Overcurrent And Earth Fault Relay
Product Code : LSK-EPS-10530
Overcurrent And Earth Fault Relay (SKU LSK-EPS-10530) is an entry-level three-phase and earth fault overcurrent relay, built around an industrial relay and presented in an educational format. Mounted on the Protection Relay Test Set, it lets electrical engineering students program and test protection settings for transformers, transmission lines and distribution schemes. Science Lab Supplies quotes and dispatches the module from Ambala, India, for engineering colleges, polytechnics, tender contractors and distributors.
Specifications
Each protection function and fitting of the overcurrent and earth fault module has its own row below. In short, the relay sits in a robust carrying enclosure on the test set desk, links to it by multi-core cable and safety leads, and sees the fault circuits through current transformers matched to its inputs.
| Specification | Value |
|---|---|
| SKU | LSK-EPS-10530 |
| Relay type | Entry-level three-phase and earth fault overcurrent relay, educational format |
| Basis | Industrial relay |
| Housing | Robust enclosure with carrying handle |
| Mounting | Desk area of the Protection Relay Test Set |
| Connection to test set | Multi-core cable and safety leads |
| Connection to fault circuits | Current transformers with ratio to suit the relay inputs |
| Programming | Keypad and display on the module |
| Software | Relay support software (supplied with the test set) on a suitable computer |
| Overcurrent stages | Three independent three-phase earth and overcurrent stages |
| Stage 1 characteristic | Any of 12 IDMT curves |
| Stages 2 and 3 characteristic | Direct time |
| Negative-phase sequence overcurrent | Two independent stages |
| Restricted earth fault | High impedance |
| Thermal overload protection | Yes |
| Broken conductor detection | Yes |
| Undercurrent | Yes |
| Selectable blocking | Yes |
| Records | Trend, fault and disturbance records |
| Circuit monitoring | Yes |
| Simultaneous testing | Test set has connections for two relay modules |
| Other use | Optional ancillary for selected power systems products |
| Supplied by | Science Lab Supplies, Ambala, India |
Applications and Experiments for the Overcurrent and Earth Fault Relay
With the relay, students can set up fault circuits on the test set, program its settings and record when it trips. Because the current transformer ratio, connection and rating all change what the relay sees, the module shows how instrument transformers shape relay behaviour in switchgear and protection practicals.
- B.E./B.Tech switchgear and protection lab: IDMT time–current characteristics.
- Earth fault and restricted earth fault tests on transformer circuits, building on the winding connections studied with the Transformer Trainer.
- Grading and discrimination with a second relay on the same test set, alongside line studies on the Transmission Line Simulator.
Test currents come from mains-powered circuits, so rewire with the supply off and test under qualified supervision.
Standard Scope of Supply
The relay is supplied as a single module in its carrying enclosure, ready to program from its keypad. The Protection Relay Test Set, which comes with the relay support software, and a computer are separate items; connecting cables and any optional accessories are listed on the quotation.
Packing, MOQ and Lead Time
Order one relay for an existing test set or a matched group for a new protection laboratory. Each quotation states packing, delivery time and price for the quantity requested, and other engineering lab equipment in India from this range can be added.
As a registered exporter with an Importer-Exporter Code, Science Lab Supplies can ship to buyers in South Africa, Qatar, Sri Lanka, Vietnam, Malaysia and Peru. For a price on one relay or a full protection bench, describe your test set through the contact page, drop the module into the enquiry cart, or use the lab tender page for formal bids.
Frequently Asked Questions
Which time curves does the overcurrent function offer?
The first of its three overcurrent stages can be set to any of 12 IDMT curves, and the other two use a direct time characteristic, so students can compare inverse-time and definite-time grading on one relay.
Does the relay need the Protection Relay Test Set?
It is designed to mount on that test set, which provides the fault circuits and support software. It is also offered as an optional add-on for selected power systems products.
Who supplies the Overcurrent And Earth Fault Relay?
Quotations for this relay come from Science Lab Supplies in Ambala, India. A laboratory that already owns the test set can order the module on its own, or price it together with the test set and the other protection relays.
Can two relays be tested at the same time?
Yes. The test set has connections for two relay modules, so students can run discrimination exercises between this relay and a second one fitted on the same desk.
Related Protection and Power System Trainers
These Electrical Power System items share the relay's test set or extend its practicals: the other relays add differential, feeder and distance protection, and the trainers and transformer provide circuits to protect. Any of them can go on one quotation.
- Protection Relay Test Set — meters, CTs, VTs, power supplies, a configurable transformer and load resistors for relay tests.
- Differential Protection Relay — numerical relay for two-winding apparatus.
- Feeder Management Relay — overhead line and underground cable protection.
- Distance Protection Relay — distance protection for overhead transmission lines.
- Circuit Breaker Trainer — fuses and magnetic, thermal and thermomagnetic circuit-breakers in four fault circuits.
- Distribution Trainer — circuits with current transformers for the protection relays on its panels.
- Three Phase Mobile Transformer — all tappings brought out to coloured, shrouded sockets.
Browse the full Electrical Power System range, the Electrical and Electronics range, or all engineering laboratory equipment.
Last updated: 22 October 2026
