximum Supported Motor Rated VoltageV

Maximum motor rated voltage supported by the product.

Minimum Supported Motor Rated CurrentA

Minimum motor rated current supported by the product.

Maximum Supported Motor Rated CurrentA

Maximum motor rated current supported by the product.

Minimum Supported Motor Rated PowerW

Minimum motor rated power supported by the product.

Maximum Supported Motor Rated PowerW

Maximum motor rated power supported by the product.

Minimum Supported Motor Rated FrequencyHz

Minimum motor rated frequency supported by the product.

Maximum Supported Motor Rated FrequencyHz

Maximum motor rated frequency supported by the product.

Minimum Supported Motor Rated Speedrpm

Minimum motor rated rotational speed supported by the product.

Maximum Supported Motor Rated Speedrpm

Maximum motor rated rotational speed supported by the product.

Minimum Supported Motor Pole Count

Minimum number of motor poles supported by the product.

Maximum Supported Motor Pole Count

Maximum number of motor poles supported by the product.

Minimum Supported Motor Service Factor

Minimum motor service factor supported or configurable for motor protection or control.

Maximum Supported Motor Service Factor

Maximum motor service factor supported or configurable for motor protection or control.

Supported Motor Starting Methods

Motor starting methods that the product can provide or manage.

Supported Motor Rotation Directions

Motor rotation directions that the product can control.

Rated Motor PowerW

Manufacturer-declared motor power associated with the stated operational voltage and utilization category. UI may display the value in kW.

Rated Motor Power Reference VoltageV

Operational voltage associated with the stored rated motor power.

Rated Motor Power Utilization Category

Utilization category to which the stored rated motor power applies.

Utilization Category

Manufacturer-declared utilization category defining the load characteristics and switching conditions according to the applicable standard.

Main Terminal Connection Type

Conductor connection technology used specifically for the main power terminals of the switching device.

Minimum Main Terminal Conductor Cross-Sectionmm²

Minimum conductor cross-section accepted by the main power terminal.

Maximum Main Terminal Conductor Cross-Sectionmm²

Maximum conductor cross-section accepted by the main power terminal.

Main Terminal Tightening TorqueNm

Manufacturer-declared tightening torque specifically for screw, bolt or clamp-type main power terminals.

Mechanical Endurancecycles

Declared number of mechanical operating cycles that the product can perform without electrical switching load.

Electrical Endurancecycles

Declared number of electrical load-switching cycles under the conditions specified by the manufacturer.

Rated Frame CurrentA

Rated current associated with the circuit-breaker frame or enclosure size, distinct from the actual protection setting where applicable.

Protection and Safety41
IP Rating

Degree of enclosure protection against access to hazardous parts and ingress of solid objects and water, designated by the IP code.

Front-Side IP Rating

IP degree of protection provided by the accessible front side of the product after its intended installation.

IK Rating

Class of enclosure resistance to external mechanical impacts designated by the IK code.

Ingress Protection Certified

Indicates whether the declared ingress protection of the enclosure has been verified by certification or testing.

Protection Against Direct Contact

Method or level of protection of the user against direct contact with hazardous live parts.

Motor Starter Coordination Type

IEC motor-starter short-circuit coordination type declared for combinations using the contactor.

Coordination Reference Short-Circuit CurrentkA

Prospective short-circuit current associated with the declared motor-starter coordination rating.

Coordination Reference VoltageV

Operational voltage associated with the declared motor-starter short-circuit coordination rating.

Short-Circuit Current RatingkA

Manufacturer-declared permissible short-circuit current value for the product or assembly under specified conditions.

Minimum Overload Current SettingA

Minimum adjustable overload current setting.

Maximum Overload Current SettingA

Maximum adjustable overload current setting.

Overload Current Setting StepA

Smallest selectable increment of the overload current setting.

Supported Overload Trip Classes

Standardized overload-relay trip classes supported or selectable by the product.

Motor Phase-Loss Sensitivity Supported

Indicates that the motor overload protection characteristic is specifically sensitive to single-phasing or phase-loss conditions through motor-current imbalance or an equivalent protection principle.

Trip Indicator Present

Indicates whether a local mechanical or electronic indicator shows that the circuit breaker has tripped protectively.

Overload Trip Cause Indicator Present

Indicates that an overload or thermal trip can be identified separately from other trip causes by a dedicated mechanical, visual or electronic indication.

Short-Circuit Trip Cause Indicator Present

Indicates that an instantaneous or short-circuit trip can be identified separately from overload and other trip causes.

