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Knife Switch – Single Pole, Single Throw
Knife Switch – Single Pole, Single Throw (Product Code: SLE/PHY/68) is a knife switch on a plastic base used to open and close a single circuit in electricity practicals, with an exposed blade that shows at a glance whether the circuit is made or broken. Its poles and blade are brass to give good electrical connections, which makes it a dependable control in an Ohm law experiment kit. It is supplied by Jain Scientific Equipments Pvt Ltd (ScienceLab), Ambala, India.
Specifications
| Parameter | Detail |
|---|---|
| Switch type | Knife switch, single pole, single throw (SPST) |
| Base | Plastic |
| Poles and blade | Brass, to ensure good electrical connections |
| Application | Electricity circuits |
| Product code | SLE/PHY/68 |
| Supplied by | Jain Scientific Equipments Pvt Ltd (ScienceLab), Ambala, India |
What Is a Single Pole Knife Switch Used For?
A single-pole, single-throw switch has one job: connect or disconnect one line of a circuit. The knife pattern is popular in teaching because the moving blade is visible, so students see the physical gap that stops the current, which links the circuit symbol for a switch to the real object. It is the usual choice for switching the supply in resistance, Ohm’s law and heating-effect experiments.
Open the switch between readings so resistors and wires do not heat up and change the results. When closing, push the blade fully into the jaw so the brass parts meet firmly; a half-seated blade gives a poor contact and flickering meter readings. Operate the switch by its handle and keep fingers clear of the exposed metal when the circuit is live.
What to Specify When Ordering
- Switch pattern: this is single pole, single throw; double-pole knife switches are listed separately.
- Quantity per lab, typically one per circuit board or student pair.
- Any leads, meters or holders to be quoted with the switches.
Supplier
ScienceLab is the trade name of Jain Scientific Equipments Private Limited, which supplies this knife switch from Ambala, Haryana, India. The single-pole and double-pole knife switches in the range are sourced and quoted by the same company, so a lab can standardise on one style and order replacements from us directly. The ScienceLab profile has more about the company.
Related Physics Lab Equipment
Items used alongside the switch:
- Knife Switch Double Pole — for switching two lines at once.
- Contact Key (Push Switch) — a push-type key for taking brief readings.
- Crocodile Clips & Leads — connect the switch into the circuit.
- MES Bulb Holder — a simple load that shows when the switch is closed.
- Ammeter Voltmeter — takes readings in the switched circuit.
See all items in Physics Lab Equipment.
Frequently Asked Questions
What does single pole, single throw mean on this knife switch?
On the Knife Switch – Single Pole, Single Throw, one blade controls one circuit line and has one closed position, so the switch simply connects or disconnects that line.
What materials is the Knife Switch – Single Pole, Single Throw made of?
The Knife Switch – Single Pole, Single Throw is mounted on a plastic base, and its poles and blade are made of brass to ensure good electrical connections in student circuits.
Why use a knife switch instead of an enclosed switch in class?
The Knife Switch – Single Pole, Single Throw has a visible blade, so students can see the circuit open and close. This helps them connect the switch symbol in diagrams with how switching actually works.
Who supplies the Knife Switch – Single Pole, Single Throw?
Jain Scientific Equipments Pvt Ltd (ScienceLab), Ambala, Haryana, India, supplies the Knife Switch – Single Pole, Single Throw. The company sources the switch and quotes it to schools, colleges, dealers and importers in India and international markets.
Is a current rating given for the Knife Switch – Single Pole, Single Throw?
A current or voltage rating for the Knife Switch – Single Pole, Single Throw is not stated in this listing. Ask us through the contact page to confirm suitability for your circuit.
Can the Knife Switch – Single Pole, Single Throw be ordered in bulk?
Yes. ScienceLab quotes the Knife Switch – Single Pole, Single Throw in lab quantities directly as the supplier for schools, colleges, dealers and importers in India and international markets.
Request a Quote
Send the number of switches you need through the ScienceLab contact page or add the item to the enquiry cart. Quotes come directly from ScienceLab as the supplier.
Last updated: 24 September 2026
