Thyristor Time Delay Relay with Power Supply Manufacturer,Supplier and Exporter in India
Product Code : SCL-EELE-12886
Indian Lab Suppliers supplies the Thyristor Time Delay Relay with Power Supply (Product ID: 12886) as part of its electronics engineering lab equipment range. It uses a UJT timer to fire SCRs and a TRIAC, giving either a delayed turn-on or an automatic turn-off of a DC or AC load.
Quick Answer
Pressing the start button begins a UJT (2N2646) timing ramp; the delay is set by a potentiometer and a choice of three capacitors. For DC loads, two SCRs in a parallel-coupled circuit with a commutation capacitor give delayed turn-on and automatic turn-off, powered by the internal 12 V DC, 2 A supply. For AC, a TRIAC acts as a line switch with the same two modes, driving a 15 W, 230 V lamp. The board runs from 230 V ±10%, 50 Hz mains; the lamp circuit is live, so change connections with power off.
Key Specifications
| Parameter | Detail |
|---|---|
| Experiments | Delayed turn-on and auto turn-off of a DC load; the same for a TRIAC line switch |
| DC supply | 12 V DC, 2 A, internal |
| Timer | UJT 2N2646; ramp potentiometer; set of 3 timing capacitors |
| DC switch | 2 SCRs, parallel coupled, with commutation capacitor |
| AC switch | TRIAC with 15 W, 230 V lamp load |
| Start | Push button |
| Mains | 230 V ±10%, 50 Hz |
| Connections | 4 mm stackable patch cords, 0.5 m |
Where This Is Used
Used in timing and relay practicals with the Electronic Timer Using IC-555 with Power Supply (Product ID: 12916) and the Triac A.C. Line Switching with Power Supply (Product ID: 12885). Browse the full Electronics Engineering Lab Equipment range or related Electronics Lab Equipment products.
Frequently Asked Questions
How is the delay adjusted?
With the ramp potentiometer and by choosing one of three timing capacitors.
Why is a commutation capacitor needed?
An SCR on DC does not turn off by itself; the capacitor briefly reverse-biases it.
Can it switch AC loads?
Yes, through the TRIAC line switch and its 15 W lamp.
Related Categories
Electronics Engineering Lab Equipment · Electronics Lab Equipment · Engineering Lab Equipment
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