Stackable Test Plug 4mm – Black, Screw Termination [2524]

The 4mm Stackable Test Plug is a high‑quality electrical connector designed for safe, reliable, and flexible connections in educational, laboratory, and electronic testing environments. Finished in black insulation, this plug is ideal for use with standard 4mm test leads, power supplies, and circuit demonstration equipment.

Featuring a 4mm plug with an integrated 4mm rear socket, this connector allows in‑line stacking of multiple connections, making it especially useful for complex circuit setups. The lead wire is securely held in place using a screw termination, ensuring a firm and dependable electrical connection without the need for soldering.

Designed for demanding applications, the plug offers a 1000V AC voltage rating and a 30A current rating. The internal brass contact with nickel plating provides excellent conductivity and durability, while the high insulation resistance supports safe classroom and laboratory use.

Key Features

• 4mm stackable test plug with rear 4mm socket
• Screw termination for secure cable clamping
• Colour: Black
• 1000V AC voltage rating
• 30A current rating
• Brass contact with nickel plating
• High insulation resistance: 100 MΩ
• Allows in‑line stacking of test connections
• Durable, reusable design for frequent use

Ideal for School Science Lessons & Electronics Labs

Ideal for KS3, GCSE, and A‑Level Physics, this 4mm stackable test plug supports a wide range of electrical and electronics experiments. It is particularly useful for:

• Building series and parallel circuits
• Connecting to power supplies, meters, and breadboards
• Demonstrating current, voltage, and resistance
• Rapid reconfiguration of circuit setups using stackable leads
• Teaching safe and professional laboratory wiring practices

Robust, flexible, and classroom‑ready, the 4mm Stackable Test Plug with Screw Termination is an essential component for electrical practical work, supporting safe, clear, and repeatable circuit construction in educational and training environments.