When it comes to electrical safety, performance, and reliability in control panels and automation systems, the Sprecher + Schuh VU 4-2.5 Through Terminal Block stands out as a proven performer. Designed for industrial-grade applications, this 2.5mm feed-through terminal block offers exceptional voltage and current handling, a robust screw-clamp connection technology, and global compliance certifications.
In this comprehensive guide, we’ll explore its technical specifications, applications, compliance standards, and modern alternatives, showing why the Sprecher + Schuh VU 4-2.5 continues to be a trusted choice for professionals worldwide.
What is the Sprecher + Schuh VU 4-2.5 Through Terminal Block?
The Sprecher + Schuh VU 4-2.5 Through Terminal Block is a DIN rail-mountable terminal designed for secure electrical connections in industrial and commercial wiring. Supporting conductors up to 2.5mm² (AWG 14), it allows safe and efficient feed-through wiring, ensuring continuity across circuits while keeping control panels organized and accessible.
Its screw-clamp connection technology ensures a tight, vibration-resistant connection, while the white or gray polyamide housing helps with color-coded identification in control systems. This design reduces wiring errors and supports maintenance efficiency.
Key Highlights:
● Rated 750VAC (IEC) and 900VDC, or 600VAC (UL/CSA).
● Supports 20–24A current depending on standards.
● Accepts AWG 24–12 wire range.
● Polyamide 6.6 flame-retardant housing (UL 94 V-0).
● Mounts on 35mm DIN rail (EN 60715 standard).
● Available in multiple colors for easy circuit identification.
These qualities make the VU 4-2.5 ideal for both new installations and retrofits in control panels, lighting systems, and automation setups.
Technical Specifications of the Sprecher + Schuh VU 4-2.5 Through Terminal Block
The Sprecher + Schuh VU 4-2.5 terminal block is engineered with precision to meet demanding industrial standards. Here’s a deep dive into its core specifications:
Electrical Ratings
● Voltage Rating: 750VAC (IEC) / 900VDC
● North American Rating: 600VAC (UL/CSA)
● Current Rating: 20–24A depending on application
● Overvoltage Category: III (industrial power distribution)
Wire Capacity
● Accepts AWG 24 to AWG 12 (0.2mm² to 4mm²)
● Ideal for both solid and stranded wires
● Ensures gas-tight, corrosion-resistant connections
Connection Method
● Screw clamp system with nickel-plated copper bar
● Torque: approximately 0.5–0.6 Nm
● Vibration-resistant and re-tightenable for maintenance
Insulation and Material
● Made of Polyamide 6.6 (Nylon)
● Flame-retardant: UL 94 V-0 / V-2
● Temperature range: -40°C to +90°C continuous
● Halogen-free and RoHS-compliant
Mounting and Dimensions
● Mounting: Snap-on 35mm DIN rail
● Width: ~5mm per pole | Height: ~45mm | Depth: ~40mm
● Lightweight (~0.02 kg each)
Color and Identification
● Standard Colors: Gray, White, Blue, Yellow, Red
● White version: typically denotes neutral/common conductors
● Marking surface for ID labels or tags
Accessories
● End plates for safety termination
● End stops for DIN rail retention
● Partition plates for isolation
● Jumper bars (e.g., VUTS 4-10) for bridging adjacent terminals
This modular approach ensures flexibility for panel builders who need scalable, organized wiring systems.
Applications of the Sprecher + Schuh VU 4-2.5 Terminal Block
The VU 4-2.5 terminal block is widely used across industries for connecting, organizing, and protecting circuits. Its high voltage and temperature ratings make it suitable for both control and power applications.
1. Control Panels and Automation Systems
Engineers use VU 4-2.5 terminal blocks to interconnect PLCs, relays, contactors, and sensors within control panels. It allows field wiring from I/O modules to be terminated neatly, making maintenance and testing simpler.
2. Power Distribution and Lighting Circuits
With its 20A capability, this terminal block can distribute power across lighting, HVAC, or building automation systems. The white variant is often used for neutral conductors, promoting consistent color coding.
3. Machinery and HVAC Equipment
Used in packaging machines, conveyors, and HVAC systems, the VU 4-2.5 ensures reliable operation under vibration and temperature stress. Its materials withstand up to 90°C, making it ideal for warm, enclosed spaces.
