ST Spring-Cage Feed-Through Terminal Blocks

ST1.5 Two Connection Terminal
ST1.5 TWIN Terminal in DIN Rail Assembly
ST2.5 Two Connection Terminal
ST2.5 TWIN Three Connection Terminal
ST2.5 QUATTRO Four Connection Terminal
ST4 Two Connection Terminal
ST4 TWIN Three Connection Terminal
ST4 QUATTRO Four Connection Terminal
ST6 Two Connection Terminal
ST6 TWIN Three Connection Terminal
ST10 Two Connection Terminal

Series Part Number

Part Number: ULO - TB252 - ST2.5 - QUATTRO BU
Explanation:

Brand

Product Code

TB250 - ST1.5 TWIN model
TB252 - ST2.5 TWIN and QUATTRO models
TB259 - ST4 TWIN and QUATTRO models
TB261 - ST6 TWIN model; this breakdown covers the six TWIN/QUATTRO versions

Base Model

ST1.5 - 1.5mm² nominal cross-section; TB250 only
ST2.5 - 2.5mm² nominal cross-section; TB252 only
ST4 - 4mm² nominal cross-section; TB259 only
ST6 - 6mm² nominal cross-section; TB261 only

Connections and Color

TWIN - Three connections, gray; all four base models
TWIN BU - Three connections, blue; all four base models
QUATTRO - Four connections, gray; ST2.5 or ST4 only
QUATTRO BU - Four connections, blue; ST2.5 or ST4 only; omit BU and its preceding space for gray; all versions have one level and one potential

Description

Single-level feed-through connections

ST terminals use spring-cage connections on NS35/7.5 DIN rails. Standard terminals have two connection points, TWIN terminals have three and QUATTRO terminals have four. Each terminal has one level and one electrical potential. Choose the nominal conductor size, connection count and electrical rating together; additional connection points do not create isolated circuits.

ModelConnectionsNominal cross sectionNominal currentMaximum load currentIEC rated voltageRated impulse voltage
ULO-TB250-ST1.521.5mm²17.5A17.5A500V6kV
ULO-TB250-ST1.5-TWIN3
ULO-TB252-ST2.522.5mm²24A31A800V8kV
ULO-TB252-ST2.5-TWIN328A
ULO-TB252-ST2.5-QUATTRO4
ULO-TB259-ST424mm²32A40A
ULO-TB259-ST4-TWIN3
ULO-TB259-ST4-QUATTRO4
ULO-TB261-ST626mm²41A52A1000V
ULO-TB261-ST6-TWIN3
ULO-TB263-ST10210mm²57A65A

IEC voltage and impulse ratings above apply to overvoltage category III, pollution degree 3. Ratings for category III/pollution degree 2 and category II/pollution degree 2 are not specified. Maximum load current is a separate limit and does not replace the nominal current or the applicable conductor rating.

Conductor selection and preparation

ModelsSolid conductorSolid AWGFlexible conductorFlexible AWGFlexible with ferruleStrip length
ST1.5, ST1.5-TWIN0.08-1.5mm²28-16AWG0.08-1.5mm²28-16AWG0.14-1.5mm²8-10mm
ST2.5, ST2.5-TWIN, ST2.5-QUATTRO0.08-4mm²28-12AWG0.08-2.5mm²28-14AWG0.14-2.5mm²
ST4, ST4-TWIN, ST4-QUATTRO0.08-6mm²28-10AWG0.08-4mm²28-12AWG0.14-4mm²
ST6, ST6-TWIN0.2-10mm²24-8AWG0.2-6mm²24-10AWG0.25-6mm²12mm
ST100.2-16mm²24-6AWG0.2-10mm²24-8AWG0.25-10mm²18mm

The connections use spring cages; a locking screw size and screw tightening torque are not applicable. Keep the conductor ranges above separate from the UL use-group wire ranges below.

UL use-group ratings

ModelsUse groupRated currentRated voltageWire range
ST1.5, ST1.5-TWINB15A300V26-14AWG
ST2.5, ST2.5-TWIN, ST2.5-QUATTRO20A600V28-12AWG
ST4, ST4-TWIN, ST4-QUATTRO30A28-10AWG
ST6, ST6-TWIN50A24-8AWG
ST1065A16-6AWG

Use-group C and D ratings are not specified.

Materials and operating conditions

PropertySpecification
Connection methodSpring-cage
Levels / potentials1 / 1
InsulationPA66; insulation material group I
Flammability classUL94V-0
Contact material / finishCopper alloy / tin plated
ProtectionIP20
Operating temperature-60°C to +110°C
MountingNS35/7.5 DIN rail

Dimensions and mounting outlines

Dimensions are width along the rail × terminal length × overall height. The separate height to the rail seating plane follows the dimension arrows in each outline.

