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

Star-Delta Timer

Specialized time relay for controlling the star-to-delta starting sequence of an electric motor.

A star-delta timer controls the timing sequence of contactors during starting of a three-phase motor using a star-delta arrangement.

After starting, the motor first operates with its windings connected in star. After the configured period, the star output is deactivated and, after the specified dead time, the delta output is activated.

The dead time between contactors helps prevent simultaneous energization and reduces the risk of electrical or mechanical damage.

Depending on the model, the star-running time and transition time may be fixed or adjustable.

Selection criteria include the main timing range, star-delta transition time and tolerance, output topology, mutual interlocking, and contact characteristics.

Components in this subcategory

This subcategory includes star-delta time relays and specialized timers for controlling contactors in three-phase motor starting circuits.

Available parameters

Star-Delta Timer

160 parameters
General6
Product Series

Commercial or technical designation of a manufacturer's product family sharing a common design and compatible characteristics.

Application

Range of tasks and systems for which the manufacturer recommends the component.

Intended Use

Primary function of the device and its intended use as defined by its design and the manufacturer's documentation.

Installation Location

Permissible installation location of the product: indoors, outdoors, in a technical area, or as part of equipment.

Installation Environment

Environmental conditions under which installation and operation of the product are permitted.

Orientation

Permissible spatial orientation of the component during installation and operation.

Dimensions3
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.

Capacity and Layout5
Timing Function Mode Count

Number of distinct selectable timing operating modes provided by the product.

Timing Range Count

Number of selectable timing ranges provided by the product.

Timing Control Input Count

Number of dedicated external timing-control inputs.

Timed Output Count

Number of output channels whose switching state is controlled by the selected timing function.

Instantaneous Output Count

Number of outputs that operate instantaneously rather than according to the configured time delay.

Materials and Finish5
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.

Material

Primary material from which the product is manufactured.

Material Grade

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

Mounting and Installation5
DIN Rail Type

Profile type of the DIN rail installed in the product or specified for compatible mounting.

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.

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.

Electrical Parameters58
Supply Current Type

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

Rated FrequencyHz

AC frequency assigned to the product for normal operating conditions.

Auxiliary Supply VoltageV

Rated external auxiliary supply voltage required for the product's active functions.

Auxiliary Supply Type

Type of current and source used for the product's auxiliary supply.

Conductor Connection Type

Conductor connection methods supported by the specified terminals or connection elements.

Terminal Tightening TorqueNm

Tightening torque specified by the manufacturer for a screw or bolted terminal connection.

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.

Insulation Type

Type of electrical insulation used, considered in terms of its protective function and construction.

Electrical Protection Class

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

Utilization Category

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

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.

Relay Output Count

Number of independent relay outputs or sets of switching contacts provided by the product.

Relay Output Contact Configuration

Contact configurations provided for the product relay outputs.

Relay Output Functions

Functions permanently assigned or assignable to the product relay outputs.

Relay Contact Maximum Switching VoltageV

Maximum manufacturer-declared voltage that may be switched by the relay-output contacts.

Relay Contact Maximum Switching CurrentA

Maximum manufacturer-declared current that may be switched by the relay-output contacts.

Relay Contact Maximum Switching PowerW

Maximum manufacturer-declared active power that may be switched by the relay-output contacts.

Minimum Conductor Cross-Sectionmm²

Minimum conductor cross-section permitted by the connection system within its general conductor-size range.

Maximum Conductor Cross-Sectionmm²

Maximum conductor cross-section permitted by the connection system within its general conductor-size range.

Minimum Stripping Lengthmm

Minimum conductor stripping length specified by the manufacturer.

Maximum Stripping Lengthmm

Maximum conductor stripping length specified by the manufacturer.

Normally Open Relay Contact Count

Number of normally open switching contact sets provided by the relay.

Normally Closed Relay Contact Count

Number of normally closed switching contact sets provided by the relay.

Changeover Relay Contact Count

Number of changeover contact sets provided by the relay.

