Brass One Way Plug Key

Product Code : SCL-EAE-12122

Brass One Way Plug Key (SKU SCL-EAE-12122) is a simple laboratory switch that closes a circuit when its brass plug is inserted and opens it when the plug is pulled out. It gives students a visible, hands-on way to control current in basic electricity and Ohm's law practicals from middle school to college. Science Lab Supplies manufactures the plug key in its own workshop at Plot 448, HSIIDC Industrial Area, Saha, Ambala, India, and delivers it direct to schools, colleges, tender contractors and distributors.

Specifications

The confirmed details of the key are listed in the table below. In short, it is a manually operated one-way brass plug key that makes or breaks a single circuit path. Electrical ratings and dimensions for the batch you order are stated on the quotation, so you can match the key to your circuit kits.

Applications and Experiments for the One Way Plug Key

Placed in series with the supply, the key lets students switch a circuit on only while readings are being taken and show the difference between open and closed circuits clearly. It is a basic item in an electricity and magnetism lab kit for schools and on college physics benches.

• Class 10 and Class 12 physics: verifying Ohm's law with the Ohms Law Apparatus, closing the circuit only while readings are taken.
• Series and parallel circuit work with an Ammeter and Voltmeter.
• Demonstrating open-circuit and closed-circuit conditions and circuit continuity.
• Resistance and other basic electrical investigations in school and college labs.

Switch off the supply before changing connections, avoid touching exposed conductors in a live circuit, and stay within the limits of the connected apparatus.

Standard Scope of Supply

The supply consists of one Brass One Way Plug Key. Connecting wires, a power source, meters and resistance components are not included with the key; any of these that your practical needs can be added as separate items on the same quotation.

Packing, MOQ and Lead Time

Plug keys can be quoted individually or in quantities for every student group in a school physics lab. Each quotation sets out the packing, delivery time and price for the number requested, and the meters, rheostats and resistance boxes that go with them can be listed on it.

Science Lab Supplies holds an Importer-Exporter Code, so it is able to ship to buyers in Nigeria, Kenya, Ghana, Ethiopia, Tanzania and Uganda. Requests are welcome via the contact page or the enquiry cart; for public tenders, see the lab tender page.

Frequently Asked Questions

How does a one-way plug key work?
When the brass plug is pushed into the key, it bridges the contacts and completes the circuit so current can flow. Pulling the plug out breaks continuity and stops the current at once.

Can it be used in an Ohm's law experiment?
Yes. It serves as the circuit-control switch in an Ohm's law setup, used together with a suitable power source, resistance, ammeter and voltmeter, so current flows only while readings are being recorded.

What current and voltage can the key take?
Ratings are confirmed on the quotation for the batch supplied. Share the supply voltage and current of your circuit through the contact page and the quotation will state whether this key suits it.

Is Science Lab Supplies the manufacturer or a trader?
Science Lab Supplies manufactures the key at its Saha, Ambala site in India and sells it without a distributor in between, so pricing and dispatch are handled by the factory that makes it.

Related Keys and Basic Electricity Apparatus

These items are used with or instead of the one-way key in basic electricity practicals: keys that route, pulse or reverse current, plus the resistance boxes, coils and rheostats wired into the same circuits. They come from the Electrical and Electronics and Applied Mechanics ranges and can share a quotation.

• Brass Two Way Plug Key Switch — three-block key that routes current to one of two branches.
• Brass Four Way Plug Key — four brass blocks and two plugs for routing and reversal.
• Tapping Key Physics Lab — spring-return key closing the circuit only while pressed.
• Reversing Key Commutator For Lab — reverses current with a lever, rated 3 A.
• Resistance Box Plug Type (Constantan / Manganin Coil) — plug-type box with wound coils.
• Rheostat, Constantine (Eureka) Wire — sliding-contact variable resistance.
• Resistance Coil 1 Ohm — 1 ohm manganin coil, ±1%, with two 4 mm binding posts.

Browse the full Electrical and Electronics range, the Lab Meters range for ammeters and voltmeters, or all physics lab equipment.

Last updated: 9 October 2026