Supported Reset Modes

Reset or restart modes supported after the condition that caused a trip, protection action, alarm or safety stop has been cleared.

Protection Functions

Set of protection functions integrated into the product or provided by it in its normal intended configuration.

Trip-Free Mechanism

Indicates whether the device has a mechanism that ensures protective tripping independently of the operating element being held in the ON position.

Test Button Present

Indicates whether the product has a local TEST button for the specified functional check of the device.

Trip Test Supported

Indicates whether a manufacturer-specified method is provided for functional testing of circuit-breaker or trip-unit operation.

Trip Unit Type

Technological or construction type of the trip unit that provides protective tripping of the circuit breaker.

Number of Protected Poles

Number of product poles equipped with overcurrent detection or another protective function that causes tripping.

Adjustable Trip Unit

Indicates whether one or more thresholds or timing parameters of the protective trip unit can be adjusted.

Rated Short-Circuit CapacitykA

Rated short-circuit breaking capacity Icn declared for the product according to the applicable standard and specified reference conditions.

Rated Ultimate Short-Circuit Breaking CapacitykA

Rated ultimate short-circuit breaking capacity Icu declared by the manufacturer for specified reference conditions.

Rated Service Short-Circuit Breaking CapacitykA

Rated service short-circuit breaking capacity Ics declared by the manufacturer for specified reference conditions.

Service Breaking Capacity Ratio%

Ratio of rated service short-circuit breaking capacity Ics to rated ultimate short-circuit breaking capacity Icu, expressed as a percentage.

Current Limiting

Indicates whether the circuit breaker is designed and declared as a current-limiting device.

Adjustable Instantaneous Pickup

Indicates whether the instantaneous overcurrent protection pickup threshold can be adjusted.

Minimum Instantaneous Pickup Ratio

Minimum supported instantaneous protection pickup setting, expressed as a multiple of the selected reference current.

Maximum Instantaneous Pickup Ratio

Maximum supported instantaneous protection pickup setting, expressed as a multiple of the selected reference current.

Instantaneous Pickup Reference

Reference current relative to which the instantaneous protection pickup ratio is defined.

Instantaneous Protection Disable Supported

Indicates whether the instantaneous protection function can be disabled.

Instantaneous Trip Modes

Supported instantaneous trip modes where the product provides more than one mode.

Instantaneous Pickup CurrentA

Fixed or manufacturer-declared nominal instantaneous overcurrent pickup current where the threshold is specified directly in amperes rather than as a multiple of another current.

Minimum Instantaneous Pickup CurrentA

Minimum configurable instantaneous overcurrent pickup current where the manufacturer specifies the setting directly in amperes.

Maximum Instantaneous Pickup CurrentA

Maximum configurable instantaneous overcurrent pickup current where the manufacturer specifies the setting directly in amperes.

Padlockable Positions

Switching positions in which the product design permits mechanical locking with a padlock.

Maximum Padlock Count

Maximum number of padlocks that may be fitted simultaneously to the provided locking mechanism.

Environmental Conditions19
Minimum Operating Temperature°C

Minimum ambient temperature at which normal operation of the product is permitted.

Maximum Operating Temperature°C

Maximum ambient temperature at which normal operation of the product is permitted.

Minimum Storage Temperature°C

Minimum ambient temperature permitted during storage of the product while not in operation.

Maximum Storage Temperature°C

Maximum ambient temperature permitted during storage of the product while not in operation.

Minimum Relative Humidity%

Minimum relative air humidity permitted for the declared operating or test condition.

Maximum Relative Humidity%

Maximum relative air humidity permitted for the declared operating or test condition.

Relative Humidity Reference Temperature°C

Temperature at which the corresponding relative humidity value is specified or standardized.

Humidity Condition

Nature of the humidity conditions for which product operation or resistance is declared.

Non-Condensing Humidity

Indicates whether the permissible humidity value applies only to non-condensing conditions.

Maximum Installation Altitudem

Maximum altitude above sea level at which the product may be installed without exceeding the declared conditions.

Altitude Derating Required

Indicates whether the permissible product load must be reduced as installation altitude increases.

Altitude Derating Startm

Altitude above sea level above which the permissible product load must be reduced.

Vibration Resistant

Indicates whether the product's resistance to vibration has been verified under the declared conditions.

Minimum Vibration FrequencyHz

Lower limit of vibration frequency applied or permitted in the relevant test.

Maximum Vibration FrequencyHz

Upper limit of vibration frequency applied or permitted in the relevant test.

