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Reed Relay
Reed Relay (Product Code: SLE/PHY/286) is a single pole changeover switching unit used to charge and discharge a capacitor many times per second in school and college physics laboratories. Driven by a power signal generator, it changes over at 5 to 400 Hz, so students can find capacitance from a steady average current. It is supplied by Jain Scientific Equipments Pvt Ltd (ScienceLab), Ambala, India, for physics lab equipment buyers in India and international markets.
Specifications
| Parameter | Detail |
|---|---|
| Type | Single pole changeover reed relay |
| Switching rate | 5 to 400 changeovers per second when driven by a power signal generator |
| Coil drive | Coil operates at up to 400 Hz |
| Maximum contact rating | 12 V, 10 mA |
| Contact protection | Contact current-protected by a 12 ohm resistor |
| Main application | Repeated charge and discharge of parallel plate capacitors |
| Product code | SLE/PHY/286 |
| Supplied by | Jain Scientific Equipments Pvt Ltd (ScienceLab), Ambala, India |
What Is the Reed Relay Used For?
The reed relay is the switching heart of the classic vibrating-switch method for measuring capacitance. Its changeover contact connects a parallel plate capacitor to a DC supply, then discharges it through a sensitive current meter, once in every cycle of the drive signal. Because the capacitor charges and discharges f times per second, the meter shows a steady average current I = fCV, and students calculate C from their readings.
Changing the frequency on the signal generator, the plate separation or the plate area turns one set-up into a full graph-based investigation, including an estimate of the permittivity of free space. It suits senior secondary and undergraduate electricity practicals. Keep the charging circuit within the 12 V, 10 mA contact rating, start at a low switching rate and raise it gradually while watching for a stable meter reading.
What to Specify When Ordering
- Number of reed relay units, usually one per working group.
- Whether you also need a power signal generator to drive the relay coil.
- Parallel plate capacitor and a sensitive meter for the discharge current.
- Delivery location, so the quotation can include packing and freight.
Supplier
ScienceLab is the trading name of Jain Scientific Equipments Private Limited, a laboratory equipment company based in Ambala, Haryana. The company supplies this reed relay to schools, colleges, training institutes and dealers, and can combine it in one quotation with the signal generator, capacitor plates and meters needed for the same experiment. Read more about us on the company profile page.
Related Physics Lab Equipment
These items complete a capacitance practical built around the Reed Relay:
- Signal Generator and Amplifier — supplies the drive signal that sets the switching frequency.
- Demonstrative Plan Condenser/ Capacitor — parallel plate capacitor for charge and discharge measurements.
- Power Supply Variable — DC source for the charging voltage.
- Standard Digital Multimeter — checks the supply voltage and the average current.
- Simple Circuit Module Reed Relay — module-format reed relay for simple circuit work.
Browse the full Physics Lab Equipment range for more electricity apparatus.
Frequently Asked Questions
What does the Reed Relay do in a capacitance experiment?
The Reed Relay switches a capacitor between charging and discharging many times per second. Driven by a power signal generator at 5 to 400 Hz, it produces a steady average current, from which students calculate capacitance using the relation I = fCV.
What are the contact ratings of the Reed Relay?
The Reed Relay contact is rated at a maximum of 12 V and 10 mA, and it is current-protected by a 12 ohm resistor. Keeping the charging circuit within these limits protects the reed contact and keeps readings consistent.
What do I need to operate the Reed Relay?
The Reed Relay coil is driven by a power signal generator at up to 400 Hz. To complete the circuit you also need a DC supply for charging, a parallel plate capacitor and a sensitive current meter, all of which ScienceLab can quote together.
Who supplies the Reed Relay?
The Reed Relay is supplied by Jain Scientific Equipments Pvt Ltd, which trades as ScienceLab from Ambala, Haryana, India. It is offered to schools, colleges, institutions and dealers in India and international markets, alongside the matching signal generator and capacitor.
Can a calibration certificate be provided with the Reed Relay?
If your purchase needs any calibration or test document for the Reed Relay, please raise it with us through the contact page before ordering, and we will confirm what paperwork can accompany the supply.
What should a quotation request for the Reed Relay include?
State the number of Reed Relay units, whether you also need the signal generator, capacitor and meter, and your delivery location. With these details ScienceLab can prepare one quotation covering the complete capacitance practical.
Request a Quote
To order the Reed Relay, send your requirement through our contact page or add it to the enquiry cart and submit it for a quotation. We respond with supply details for single laboratories and bulk orders alike.
Last updated: 24 September 2026
