Stackable Test Plug 4mm – Red, Screw Termination [2525]

The 4mm Stackable Test Plug in red is a high‑performance electrical connector designed for safe, flexible, and professional circuit connections in educational, laboratory, and electronics testing environments. Its bright red insulation makes it ideal for colour‑coded circuits, particularly for identifying live or positive connections.

This connector features a standard 4mm plug with a 4mm socket in the rear, allowing in‑line stacking of multiple test leads. The cable is held securely using a screw termination, providing a strong, reliable electrical connection without the need for soldering—perfect for classroom and workshop use.

Built for demanding applications, the plug is rated to 1000V AC with a 30A current capacity. High‑quality brass contacts with nickel plating ensure excellent conductivity and long‑term durability, while the high insulation resistance supports safe use in teaching laboratories.

Key Features

• 4mm stackable test plug with rear 4mm socket
• Screw termination for secure cable clamping
• Colour: Red (ideal for positive/live connections)
• 1000V AC voltage rating
• 30A current rating
• Brass contact with durable nickel plating
• High insulation resistance: 100 MΩ
• Supports in‑line stacking for flexible circuit layouts
• Reusable and robust for frequent educational use

Ideal for School Science Lessons & Electronics Labs

Ideal for KS3, GCSE, and A‑Level Physics, this red stackable test plug supports safe and efficient construction of electrical circuits. It is particularly useful for:

• Colour‑coded series and parallel circuits
• Connecting to power supplies, meters, and data loggers
• Demonstrating voltage, current, and resistance
• Rapid re‑configuration of circuits using stackable connections
• Teaching correct and safe laboratory wiring practices

Reliable, durable, and classroom‑ready, the 4mm Red Stackable Test Plug with Screw Termination is an essential component for practical electronics and physics teaching, supporting clear, safe, and repeatable experimental work.