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. As a laboratory equipment supplier in India, Science Lab Supplies sends it from Ambala to engineering colleges, polytechnics, tender contractors and distributors.
Specifications
The module sits in a robust enclosure with a carrying handle and rests on the desk area of the test set, joined by a multi-core cable and safety leads. Current transformers matched to its inputs link it to the fault circuits.
| Parameter | Value |
|---|---|
| SKU | LSK-EPS-10530 |
| Housing | Robust enclosure with carrying handle |
| Programming | Module keypad and display, or relay support software (supplied with the test set) |
| Overcurrent | Three independent stages; first selectable from 12 IDMT curves, others direct time |
| Negative-phase sequence overcurrent | Two independent stages |
| Other functions | High impedance restricted earth fault, thermal overload, broken conductor detection, undercurrent, selectable blocking |
| Records | Trend, fault and disturbance records; circuit monitoring |
| Supplied by | Science Lab Supplies, Ambala, India |
Applications and Experiments for the Overcurrent and Earth Fault Relay
Students set up fault circuits on the test set, program the relay 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.
- Grading and discrimination with a second relay on the same test set.
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. Add the relay to the enquiry cart, write through the contact page, or see the lab tender page for tender orders.
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?
Science Lab Supplies supplies it from Ambala, India, either on its own for a laboratory that already owns the test set or 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.
Related Protection Relay Equipment
These items share the same test set and enclosure format. The test set provides the fault circuits, and the other three relays take the practical from overcurrent grading to differential, feeder and distance protection, all on one quotation.
- Protection Relay Test Set — meters, CTs, VTs 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.
Browse the full Electrical Power System range or all engineering laboratory equipment.
Last updated: 25 September 2026