4. Renewable Energy and DC Circuits
The 900V DC rating allows this terminal to function in solar PV combiner boxes or battery systems. When paired with ferrules, it supports fine-stranded wires common in DC applications.
5. Hazardous Environments
Thanks to ATEX and IECEx Ex e certifications, the VU 4-2.5 can be safely used in petrochemical, mining, or oil & gas facilities, provided it’s enclosed properly.
In every setting, it enhances safety by preventing loose connections and ensuring easy isolation during maintenance.
Certifications and Compliance
The Sprecher + Schuh VU 4-2.5 terminal block adheres to international standards, ensuring safety, quality, and compatibility across global markets.
North American Certifications
● UL Recognized (UL 1059) – Industrial terminal block certification
● CSA Certified – Complies with Canadian electrical safety standards
● 600V Rating – Suitable for UL-listed panels
International Approvals
● Complies with IEC 60947-7-1 terminal block standard – Low-voltage terminal block standard
● KEMA-KEUR, SEMKO, N, CE Marks – Indicates conformity with European and global regulations
Hazardous Location Ratings
● Certified for Ex e I/II (Increased Safety) environments
● Approved for Zone 1 and Zone 2 hazardous areas
● Tested by LCIE (France) for ATEX compliance
Environmental Compliance
● RoHS-compliant (lead-free and halogen-free)
● UL94 V-2/V-0 flame rating
● Temperature resistance from -50°C to +120°C
These certifications confirm that the VU 4-2.5 is built for durability and safety under industrial demands.
Alternatives and Modern Equivalents
Although the VU 4-2.5 has been discontinued, Sprecher + Schuh continues its legacy through the V7-W series.
V7-W3: Modern Equivalent
● Voltage rating: 600VAC (UL), 800VAC (IEC)
● Wire capacity: 2.5mm², same as VU 4-2.5
● Improved design: Enhanced DIN rail clip and marker system
● Cross-reference: VU 4-2.5 White ≈ V7-W3-WH
The V7-W series ensures full backward compatibility, allowing mixed use in existing installations.
Comparable Models from Other Brands
● Phoenix Contact UK 2.5 N / UT 2.5: 800V, 24A, identical size and connection type.
● Weidmüller WDU 2.5: 800V, 24A with color options.
● Allen-Bradley 1492-J3: 600V, 20A, compatible geometry.
Each serves the same core purpose: reliable, modular wire connection for industrial and automation systems. However, Sprecher + Schuh’s robust screw clamp design gives it an edge in contact force and durability.
Screw vs. Spring Clamp
Screw terminals, such as the VU 4-2.5, offer higher torque and long-term strength, making them ideal for applications requiring periodic re-tightening. In contrast, spring-clamp terminals provide faster installation and maintenance-free pressure, better suited for vibration-prone setups.
Both options remain viable, but for engineers prioritizing proven longevity and strong contact integrity, the VU 4-2.5’s screw-clamp mechanism remains a benchmark.
Why Choose the Sprecher + Schuh VU 4-2.5 Terminal Block?
Choosing the right terminal block can make a significant difference in system reliability, maintenance, and compliance. The VU 4-2.5 offers:
● Proven Reliability: Decades of use across industries
● High Safety Standards: UL, CSA, IEC, ATEX approvals
● Modular Flexibility: Accessory compatibility for scalable wiring
● Ease of Identification: Multiple color variants and label support
● Global Availability: Supported by Sprecher + Schuh’s modern V7 series
For industrial electricians, engineers, and panel builders, this terminal block ensures long-term stability and easy integration.
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Conclusion: Built to Last, Designed for Precision
The Sprecher + Schuh VU 4-2.5 Through Terminal Block continues to prove that well-engineered electrical components can stand the test of time. Its high current capacity, exceptional insulation, and global certifications make it a top choice for professionals who value precision and safety in every connection.
For modern applications, its successor—the V7-W3—delivers the same reliability with updated features. Whether you’re upgrading old panels or designing new systems, Sprecher + Schuh’s commitment to quality ensures your connections are built to last.
Looking to explore Sprecher + Schuh terminal blocks or the latest V7-W series? Visit the Industrial Electrical Warehouse product page to learn more about specifications, compatibility, and ordering options.