Vibration Accelerationm/s²

Amplitude or test-method-specified acceleration of vibration applied during product testing.

Mechanical Shock Resistant

Indicates whether the product's resistance to short-duration mechanical shocks has been verified.

Shock Accelerationm/s²

Maximum acceleration generated during mechanical shock testing of the product.

Shock Durationms

Duration of an individual mechanical shock pulse during product testing.

Included Equipment11
Auxiliary Contacts Supported

Indicates whether the product supports installation or connection of specified auxiliary contacts.

Auxiliary Contacts Included

Indicates whether one or more auxiliary contacts are included in the standard product configuration.

Normally Open Auxiliary Contact Count

Number of normally open (NO) auxiliary contacts installed in or supplied with the product.

Normally Closed Auxiliary Contact Count

Number of normally closed (NC) auxiliary contacts installed in or supplied with the product.

Changeover Auxiliary Contact Count

Number of changeover auxiliary contacts installed in or supplied with the product.

Local Control Element Included

Indicates whether a local control element such as a handle, lever, rotary element, or similar device is supplied with the product.

Door-Coupling Operation Supported

Indicates whether the product is compatible with a mechanism that transmits motion from a control element mounted on a cabinet door.

Extension Shaft Supported

Indicates whether the product is compatible with an extension shaft for remote mechanical transmission of operating motion.

Shunt Trip Supported

Indicates whether the product is compatible with a shunt trip for electrically commanded opening.

Undervoltage Release Supported

Indicates whether the product is compatible with an undervoltage release.

Position Auxiliary Contact Supported

Indicates whether an auxiliary contact for electrical signalling of the main switching mechanism position is supported.

Special Features8
Suitable for Isolation

Indicates whether the switching device is declared suitable for providing an isolation function.

Positive Contact Position Indication

Indicates whether a positive mechanical relationship exists between the position indication and the actual position of the main contacts.

Visible Contact Position Indication

Indicates whether visible indication is provided to determine the position of the main switching contacts.

Operating Mechanism

Type of mechanism that transmits the operating action to the main switching contacts of the product.

Control Element Type

Type of physical local control element used to operate the product.

Number of Switch Positions

Number of defined functional positions of the product's main switching mechanism.

Switching Position Configuration

Functional sequence or designation of the switching positions provided by the product.

Manual Operation Supported

Indicates whether direct manual operation of the product's main switching function is supported.

Standards and Compliance20
Primary Product Standard

Primary normative document or standard according to which the manufacturer classifies or assesses the product.

Additional Standards

Additional normative documents and standards declared by the manufacturer as applicable to the product.

Declaration of Conformity Available

Indicates whether an official declaration of conformity is available for the product.

Certificate Available

Indicates whether a certificate relating to the declared certification or conformity of the product is available.

CE Marked

Indicates whether the CE marking is applied to the product where applicable.

UKCA Marked

Indicates whether the UKCA marking is applied to the product where applicable.

EAC Marked

Indicates whether the EAC marking is applied to the product where applicable.

UL Listed

Indicates whether the product has a declared UL Listed certification or recognition status.

UL Recognized

Indicates whether the product has a declared UL Recognized certification or recognition status.

cULus Marked

Indicates whether the cULus mark is applied to the product where applicable.

IEC 60529 Compliant

Indicates whether the manufacturer declares product compliance with IEC 60529.

IEC 62262 Compliant

Indicates whether the manufacturer declares product compliance with IEC 62262.

IEC 60068 Tested

Indicates whether the product has been tested according to applicable methods of the IEC 60068 series.

RoHS Compliant

Indicates whether product compliance with applicable RoHS restrictions on hazardous substances has been declared.

REACH Compliant

Indicates whether the manufacturer declares compliance of the product with applicable REACH Regulation requirements.

WEEE Applicable

Indicates whether the product falls within the scope of WEEE requirements for waste electrical and electronic equipment.

IEC 60947-4-1 Compliant

Compliance with IEC 60947-4-1 requirements applicable to electromechanical contactors and motor-starters.

UL 60947-4-1 Compliant

Compliance with UL 60947-4-1 requirements applicable to contactors and motor-starters.

IEC 60947-2 Compliant

Indicates declared compliance of the product with the applicable IEC 60947-2 requirements for low-voltage circuit breakers.

Combination Motor Controller Configuration Types

Manufacturer-declared combination motor controller configurations for which the product or tested combination is certified, including applicable Type E or Type F arrangements.