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Spring Terminal Blocks

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 Enhancing Reliability & Efficiency with Advanced Thermal Management and Electrical Solutions

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Product Overview

Efficient spring terminal blocks, no screw operation, fast wiring, adapt to vibration and temperature difference environment.

  • Hook-blade connection technology: suitable for specific industrial applications, providing a more stable connection effect.
  • Quick and safe installation: after inserting the cable, the spring automatically fixes the conductor without additional operation.
  • Screw-free design: using the spring clamping structure, there is no need to tighten or loosen the screws, simplifying the wiring process.
  • Convenient operation: loosen the spring clamp with a flat screwdriver and easily push the wire into the terminal block.
  • Anti-vibration and temperature difference resistance: The spring clamping structure can resist vibration and temperature changes to ensure long-term stable connection.
  • Adapt to a variety of wire diameters: compatible with cables of different specifications, strong adaptability, and meet diverse needs.

 

 

Key Advantages

  • Tool-Free Installation & Removal
    The spring-clamp system automatically grips conductors inserted into the terminal mouth. Wires can be added or removed by simply pressing the release lever—no screwdriver required.
  • Consistent Contact Pressure
    Stainless-steel spring elements maintain uniform clamping force over time and temperature cycles, preventing loose connections and reducing maintenance frequency.
  • High Vibration & Shock Resistance
    The dynamic spring mechanism absorbs vibration, ensuring contact reliability in machinery, transportation, and high-movement environments.
  • Wide Conductor Range
    JST terminals support 0.2 mm² to 16 mm² conductor cross-sections, handling both fine-stranded signal wires and medium-gauge power conductors.
  • Slim, Modular Design
    Compact housing footprints allow up to 20 % more terminal points per DIN rail compared to traditional screw-clamp blocks, optimizing cabinet real estate.
  • Enhanced Safety & Insulation
    Made from UL94 V-0 flame-retardant PA66, with reinforced barriers between poles, ensuring creepage and clearance distances meet high-voltage requirements up to 800 V AC/DC.
  • Integrated Marking & Bridging
    Each JST terminal features an easy-access marking slot for labels or printed markers, along with lateral and vertical bridge channels for quick circuit parallelization.

Product Catagories

LEIPOLE Spring Terminal Blocks JST4

wdt_ID wdt_created_by wdt_created_at wdt_last_edited_by wdt_last_edited_at Model size rated current Rated voltage solid cross section(min-max) stranded cross section (min-max)
48 Kiva 26/06/2025 08:43 AM Kiva 26/06/2025 08:43 AM JSTTB 2.5 (double layer） T5.2xH47.5xW68 26A 800V 0.2mm² - 4mm² 0.2mm² - 2.5mm²
53 Kiva 26/06/2025 08:44 AM Kiva 26/06/2025 08:45 AM JST 2.5-QU (four lead) T5.2xH36xW73 28A 800V 0.2mm² - 4mm² 0.2mm² -2.5mm²
54 Kiva 26/06/2025 08:49 AM Kiva 26/06/2025 08:49 AM JST1.5 T4.2 H36.5 W48.5 17.5A 500V 0.14mm² - 1.5mm² 0.14mm² -1.5mm²
55 Kiva 26/06/2025 08:50 AM Kiva 26/06/2025 08:50 AM JST 2.5 T5.2 H36.5 W48.5 31A 800V 0.14mm² - 1.5mm² 0.2mm² - 2.5mm²
56 Kiva 26/06/2025 08:50 AM Kiva 26/06/2025 08:50 AM JST 4 T6.2 H36.5 W56 40A 800V 0.2mm² - 6mm² 0.2mm² - 4mm²
57 Kiva 26/06/2025 08:51 AM Kiva 26/06/2025 08:51 AM JST 6 T8.2 H43.5 W69.5 52A 800V 0.5mm² - 10mm² 0.5mm² - 6mm²
58 Kiva 26/06/2025 08:52 AM Kiva 26/06/2025 08:52 AM JST 2.5-TW T5.2 H36 W71 28A* 800V 0.2mm² - 4mm² 0.2mm² - 2.5mm²
59 Kiva 26/06/2025 08:52 AM Kiva 26/06/2025 08:52 AM JST 4-TW T6.2 H36 W78 40A* 800V 0.5mm² - 6mm² 0.5mm² - 4mm²
Model size rated current Rated voltage solid cross section(min-max) stranded cross section (min-max)

Applications

  • Automation & Control Panels: Signal wiring for PLC I/O modules, sensor networks, and small actuators.
  • Machine Tool Distribution: Power feed to servomotors, spindle drives, and heating elements, benefiting from high vibration tolerance.
  • Building Management Systems: Secure termination of HVAC control circuits, lighting control wiring, and fire-alarm loops.
  • Transportation & Railway Equipment: Robust connections in rolling stock, ensuring electrical integrity through shocks and vibrations.
  • Industrial Power Distribution: Branching of 24 V, 48 V, or higher DC bus and AC control voltages in machinery and switchgear.
  • Renewable Energy Inverters: Termination of string inputs and auxiliary DC supplies in solar and wind inverters.