ModelWidthLengthOverall heightHeight to rail seating plane
ST1.54.15mm48.6mm35.25mm29.25mm
ST1.5-TWIN60.4mm
ST2.55.15mm48.6mm
ST2.5-TWIN60.4mm
ST2.5-QUATTRO72.2mm
ST46.15mm55.9mm29.3mm
ST4-TWIN71.5mm35.3mm
ST4-QUATTRO87.1mm35.25mm29.25mm
ST68.15mm69.5mm42.2mm36.2mm
ST6-TWIN90.5mm
ST1010.15mm71.3mm49.6mm42.8mm
ST1.5 mounting outline
ST1.5: two connections, 4.15mm width and 48.6mm length.
ST1.5-TWIN mounting outline
ST1.5-TWIN: three connections, 4.15mm width and 60.4mm length.
ST2.5 mounting outline
ST2.5: two connections, 5.15mm width and 48.6mm length.
ST2.5-TWIN mounting outline
ST2.5-TWIN: three connections, 5.15mm width and 60.4mm length.
ST2.5-QUATTRO mounting outline
ST2.5-QUATTRO: four connections, 5.15mm width and 72.2mm length.
ST4 mounting outline
ST4: two connections, 6.15mm width and 55.9mm length.
ST4-TWIN mounting outline
ST4-TWIN: three connections, 6.15mm width and 71.5mm length.
ST4-QUATTRO mounting outline
ST4-QUATTRO: four connections, 6.15mm width and 87.1mm length.
ST6 mounting outline
ST6: two connections, 8.15mm width and 69.5mm length.
ST6-TWIN mounting outline
ST6-TWIN: three connections, 8.15mm width and 90.5mm length.
ST10 mounting outline
ST10: two connections, 10.15mm width and 71.3mm length.

Color and model references

The base ordering reference identifies gray; BU after the base reference identifies blue. The ST4 drawing also uses the reference ULO-TB130-ST4. Match the complete model and color reference when specifying an order.

ModelGray referenceBlue reference
ST1.5ULO-TB250-ST1.5ULO-TB250-ST1.5 BU
ST1.5-TWINULO-TB250-ST1.5-TWINULO-TB250-ST1.5-TWIN BU
ST2.5ULO-TB252-ST2.5ULO-TB252-ST2.5 BU
ST2.5-TWINULO-TB252-ST2.5-TWINULO-TB252-ST2.5-TWIN BU
ST2.5-QUATTROULO-TB252-ST2.5-QUATTROULO-TB252-ST2.5-QUATTRO BU
ST4ULO-TB130-ST4ULO-TB130-ST4 BU
ST4-TWINULO-TB259-ST4-TWINULO-TB259-ST4-TWIN BU
ST4-QUATTROULO-TB259-ST4-QUATTROULO-TB259-ST4-QUATTRO BU
ST6ULO-TB261-ST6ULO-TB261-ST6 BU
ST6-TWINULO-TB261-ST6-TWINULO-TB261-ST6-TWIN BU
ST10ULO-TB263-ST10ULO-TB263-ST10 BU

Matching accessories

ModelEnd coverPluggable bridgeMarker strips
ST1.5ULO-TB392-D-ST1.5ULO-TB390-FBS XX-4ULO-TB391-ZB4 / ZBF4
ST1.5-TWINULO-TB392-D-ST1.5-TWIN
ST2.5ULO-TB392-D-ST2.5ULO-TB390-FBS XX-5ULO-TB391-ZB5 / ZBF5
ST2.5-TWINULO-TB392-D-ST2.5-TWIN
ST2.5-QUATTROULO-TB392-D-ST2.5-QUATTRO
ST4ULO-TB392-D-ST4ULO-TB390-FBS XX-6ULO-TB391-ZB6 / ZBF6
ST4-TWINULO-TB392-D-ST4-TWIN
ST4-QUATTROULO-TB392-D-ST4-QUATTRO
ST6ULO-TB392-D-ST6ULO-TB390-FBS XX-8ULO-TB391-ZB8
ST6-TWINULO-TB392-D-ST6-TWIN
ST10ULO-TB392-D-ST10ULO-TB390-FBS XX-10ULO-TB391-ZB10
Common accessoryReference
Marker cardsULO-TB394-B1, ULO-TB394-B2, ULO-TB394-B3
End clampsULO-TB393-E/UK, ULO-TB393-E/UK1, ULO-TB393-E-WA
DIN railNS35/7.5

Drawing tolerances

Use individually marked dimensions and tolerances where given. General dimensional tolerances are listed below in millimeters.

Dimension rangePitch toleranceNominal dimension tolerance
0-30mm±0.18mm±0.20mm
>30-53mm±0.20mm±0.25mm
>53-70mm±0.25mm±0.30mm
>70-90mm±0.30mm±0.35mm
>90-115mm±0.35mm±0.44mm
>115-150mm±0.44mm±0.55mm
>150-200mm±0.55mm±0.70mm
>200-250mm±0.70mm±0.80mm
>250-320mm±0.75mm±0.90mm
Geometric toleranceApplicable sizeLimit
Perpendicularity≤10mm0.2mm
>10mm0.3mm
SymmetryGeneral0.3mm
Straightness≤100mm0.2mm
Parallelism100-150mm0.3mm
>150mm0.5mm

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