Motor Protection Relay Price in India: What Really Drives the Cost
“What is the price of a motor protection relay?” is one of the most common questions we get from panel builders, maintenance engineers and purchase teams. The honest answer is that it depends on what the relay has to protect against. Two relays that look similar on a datasheet can differ a lot in price because one only handles overload while the other also covers dry running, phase unbalance and earth faults.
This guide explains what drives the cost, how to compare quotations fairly, and why the cheapest relay is often the most expensive choice once you count motor rewinds and downtime.
1. Protection functions
This is the biggest price factor. A basic electronic overload relay covers overcurrent, phase loss and locked rotor. A digital motor protection relay adds functions such as:
- Undercurrent (dry run and loss-of-load protection)
- Phase unbalance and reverse phase
- Earth fault / ground fault with a ZCT
- Selectable definite-time or inverse-time tripping curves
- Trip memory and fault-cause display
For example, the EOCR SS is a compact analog relay for overcurrent, phase loss and locked rotor, while the EOCR 3DE / 3EZ adds undercurrent, unbalance, reverse phase and (on the 3EZ) ground fault protection. The second costs more because it replaces several separate devices.
2. Current range and CTs
Relays for small motors connect directly. Above a certain current (for example above 60 A on the EOCR SS, or above 80 A definite-time on the 3DE) you need external current transformers. When comparing prices, check whether the quote includes the CTs, and for earth fault protection whether it includes the CBCT / ZCT.
A wide-range relay can also lower your total cost. The 3DE / 3EZ covers 0.5 A to 600 A (with external CTs), so one model can serve many motor ratings and you stock fewer spares.
3. Analog dial or digital display
Analog relays use dials and LEDs. Digital relays show the actual motor current and the cause of each trip. The display costs a little more, but it doubles as a panel ammeter and shortens troubleshooting. Your electrician can see “undercurrent” or “phase loss” instead of guessing.
4. Supply voltage and mounting
Universal supply (for example 24–240 V AC/DC on the EOCR SS) lets one part number work across panels. DIN-rail or panel-mount options, and whether the relay sits on the contactor or separately, also change the price a little.
5. Brand, quality and support
Low-cost relays often save money on the current-sensing circuit, the calibration and the enclosure. In practice that means nuisance trips, settings that drift, or a relay that fails to trip when it should. Ask the supplier about:
- Accuracy and repeatability of the trip setting
- Availability of datasheets, wiring diagrams and trip curves
- Technical support for setting the relay on site
- Spares availability and lead times
How to compare two quotations
| Check | Why it matters |
|---|---|
| Same protection functions? | An overload-only relay is not comparable to one with dry run and earth fault |
| CTs / ZCT included? | Large motors and earth fault protection need them |
| Setting range fits the motor FLC? | A relay set at the edge of its range protects less accurately |
| Display and trip memory? | Saves troubleshooting time after every trip |
| Supply voltage | Universal supply avoids stocking several variants |
| Datasheet and support | Correct setting matters as much as the relay itself |
The real cost: what one motor failure costs
Compare the relay price with the cost of a single failure: rewinding or replacing the motor, pulling a submersible pump out of a borewell, lost production and overtime. For most industrial and pump applications, the price difference between a basic and a full-featured relay is small next to even one avoided failure. That is why we recommend choosing the relay by the risks on your site, not by the lowest quote.
Not sure which level of protection you need? Read our guides to the best motor protection relay and the types of electronic motor protection relay.
Frequently Asked Questions
Why do motor protection relay prices vary so much?
Mainly because of the protection functions included (overload only versus dry run, unbalance and earth fault), the current range, whether CTs are needed, and analog versus digital display.
Is an electronic overload relay more expensive than a thermal overload relay?
Usually a little, but it gives more accurate, adjustable protection, protects against phase loss and does not drift with ambient temperature. Over the life of the motor it is usually the better value.
How do I get an exact price for my motor?
Share the motor kW or full-load current, the supply voltage, the application (pump, fan, conveyor and so on) and the faults you want to protect against. Concord will recommend a model and send a quotation.
Talk to Concord
Concord Automation & Controls has supplied motor protection relays and industrial relays to Indian industry since 1996 and is the exclusive ComatReleco (Switzerland) distributor for India, Bangladesh and Mauritius. Share your motor, pump or panel details and we will recommend the right model: call or WhatsApp +91 96670 40511, email contact@concordrelay.com, or use our contact page.