---
product_id: 395899557
title: "GIC MD21DF Voltage Monitoring Relay SM 175 208-480 VAC 3 Phase 5Amps"
brand: "gic"
price: "฿2080"
currency: THB
in_stock: true
category: "Gic"
url: https://www.desertcart.co.th/products/395899557-gic-md21df-voltage-monitoring-relay-sm-175-208-480-vac
store_origin: TH
region: Thailand
---

# 208-480 VAC 3-phase range LED fault & status indicators Phase loss, reversal & asymmetry protection GIC MD21DF Voltage Monitoring Relay SM 175 208-480 VAC 3 Phase 5Amps

**Brand:** gic
**Price:** ฿2080
**Availability:** ✅ In Stock

## Summary

> ⚡ Stay ahead of power failures with precision monitoring!

## Quick Answers

- **What is this?** GIC MD21DF Voltage Monitoring Relay SM 175 208-480 VAC 3 Phase 5Amps by gic
- **How much does it cost?** ฿2080 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.th](https://www.desertcart.co.th/products/395899557-gic-md21df-voltage-monitoring-relay-sm-175-208-480-vac)

## Best For

- gic enthusiasts

## Why This Product

- Trusted gic brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Smart Fault Defense:** Automatically detects and protects against phase loss, reversal, and asymmetry to safeguard your equipment.
- • **Instant Visual Alerts:** Integrated LED indicators provide real-time fault and status updates, keeping you informed at a glance.
- • **Compact & Robust Design:** Small footprint (4x3x6 cm) with a durable build, perfect for professional industrial setups.
- • **Triple-Phase Power Mastery:** Seamlessly monitors 3-phase voltages from 208 to 480 VAC for ultimate system reliability.
- • **Customizable Voltage Safeguards:** Select under-voltage, over-voltage, and asymmetry trip levels with adjustable time delays for tailored protection.

## Overview

The GIC MD21DF Voltage Monitoring Relay SM 175 is a compact, high-performance device designed to protect three-phase electrical systems operating between 208 and 480 VAC. It offers advanced protection against phase loss, reversal, and asymmetry, with selectable voltage trip settings and time delays. Featuring clear LED fault indicators and a reliable 5A contact rating, it ensures your industrial equipment runs safely and efficiently.

## Description

GIC SM 175 Voltage Monitoring Contact Rating: 5A at 250 VAC / 30 VDC (Resistive), Storage Temperature : -20 to +80 degree C, Tsin : T005023823, Voltage : 208 – 480 VAC. It provides protection against phase loss, phase reversal & phase asymmetry and it can be configured for 3 phase 4 wire or 1 phase system. It is selectable over voltage / under voltage trip level and selectable time delay. The LED indications for power and fault conditions with voltage sensing principle of 1 c/o or 2 c/o configuration.

## Features

- Protects against Phase Loss, Phase Reversal & Phase Asymmetry
- Multi-Voltage: Three Phase wire @ 208 – 480 VAC
- Selectable Under Voltage / Over Voltage & Asymmetry
- LED Indication for all Faults & for change in settings during run time for better security
- 1 C/O Configuration

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B09GLT73T3 |
| Best Sellers Rank | #19,373 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #4 in Voltage Monitoring Relays |
| Brand | GIC |
| Colour | black |
| Customer Reviews | 4.1 4.1 out of 5 stars (14) |
| Date First Available | 18 September 2021 |
| Item Dimensions LxWxH | 40 x 30 x 60 Millimeters |
| Item Height | 6 Centimeters |
| Item Weight | 300 g |
| Item Width | 30 Millimeters |
| Item part number | MD21DF |
| Manufacturer | GIC |
| Net Quantity | 1.00 Count |
| Number of Memory Sticks | 1 |
| Product Dimensions | 4 x 3 x 6 cm; 300 g |

## Images

![GIC MD21DF Voltage Monitoring Relay SM 175 208-480 VAC 3 Phase 5Amps - Image 1](https://m.media-amazon.com/images/I/31QUc9SiSxL.jpg)
![GIC MD21DF Voltage Monitoring Relay SM 175 208-480 VAC 3 Phase 5Amps - Image 2](https://m.media-amazon.com/images/I/31UDF4S6qRL.jpg)
![GIC MD21DF Voltage Monitoring Relay SM 175 208-480 VAC 3 Phase 5Amps - Image 3](https://m.media-amazon.com/images/I/31gxiqaq9oL.jpg)
![GIC MD21DF Voltage Monitoring Relay SM 175 208-480 VAC 3 Phase 5Amps - Image 4](https://m.media-amazon.com/images/I/41CYySfR-lL.jpg)
![GIC MD21DF Voltage Monitoring Relay SM 175 208-480 VAC 3 Phase 5Amps - Image 5](https://m.media-amazon.com/images/I/41NRGuxp1kL.jpg)

## Frequently Bought Together

- GIC MD21DF Voltage Monitoring Relay SM 175 208-480 VAC 3 Phase 5Amps
- Schneider Electric LC1E0910 Power Contactor - ETVS 25A 1NO (3 Pole AC Control), Grey
- GIC Make SM 301 Single Phasing Preventor SPP 3 PH 415 VAC (Cat No: MA51BC.)

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**Shop now:** [https://www.desertcart.co.th/products/395899557-gic-md21df-voltage-monitoring-relay-sm-175-208-480-vac](https://www.desertcart.co.th/products/395899557-gic-md21df-voltage-monitoring-relay-sm-175-208-480-vac)

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*Product available on Desertcart Thailand*
*Store origin: TH*
*Last updated: 2026-02-23*