Introduction to ST Terminal Block Series

VIOX ST series rail-mounted terminal blocks represent the pinnacle of connection technology in the low-voltage electrical industry. Engineered with innovative spring-cage clamping technology, these terminal blocks deliver exceptional performance in a compact design that prioritizes both space efficiency and superior wire connection reliability.

The ST terminal block series has been meticulously designed to meet the demanding requirements of modern electrical installations across diverse applications, from industrial automation to building infrastructure. Each ST terminal block adheres to international standards including IEC/EN60947 and UL1059, ensuring global compliance and compatibility with various electrical systems worldwide.

Advanced Spring-Cage Technology and Key Benefits

The core technology behind VIOX ST terminal blocks is the spring-cage clamping mechanism, which offers significant advantages over traditional screw-type connections:

Vibration-Resistant Connections: The spring-cage design maintains constant pressure on conductors, making these terminal blocks ideal for applications subject to vibration or mechanical stress.
Maintenance-Free Operation: Once installed, ST terminal blocks require virtually no maintenance, eliminating the need for periodic re-tightening that screw terminals often demand.
Faster Installation: The tool-actuated spring-cage mechanism allows for quick wire insertion and release, significantly reducing installation time compared to conventional terminal blocks.
Consistent Connection Quality: The precisely calibrated spring pressure ensures optimal contact force regardless of operator skill, eliminating variability in connection quality.
Space-Saving Design: The compact form factor maximizes space utilization in control cabinets and electrical panels.

Applications and Industries

VIOX ST terminal blocks excel in a wide range of applications across multiple industries:

Industrial Automation: Perfect for control panels and machinery where reliable connections are critical
Railway Systems: Vibration-resistant design ensures signal integrity in railway applications
Building Management: Ideal for HVAC, lighting control, and building automation systems
Marine and Shipbuilding: Corrosion-resistant materials suitable for marine environments
Renewable Energy: Reliable performance in solar inverters and wind power control systems
Heavy Equipment: Maintains connection integrity even in high-vibration environments

Technical Features and Specifications

The ST terminal block series incorporates numerous technical innovations:

Pull-Back Connection Technology: All models feature the pull-back connection method, where inserting a screwdriver automatically opens the spring clamp for easy wire insertion
Standardized Mounting: Compatible with all standard 35mm DIN rails for simple installation
High-Grade Materials: Constructed from flame-retardant, self-extinguishing thermoplastic with excellent electrical insulation properties
Comprehensive Marking System: Multiple marking options for clear circuit identification
Touch-Safe Design: Fully insulated construction prevents accidental contact with live parts
Wide Temperature Range: Operational stability from -40°C to +105°C
Voltage Ratings: Models available for applications from 500V up to 1000V
Current Ratings: Solutions ranging from 17.5A to 76A to meet various load requirements

Complete ST Terminal Block Model Range

VIOX offers a comprehensive range of ST terminal block models to accommodate diverse application requirements. The table below provides detailed specifications of our complete product lineup:

Model	Length (mm)	Height (mm)	Thickness (mm)	Terminal Current	Terminal Voltage	Connection Mode	Number of Holes	Wire Cross-section	Strip Length
ST1.5	49.2mm	35.7mm	4.2mm	17.5A	500V	pull-back	1 in/1 in out	0.08mm²-1.5mm²	8mm-10mm
ST2.5	49.2mm	35.7mm	5.2mm	24A	800V	pull-back	1 in/1 in out	0.08mm²-2.5mm²	8mm-10mm
ST4	56.2mm	35.7mm	6.2mm	32A	800V	pull-back	2 in hole	0.08mm²-4mm²	8mm-10mm
ST2.5/3	60.4mm	35.7mm	5.2mm	24A	800V	pull-back	1 in/1 in out	0.08mm²-4mm²	8mm-10mm
ST4/3	72.2mm	35.7mm	6.2mm	32A	800V	pull-back	2 in hole	0.08mm²-6mm²	8mm-10mm
ST2.5/4	73mm	35.7mm	5.2mm	24A	800V	pull-back	1 in/1 in out	0.08mm²-4mm²	8mm-10mm
ST6	70.7mm	42.8mm	8.1mm	41A	1000V	pull-back	2 in hole	0.2mm²-6mm²	12mm
ST10	71.2mm	49.6mm	10.2mm	57A	1000V	pull-back	2 in hole	0.2mm²-10mm²	16mm
ST16	80.5mm	50.8mm	12.2mm	76A	1000V	pull-back	2 in hole	0.2mm²-25mm²	16mm
ST4/4	83mm	35.7mm	6.2mm	32A	800V	pull-back	2 in hole	0.08mm²-6mm²	8mm-10mm
ST6/3	90.5mm	42.8mm	8.1mm	41A	1000V	pull-back	2 in hole	0.2mm²-10mm²	12mm
ST10/3	95.3mm	49.6mm	10.2mm	57A	1000V	pull-back	2 in hole	0.2mm²-16mm²	16mm
STTB1.5	49mm	46mm	4.2mm	17.5A	500V	pull-back	double layer	0.08mm²-1.5mm²	10mm
STTB2.5	49mm	46mm	5.2mm	22A	500V	pull-back	double layer	0.08mm²-4mm²	8mm-10mm
STTB4	49mm	45.8mm	6.2mm	30A	500V	pull-back	double layer	0.08mm²-6mm²	8mm-10mm
ST1.5-PE	49.2mm	35.7mm	4.2mm	/	/	pull-back	1 in/1 in out	0.08mm²-1.5mm²	10mm
ST2.5-PE	49.2mm	35.7mm	5.2mm	/	/	pull-back	2 in hole	0.08mm²-4mm²	8mm-10mm
ST4-PE	56.2mm	35.7mm	6.2mm	/	/	pull-back	2 in hole	0.08mm²-6mm²	8mm-10mm
ST4-HESI	52mm	64mm	6.1mm	0.5-10A	500V	pull-back	2 in hole	0.08mm²-6mm²	8mm-10mm
ST2.5-3L	104mm	52mm	5.3mm	20A	500V	pull-back	3-layer	0.08mm²-4mm²	8mm-10mm
ST2.5-3LPV	104mm	52mm	5.3mm	20A	500V	pull-back	3-layer	0.08mm²-4mm²	8mm-10mm
ST6-PE	70.7mm	42.8mm	8.2mm	/	/	pull-back	2 in hole	0.2mm²-10mm²	12mm
ST10-PE	71.2mm	49.6mm	10.2mm	/	/	pull-back	2 in hole	0.2mm²-16mm²	16mm
ST16-PE	80.5mm	50.8mm	12.2mm	/	/	pull-back	2 in hole	0.2mm²-16mm²	16mm
ST2.5/3-PE	60.4mm	35.7mm	5.2mm	/	/	pull-back	1 in/1 in out	0.08mm²-4mm²	8mm-10mm
ST2.5/4-PE	73mm	35.7mm	5.2mm	/	/	pull-back	2 in/2 in out	0.08mm²-4mm²	8mm-10mm
ST4/3-PE	72.2mm	35.7mm	6.2mm	/	/	pull-back	2 in hole	0.08mm²-6mm²	8mm-10mm
STTB1.5-PE	49mm	46mm	4.2mm	/	/	pull-back	double layer	0.08mm²-1.5mm²	10mm
STTB2.5-PE	49mm	46mm	5.2mm	/	/	pull-back	double layer	0.08mm²-4mm²	8mm-10mm
STTB4-PE	49mm	45.8mm	6.2mm	/	/	pull-back	double layer	0.08mm²-6mm²	8mm-10mm
ST4/4-PE	83mm	35.7mm	6.2mm	/	/	pull-back	2 in/1 in out	0.08mm²-6mm²	8mm-10mm
ST6/3-PE	90.5mm	42.8mm	8.1mm	/	/	pull-back	2 in hole	0.2mm²-10mm²	12mm
ST10/3-PE	95.3mm	49.6mm	10.2mm	/	/	pull-back	2 in hole	0.2mm²-16mm²	16mm
ST2.5-3LPE	104mm	52mm	5.2mm	/	/	pull-back	three layer	0.14-2.5mm²	8mm-10mm

Specialized Variants for Advanced Applications

Beyond our standard offering, VIOX provides specialized ST terminal block variants to address specific application requirements:

ST-PE Series: Ground terminal blocks with distinctive yellow-green coloring for easy identification
STTB Series: Double-layer terminal blocks for increased connection density in space-constrained applications
ST-3L Series: Three-layer designs for maximum connection density
ST-HESI Series: High-current isolation terminal blocks for demanding power applications

Customization and Accessories

VIOX understands that modern electrical systems often require customized solutions. Our ST terminal block system includes a comprehensive range of accessories:

End Plates: Ensure proper insulation at the end of terminal block arrangements
Jumper Bars: Allow for quick and reliable connection between multiple terminals
Marking Systems: Various labeling options for clear circuit identification
Mounting Accessories: Additional components for secure installation
End Brackets: Prevent terminal block movement on the DIN rail

Quality Assurance and Compliance

Every VIOX ST terminal block undergoes rigorous testing to ensure exceptional performance and reliability. Our manufacturing processes adhere to ISO 9001 quality management standards, and our products comply with international safety regulations including:

IEC/EN 60947-7-1 for standard terminal blocks
IEC/EN 60947-7-2 for protective conductor terminal blocks
UL 1059 for terminal blocks for use in electric equipment
CSA C22.2 for Canadian safety standards

Why Choose VIOX ST Terminal Blocks?

Selecting VIOX ST terminal blocks for your electrical installation projects offers numerous advantages:

Proven Reliability: Field-tested performance in demanding applications worldwide
Comprehensive Solution: A complete system approach with compatible accessories
Technical Support: Access to VIOX’s expert engineering team for application guidance
Global Compliance: International certifications ensure acceptance in markets worldwide
Cost Efficiency: Reduced installation time and maintenance-free operation lower total cost of ownership

For detailed specifications, installation guidelines, or custom configurations, contact VIOX ELECTRIC’s technical support team or visit our comprehensive online resources at viox.com.

Wiring & Connection

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