Relay Contact Structure

Mechanical structure of an individual switching contact system, for example single, double or bifurcated contact.

Relay Contact Material

Electrical contact material or contact-material system used by the relay switching contacts.

Relay Contact Minimum Switching VoltageV

Minimum manufacturer-declared switching voltage for reliable operation of the relay contact.

Relay Contact Minimum Switching CurrentA

Minimum manufacturer-declared switching current for reliable relay-contact operation.

Relay Contact Limiting Continuous CurrentA

Maximum continuous current permitted through a closed relay contact under the manufacturer-declared conditions.

Relay Contact Maximum Inrush CurrentA

Maximum short-duration inrush current permitted through the relay switching contact.

Relay Contact Maximum AC Switching VoltageV

Maximum AC switching voltage of the relay output contact.

Relay Contact Maximum DC Switching VoltageV

Maximum DC switching voltage of the relay output contact.

Relay Contact Maximum Switching Apparent PowerVA

Maximum manufacturer-declared AC switching capacity of the relay contacts expressed as apparent power.

Relay Contact ResistancemΩ

Manufacturer-declared electrical resistance of a closed relay switching contact under the specified measurement condition.

Minimum Timing Ranges

Minimum configurable timing duration supported by the product. Stored in seconds; UI may convert to ms, min, h or days.

Maximum Timing Ranges

Maximum configurable timing duration supported by the product. Stored in seconds; UI may convert to min, h or days.

Timing Setting Resolutions

Smallest manufacturer-supported increment of the configurable timing value.

Timing Setting Accuracy%

Manufacturer-declared accuracy of the set timing value, normally expressed relative to the selected range or full-scale value.

Timing Repeat Accuracy%

Repeat accuracy of the timing function under constant operating and reference conditions.

Timing Accuracy versus Supply Variation%/V

Change of timing accuracy caused by variation of the supply or control voltage.

Timing Accuracy Temperature Coefficient%/K

Change of timing accuracy per degree of ambient temperature variation.

Timing Recovery Timems

Minimum manufacturer-declared time required after completion, reset or supply interruption before the timing function can reliably start a new timing cycle.

Timing Power-Failure Buffer Timems

Duration of a short supply interruption that does not cause unintended loss or restart of the active timing operation.

Timing Control Input Type

Electrical interface type accepted by the dedicated timing-control input.

Minimum Timing Control Input Pulse Durationms

Minimum duration of an external timing-control signal required for reliable recognition.

Maximum Timing Control Input Cable Lengthmm

Maximum manufacturer-declared cable length for the external timing-control input. Stored in mm; UI may display metres.

Star-Delta Transition Timems

Manufacturer-declared nominal or fixed dead time between deactivation of the star output and activation of the delta output.

Minimum Star-Delta Transition Timems

Minimum configurable dead time between switching from star to delta.

Maximum Star-Delta Transition Timems

Maximum configurable dead time between switching from star to delta.

Star-Delta Transition Time Tolerancems

Manufacturer-declared absolute tolerance of the star-delta transition dead time.

Star-Delta Output Topology

Functional contact topology used to provide the dedicated star and delta control outputs.

Standby Power ConsumptionW

Manufacturer-declared electrical power consumption while the product is energized but not actively switching the controlled load.

Protection and Safety10
Halogen-Free

Indicates whether the product material is classified as halogen-free according to the characteristics declared by the manufacturer.

IP Rating

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

IK Rating

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

Protection Against Direct Contact

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

Finger-Safe

Indicates whether the design prevents finger access to hazardous live parts in the intended condition.

Touch-Safe

Indicates whether the design provides protection against accidental contact with hazardous live parts.

Flammability Class

Classification of a material according to its ability to ignite, sustain combustion, and cease burning under a specified test.

Glow-Wire Test Temperature°C

Temperature of the heated wire used when testing the material or product against an ignition source.

Input-to-Output Galvanic Isolation

Indicates that galvanic isolation is provided between the relevant electrical input and output circuits of the product.

