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Knife Switch Double Pole
Knife Switch Double Pole (Product Code: SLE/PHY/76) is a double-pole, double-throw (DPDT) knife switch on a plastic base, used to open, close and change over circuits in school electricity experiments. Its poles and blades are made of brass for good electrical connections, and the lever position shows students at a glance whether a circuit is made or broken. It is supplied by Jain Scientific Equipments Pvt Ltd (ScienceLab), Ambala, India.
Key Details
| Parameter | Detail |
|---|---|
| Switch type | Knife switch, double pole, double throw (DPDT) |
| Base | Plastic |
| Poles and blades | Brass, for good electrical connections |
| Application | Electricity circuits in school and college labs |
| Current / voltage rating | Not stated in the listing — ask us before specialised use |
| Product code | SLE/PHY/76 |
| Supplied by | Jain Scientific Equipments Pvt Ltd (ScienceLab), Ambala, India |
What Is the Double Pole Knife Switch Used For?
A DPDT switch moves two separate contacts with one lever, so it can switch two circuits together or change a single load between two supplies. Its classic school use is as a reversing switch: with the outer terminals cross-connected, throwing the blades one way or the other reverses the current through a motor, coil or galvanometer. That makes it a handy part of any AC DC circuits experiment kit on the physics bench.
Teachers also like knife switches because the open blade is visible from the back of the room, unlike a sealed switch. Use it with cells or low-voltage supplies only, since the brass parts are exposed; close the blades firmly into their clips, and keep the brass clean so contact stays good.
What to Specify When Ordering
- Quantity of double-pole switches needed
- Whether you also need single-pole knife switches for simpler circuits
- Any current or voltage requirement, so we can confirm suitability
Supplier
Jain Scientific Equipments Private Limited, known by its trading name ScienceLab, supplies this double-pole knife switch as part of its range of switches, keys and circuit accessories for school laboratories. Buyers in India and international markets can combine it with other electricity items in one enquiry. Read more about the company on its profile page.
Related Physics Lab Equipment
Other switching and connection items for the same circuits:
- Knife Switch – Single Pole, Single Throw — for simple on/off control
- Knife Switch, Double Pole — another double-pole listing to compare
- Contact Key (Push Switch) — momentary switching for brief readings
- Demonstration Motor AC/DC — a motor whose direction a reversing switch can change
- Crocodile Clips & Leads — to wire the switch into a circuit
More items are in Physics Lab Equipment.
Frequently Asked Questions
What does double pole, double throw mean on this knife switch?
On the Knife Switch Double Pole, double pole means two separate circuits are switched by one lever, and double throw means each pole can connect to either of two contacts. Together they let the switch change over or reverse a circuit.
What is the Knife Switch Double Pole made of?
The Knife Switch Double Pole has poles and blades made of brass, chosen to ensure good electrical connections, mounted on a plastic base. Keeping the brass surfaces clean and dry helps the blades seat firmly in their clips each time.
What current and voltage can the knife switch handle?
The listing does not state a current or voltage rating for the Knife Switch Double Pole. It is intended for school electricity circuits run from cells or low-voltage supplies; contact us if you need a rating confirmed for a particular circuit.
How do I wire the Knife Switch Double Pole as a reversing switch?
To use the Knife Switch Double Pole as a reversing switch, connect the supply to the two centre terminals, cross-connect the two pairs of outer terminals, and take the load from one outer pair. Throwing the lever either way then reverses the current.
Who supplies the Knife Switch Double Pole?
The Knife Switch Double Pole is supplied by Jain Scientific Equipments Pvt Ltd (ScienceLab), Ambala, Haryana, India, to schools, colleges and dealers in India and international markets, together with keys, leads and other circuit accessories.
Can the Knife Switch Double Pole be ordered in class sets?
Yes, the Knife Switch Double Pole can be ordered in class quantities. Send the number of switches, any single-pole switches or leads you need, and your delivery location through the enquiry cart or contact page for a quotation.
Request a Quote
Request a price for the Knife Switch Double Pole on the contact page, or add it to the enquiry cart with the rest of your circuit items.
Last updated: 24 September 2026
