ZHEJIANG SIPUN ELECTRIC CO., LTD. – ST3-4/2X2 Quattro Spring Clamp Terminal Block with Equipotential Bonding

1. Product Overview

ZHEJIANG SIPUN ELECTRIC CO., LTD. presents the ST3-4/2X2, a high-performance Quattro (four-point) spring clamp terminal block engineered for sophisticated circuit distribution in space-constrained industrial panels. This advanced terminal block features a compact two-in, two-out configuration across two levels and incorporates a dedicated integrated equipotential bonding function. Designed to meet rigorous global safety and performance standards, it provides an optimal solution for applications demanding high-density wiring, reliable circuit management, and enhanced electrical safety.

2. Technical Specifications

The table below details the core technical parameters of the ST3-4/2X2 terminal block:

3. Applications and Usage

The ST3-4/2X2 is designed for complex control systems where space, organization, and safety are critical.

• High-Density Panel Wiring: Its Quattro design houses four independent connections in a minimal footprint, effectively doubling or tripling wiring density compared to single-level terminals, ideal for compact PLC cabinets, motor control centers, and distribution boards.
• Complex Circuit Routing & Potential Distribution: Perfect for managing and distributing multiple circuits. It can be used for:
  • Branching Two Independent Circuits: Distributing two separate input signals or power sources to two output devices each.
  • Creating Common Potential Points: Using the integrated bonding and jumpers to establish reliable common voltage or ground points for multiple devices.
• Safety-Critical and Hazardous Areas: The inclusion of equipotential bonding and compliance with international explosion-protection standards (like IECEx for relevant variants) makes it suitable for applications where personnel safety and prevention of ignition risks are paramount.

4. Key Features and Advantages

4.1. Integrated Equipotential Bonding for Ultimate Safety
This built-in feature provides a dedicated, low-resistance path to connect exposed conductive parts, ensuring they remain at the same electrical potential.

• Enhanced Personnel Safety: Drastically reduces the risk of electric shock by preventing dangerous touch voltages during insulation faults.
• Equipment and System Protection: Minimizes damaging circulating currents and potential differences between sensitive equipment, safeguarding functionality and longevity.
• EMC Performance Improvement: A solid bonding network reduces electromagnetic interference, promoting cleaner signal transmission in control circuits.

4.2. Superior Spring-Clamp Connection Technology

• Simple, One-Handed Wiring: The pull-back spring mechanism allows for quick, tool-free (or minimal tool) insertion of prepared conductors, significantly accelerating installation time.
• Unrestricted Use with Ferrules: When used with ferruled wires, there is no limitation on the number of fine strands, ensuring a perfect, reliable connection every time.
• Exceptional Vibration Resistance: The constant force of the spring clamp ensures a maintenance-free, gas-tight connection that remains secure in high-vibration environments like transportation or heavy machinery.
• Compact 3-Wire Connection Capability: The design efficiently accommodates multiple conductors in a single point when required for specific wiring schemes.

4.3. Compact and Versatile Quattro Design

• Maximum Space Optimization: The two-level architecture delivers four connection points in the space of one standard terminal, maximizing the use of valuable panel real estate.
• Clear and Organized Wiring: Groups related circuit paths together logically within one unified block, simplifying diagram tracing, troubleshooting, and future modifications.

5. Complete System Compatibility

The ST3-4/2X2 is part of a modular system and is fully compatible with a wide range of accessories from ZHEJIANG SIPUN ELECTRIC CO., LTD. for a complete wiring solution:

• End Cover / Barrier: Cover ST3-4/2X2G provides physical finger protection and helps meet IP20 ingress protection requirements.
• Bridging Components: Fork type Jumper FBS 10-6 enables the creation of continuous potential groups across adjacent terminal blocks horizontally.
• Identification: Marker ZB6 allows for clear, permanent, and professional circuit identification directly on the terminal block.

6. Quality Assurance and Certifications

Manufactured by ZHEJIANG SIPUN ELECTRIC CO., LTD. under a stringent quality management system, the ST3-4/2X2 terminal block is engineered for reliability. It complies with key international and national standards, including IEC, GB, and CCC, with variants certified for use in explosive atmospheres (IECEx). This comprehensive certification ensures guaranteed performance and safety for global industrial applications.