Knife Switch
Product Code : LSK-PL-10311
Knife Switch (SKU LSK-PL-10311) is a single pole, single throw switch with brass poles and blade on a plastic base, used to open and close student circuits so the break in the circuit is clearly visible. It suits school electricity practicals and introductory college labs. Science Lab Supplies makes the switch in its own unit at Plot 448, HSIIDC Industrial Area, Saha, Ambala, India, and the factory sends quotations straight to schools, colleges, tender contractors and distributors.
Specifications
The SPST switch is broken down fact by fact in the table below. In short, a single brass blade closes into brass contacts to give one on/off path; brass is used for the poles and blade to keep the electrical connection good, and the parts are mounted on a plastic base that carries the switch into the circuit.
| Specification | Value |
|---|---|
| SKU | LSK-PL-10311 |
| Type | Single pole, single throw (SPST) |
| Poles | Brass |
| Blade | Brass |
| Reason for brass | Good electrical connections |
| Base | Plastic |
| Range | Part of a range of knife switches on plastic bases |
| Use | Electricity circuits |
| Manufacturer | Science Lab Supplies, Saha, Ambala, Haryana |
| Country of origin | India |
Applications and Experiments for the Knife Switch
A knife switch lets students see exactly when a circuit is open or closed, which makes it a natural teaching switch for first circuits and for measurement practicals where the current should flow only while readings are taken. It fits electricity topics from middle school through Class 12 and college physics labs.
- NCERT Class 6 science (Electricity and Circuits): open and closed circuits, switching one of the Miniature Lamps on Clamp Stands on and off.
- Class 10 physics (Electricity): switching Ohm's law and resistor circuits.
- Class 12 and B.Sc. practicals: a plain on/off switch in potentiometer circuits and on the Meter Bridge or Wheatstone Bridge With Pencil Jockey.
Standard Scope of Supply
The Knife Switch is supplied as a single unit as described above: brass poles and blade assembled on the plastic base, ready to be wired into a circuit. Cells, leads, lamps and other circuit components can be listed on the same quotation so the bench is complete.
Packing, MOQ and Lead Time
You may request a quotation for a few switches or for a full set of circuit benches. Each quotation gives the packing, delivery time and price for the quantity requested, and leads, cell holders or bulb holders can be added so the complete circuit kit arrives together.
Holding an Importer-Exporter Code, Science Lab Supplies as a registered exporter can ship to buyers in Qatar, Sri Lanka, Vietnam, Malaysia, Peru and Egypt. Switch quantities and any matching circuit parts can be sent as a message from the contact page or saved as a list in the enquiry cart; institutional tenders follow the lab tender page.
Frequently Asked Questions
What type of knife switch is this?
It is a single pole, single throw (SPST) knife switch: one blade opens or closes one circuit path. That makes it a simple on/off switch for series circuits and measurement set-ups.
What are the blade and contacts made of?
The poles and blade are brass, chosen to give good electrical connections, and they are mounted on a plastic base. The switch is intended for use in electricity circuits.
Is Science Lab Supplies the manufacturer or a trader?
Brass-bladed knife switches like this one are produced by Science Lab Supplies in its Saha, Ambala factory in India, so the manufacturer itself prepares your quotation and handles the dispatch.
Can knife switches be quoted for a school tender?
Yes. Send the quantity, delivery location and any tender specification, and the quotation will list the switch against that specification together with any other circuit items you need.
Related Switches and Circuit Components
A switch works alongside other keys, a power source, a load and connecting leads. The seven items below cover those jobs on the student bench, from plug, tapping and reversing keys to a cell holder and heavy-duty clip leads, and all of them can go on the same quotation as the knife switches.
- Double-Pole Switch — 24 V, 2 A snap-in panel-mount switch for direction or power state.
- Brass One Way Plug Key — opens or closes a circuit as a conductive plug is inserted or removed.
- Tapping Key Physics Lab — momentary contact switch whose brass spring strip returns to open when released.
- Reversing Key Commutator For Lab — reverses the current direction in a circuit without rewiring.
- Cell Holder — 1.5 to 6 V DC from four D cells, with 4 mm sockets.
- Circuits Kit Bulb Holder — spare bulb holder on a sturdy Circuits Kit panel, to act as the load.
- Alligator Leads Heavy Duty — pack of 10 leads with 10 mm jaw openings.
Browse the full Physics Lab range, the Electrical and Electronics range for plug keys and bridges, or all physics lab equipment.
Last updated: 22 October 2026