Star-Delta Output Mutual Exclusion

Indicates that the timing/output logic prevents simultaneous activation of the star and delta control outputs.

Environmental Conditions18
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.

Maximum 24-Hour Average Temperature°C

Maximum permissible average ambient temperature over a consecutive 24-hour period.

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 Transport Temperature°C

Minimum ambient temperature permitted during transportation of the product.

Maximum Transport Temperature°C

Maximum ambient temperature permitted during transportation of the product.

Temperature Derating Required

Indicates whether permissible electrical or thermal loading must be reduced as temperature changes.

Temperature Derating Start°C

Temperature above which the permissible product load must be reduced.

Temperature Derating Curve Available

Indicates whether the manufacturer has published the relationship between permissible product load and temperature.

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.

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.

Mechanical Shock Resistant

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

Included Equipment7
Documentation Included

Indicates whether documentation is included in the product's standard supply.

Installation Manual Included

Indicates whether an installation manual is included with the product.

Terminal Diagram Included

Indicates whether a terminal diagram is included with the product.

Status LED Count

Number of integrated LEDs used to indicate product status or operating modes.

Status Indicator Present

Indicates whether the product has a local visual or mechanical indicator of operating, fault, or end-of-life status.

Status Indicator Types

Types of local visual or mechanical status indication provided by the product design.

Timing Control Input Present

Indicates that a dedicated external input is provided for control of timing operation independently of the normal supply terminals.

Special Features11
Timing Functions

Timing operating functions supported by the product, such as ON-delay, OFF-delay, interval, flasher or star-delta timing.

Timing Value Setting Method

Methods supported for setting the actual timing value within the selected timing range.

Timing Range Selection Method

Methods supported for selecting the timing scale or timing range.

Timing State Retained on Power Loss

Indicates that elapsed timing state or timing progress can be retained across a supply interruption rather than being unconditionally reset.

Timing Control Input Functions

Functions that can be performed through the external timing-control input.

Output Timing Assignment Configurable

Indicates that outputs can be configured as timed, instantaneous or assigned differently depending on the selected operating function.

Timing Start Sources

Sources or events capable of starting the timing sequence.

Timing Trigger Modes

Signal-transition or level-sensitive trigger modes supported for starting or controlling the timing sequence.

Timing Trigger Mode Configurable

Indicates that the timing trigger mode can be selected or configured by the user.

Trigger Behaviour During Active Timing Period

Supported responses when another valid trigger is received while a timing period is already active.

Star-Delta Transition Time Adjustable

Indicates that the dead time between star-output deactivation and delta-output activation can be adjusted by the user.

Standards and Compliance22
Conformity Regions

Regions or markets for which the manufacturer declares regulatory or certification compliance of the product.

Certification and Conformity Marks

Certification, market-approval, or conformity marks applicable to the product.

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.

Certificate Number

Identification number of the certificate relating to the product or its certified version.

Certification Body

Name of the organization that issued the certificate or performed the relevant conformity assessment.

Third-Party Tested

Indicates whether the product was tested by an organization independent of the manufacturer.

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.

CSA Certified

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

TÜV Certified

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

VDE Certified

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

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 61812-1 Compliant

Compliance with applicable IEC 61812-1 requirements for time relays and coupling relays for industrial and residential use.

Logistics10
Net Weightkg

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

Gross Weightkg

Mass of the product together with its individual packaging and the accessories included in it.

Package Widthmm

External horizontal dimension of the product's individual package.

Package Heightmm

External vertical dimension of the product's individual package.

Package Depthmm

External depth dimension of the product's individual package.

Packaging Type

Design type of the product's individual or transport packaging.

Units per Package

Number of individual products contained in one packaging unit at the specified level.

Country of Origin

Country of origin of the goods declared for customs or commercial purposes.

HS Code

Commodity code under the international Harmonized Commodity Description and Coding System.

Combined Nomenclature Code

Commodity code under the Combined Nomenclature of the European Union.