Knife Switch, Double Pole Manufacturer,Supplier and Exporter in India

Knife Switch, Double Pole (Product Code: SLE/PHY/198) is a double-pole, double-throw (DPDT) knife switch used to reverse the direction of a current or to change a circuit over between two paths in physics and electrical practicals. Its brass poles and blades sit on a plastic base and are chosen to ensure good electrical connections on both poles at once. It is supplied by Jain Scientific Equipments Pvt Ltd (ScienceLab), Ambala, India.

Key Details

What Is the Double Pole Knife Switch Used For?

With its outer terminals cross-connected, the switch becomes a reversing key: one throw sends current through a solenoid, motor or galvanometer in one direction, and the other throw reverses it. That is exactly what is needed to show a magnetic field changing direction, to run a small DC motor backwards, or to average tangent galvanometer readings taken with the current both ways. Wired without the cross-connection, it moves one supply between two circuits, for example charging a capacitor and then discharging it through a meter.

Check that both blades seat fully in their contacts on each throw, since a half-closed pole gives erratic readings. Keep the brass faces clean and limit use to low-voltage circuits, because the conductors are exposed. It is a practical addition to any set of AC DC circuits experiment kits in a school or college laboratory.

What to Specify When Ordering

• Double pole, double throw (this item) or the single-pole version from the same range
• The quantity required for student benches and the demonstration table
• Connecting wire or other circuit components you want included in the same quotation

Supplier

This double pole knife switch is supplied by Jain Scientific Equipments Private Limited, the company behind the ScienceLab name, from Ambala, Haryana, India. Laboratories, training institutes, dealers and importers can source it on one order with the motors, capacitors, power supplies and wiring used in reversing and changeover circuits.

Need more switches to match an earlier delivery, or a mix of single-pole and double-pole switches? Mention it in your enquiry and we will include it in the offer. Company background is on the ScienceLab company profile.

Related Physics Lab Equipment

These items are used with a double pole switch in reversing and changeover circuits:

• Knife Switch – Single Pole — for circuits that only need on/off control
• Capacitor (Charging and Discharging) — a changeover switch moves it between charge and discharge
• Electric Motor — shows reversal of rotation when the current is reversed
• Power Supply, Stepped — a low-voltage DC source for the reversing circuit
• Connecting Wire — for the cross-connection and circuit wiring

Explore the wider range of Physics Lab Equipment.

Frequently Asked Questions

What does DPDT mean on the Knife Switch, Double Pole?
On the Knife Switch, Double Pole, DPDT means double pole, double throw: two separate circuit paths are switched together, and each can be connected to either of two positions. One movement can therefore reverse a current or swap between two circuits.

How do I wire the double pole knife switch as a reversing switch?
To use the Knife Switch, Double Pole as a reversing switch, connect the supply to the common (hinge) terminals, the load to one pair of outer terminals, and cross-connect the outer terminals diagonally. Throwing the blades the other way then reverses the current through the load.

What is the Knife Switch, Double Pole made of?
The Knife Switch, Double Pole has brass poles and blades to ensure good electrical connections, mounted on a plastic base. Wipe the contacts clean if they tarnish, and keep the switch for low-voltage laboratory circuits because the brass parts are exposed.

Which experiments need a double pole knife switch?
The Knife Switch, Double Pole is useful whenever a current must be reversed or a supply moved between circuits: reversing a solenoid or motor, taking tangent galvanometer readings in both directions, switching a capacitor between charge and discharge, or comparing two cells.

Who supplies the Knife Switch, Double Pole?
Jain Scientific Equipments Pvt Ltd (ScienceLab) of Ambala, Haryana, India supplies the Knife Switch, Double Pole to schools, colleges, laboratory dealers and importers. Orders can combine the switch with the single-pole version and the other electricity apparatus used in the same experiments.

Can double pole knife switches be supplied in bulk?
Yes. The Knife Switch, Double Pole can be quoted for a single school or in larger quantities for colleges, dealers and importers in India and international markets. State the quantity and destination in your enquiry, and add any single-pole switches you also need.

Request a Quote

To receive a quotation for the Knife Switch, Double Pole, send the quantity and delivery location through our contact page, or place the switch in the enquiry cart together with other electricity apparatus for a single combined offer from ScienceLab.

Last updated: 24 September 2026