Basic Knowledge

What Is a Spring Terminal Block?A spring terminal block uses a spring steel or stainless-steel hairpin inside the terminal housing to clamp conductors when inserted. This design eliminates the need for manually tightening screws, providing tool-free conductor insertion and removal.Advantages Over Screw Terminal Blocks

  • Faster Wiring: Instant wire insertion without screwdriver saves installation time.
  • Consistent Contact: Spring tension remains uniform over thermal cycles, reducing maintenance.
  • Reduced Risk of Over/Under Tightening: No torque-setting is needed, preventing conductor damage.

DIN Rail Mounting Standards

  • NS 35/7.5 vs. NS 35/15: JST blocks clip onto standard 35 mm rails—either the slimmer 7.5 mm-height version for compact layouts or the 15 mm rail for heavier assemblies.

Understanding Conductor Sizing

  • Always choose a JST model whose maximum wire size meets or exceeds the gauge needed. Undersized blocks can lead to poor contact or overheating; oversized blocks ensure safe, low-impedance connections.

Why Choose Leipole?

As a professional buyer, do you face these challenges?

❌ Delivery delays – affecting project progress and production line stability

❌ Poor technical adaptability – standard products cannot meet complex working conditions

❌ High hidden costs – frequent maintenance, excessive energy consumption, slow after-sales response

❌ Compliance risks – lack of international certification leads to customs clearance and warranty disputes

Leipole is proud to offer one-stop solution:

💎 Global layout, zero delivery delays

  • R&D and sales headquarter led by the team in Singapore – cutting-edge cooling technology iteration to ensure product leadership
  • Manufacturing base in Shanghai, China – ISO 9001 & ISO14001 certified, cost optimization + high quality control standards
  • Localized warehousing in 24 countries – spot shipments from the EU, America, and Southeast Asia, urgent orders arrive within 3 days

🔧 Deep customization capabilities to solve complex needs

  • OEM/ODM full-case support – from cooling structure design to branding customization, 100+ successful cases (Industrial Automation/ New Energy Industry/Data Centers)
  • Working condition simulation test – Free simulation of air volume, high temperature, high humidity and vibration environment to ensure 100% adaptability of the solution

🌍 Worry-free compliance, global access

  • Authoritative certification – CE, UL, RoHS, REACH full coverage, hassel-free customs clearance in Europe, America and Southeast Asia

🚀 Cost optimization throughout the entire life cycle

  • Energy consumption reduced by 30% – patented airflow design, saving 30% in electricity bills per year compared to peer product
  • 1-year warranty – redundant design of key components, failure rate <0.2%
  • 7×24 localized service – 50+ national technical teams, 4-hour response, direct supply of spare parts.

Customization Process

Accurate Demand Analysis

Professional engineers deeply understand your equipment parameters, application environment, and special requirements.

Customized Technical Solutions

R&D teams develop optimal heat dissipation solutions based on your needs, including airflow calculations and installation planning.

 Sample Testing and Validation

Provide samples for real-environment testing, collect data feedback, and ensure solution effectiveness.

Mass Production

After confirming the solution, production follows strict ISO9001 quality management systems to ensure batch stability.

FAQ

Q1: Can I insert stranded wires directly into JST blocks?
Yes. JST terminals securely hold both solid and stranded wires. For stranded wires, using ferrules can improve insertion consistency.Q2: How do I release a wire from a JST spring terminal?
Use a flat-blade screwdriver or the integrated release button to depress the spring element, then pull the conductor out easily.Q3: Are JST spring terminals suitable for high-vibration environments?
Absolutely. The spring mechanism consistently maintains clamping force even under continuous vibration, making them ideal for mobile machinery and rail applications.Q4: What safety standards do JST blocks comply with?
JST Series uses UL94 V-0 flame-retardant PA66 housing and meets IEC/EN 60947-7-1 requirements for terminal blocks. They also conform to RoHS and REACH directives.Q5: Can I stack or bridge multiple JST blocks?
Yes. JST blocks feature standardized lateral and vertical bridge slots, allowing quick installation of jumper bars or busbars for parallel or multi-pole circuit distribution.

Q6: What ambient temperatures are supported?
JST blocks operate safely from –20 °C to +70 °C. Ensure panels remain within this range and provide adequate ventilation for continuous loads.

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