Under Voltage Monitoring with Power Supply (C.R.) Manufacturer,Supplier and Exporter in India
Product Code : SCL-EELE-12280
Indian Lab Suppliers supplies the Under Voltage Monitoring with Power Supply (C.R.) (Product ID: 12280) as part of its electronics engineering lab equipment range. It detects when the AC mains falls below a set level and signals it with LEDs and a relay.
Quick Answer
The mains input is sampled and compared with a reference by an IC 741 used as a closed-loop comparator with hysteresis, so the output switches cleanly once and does not chatter near the trip point. When the voltage drops below the limit the LED status changes and the relay operates. Students lower the input with a single-phase 0-230 V, 1 A variac (not included) and note the trip and reset voltages. Internal supplies are ±15 V DC and 10 V DC, each 50 mA. The variac circuit carries mains voltage, so it should be wired and operated under supervision with the supply off while connecting.
Key Specifications
| Parameter | Detail |
|---|---|
| Experiment | Under-voltage detection of AC mains with LED indication |
| Circuit | IC 741 comparator with hysteresis, relay output |
| Indicators | LEDs |
| Supplies | ±15 V DC at 50 mA; 10 V DC at 50 mA (both internal) |
| Mains | 230 V ±10%, 50 Hz AC; ON/OFF switch, fuse and indicator lamp |
| Also required (not included) | Single-phase variac 0-230 V, 1 A |
Where This Is Used
Used in protection and monitoring-circuit practicals. Related: Window Detector with power supply and 1 meter (C.R.) (Product ID: 12276) and Phase Sequence Monitoring with Power Supply (Product ID: 12286). Browse the full Electronics Engineering Lab Equipment range or related Electronics Lab Equipment products.
Frequently Asked Questions
Why is hysteresis used?
It gives separate trip and reset levels so the relay does not chatter near the threshold.
What extra equipment is needed?
A single-phase 0-230 V, 1 A variac to vary the input.
How is the fault shown?
By LEDs and relay operation.
Related Categories
Electronics Engineering Lab Equipment · Electronics Lab Equipment · Electricity and Magnetism
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