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GIC MG73BH SM500 Voltage Monitoring Relay - 3 Phase / 1 Phase 4-Wire, 240VAC, Neutral Loss & Phase Sequence Protection

Rating:
90%
₹1,949.00 ₹ 1651.69 + 297.3 GST
In stock
SKU
PRO3086

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Advanced industrial-grade monitoring relay for 3-phase and 1-phase systems. Protects equipment from Phase Loss, Phase Sequence errors, and Neutral Loss with 2 C/O output.

Are you worried about a sudden neutral loss or phase reversal burning out your expensive 3-phase motors? The GIC MG73BH SM500 is a professional-grade monitoring relay designed for both 3-phase and 1-phase 4-wire systems. It acts as an automated sentry, constantly checking for Phase Loss, Phase Sequence errors, and the dreaded Neutral Loss. By instantly tripping your control circuit during a fault, it ensures that your pumps, compressors, and industrial panels remain isolated from damaging electrical conditions.

The Probots Quality Commitment
When it comes to high-voltage protection, reliability is the only metric that matters. This unit is Probots™ Lab Verified , having undergone rigorous testing in our Bangalore facility to ensure the trip timing and voltage thresholds match the manufacturer’s datasheet exactly. Because these are precision instruments, we utilize Probots™ Secure-Transit  packaging to ensure the internal mechanical relays are protected from high-G shocks during shipping. Furthermore, our Probots™ Tech-Bridge  ensures you have access to local engineering support if you encounter complex integration challenges in your control cabinet.

Unlock New Capabilities (Project Evolution)
If you have previously relied on simple thermal overloads or basic fuses, the SM500 represents a significant upgrade to your system's intelligence. While fuses only protect against overcurrent, this relay prevents the "silent" failures—like a loose neutral wire—that can cause massive voltage imbalances and destroy sensitive electronics. It is rated as an Intermediate installation task, requiring a standard 35mm DIN rail and basic control wiring knowledge. Upgrading to this relay allows you to build more resilient automation systems that can self-diagnose power health before allowing a motor to start.

 Virtual Technician & Wiring Guide
SAFETY WARNING: This device operates at lethal 240V/415V AC levels. Ensure the main isolator is locked out before installation. For a standard 3-phase 4-wire setup, connect your phases to L1, L2, and L3, and crucially, connect the system neutral to the 'N' terminal. The 2 C/O output contacts (Terminals 15-18 and 25-28) should be wired in series with your contactor's coil circuit. If the relay detects a phase sequence error (wrong rotation), the Red LED will light up, and the output will remain open, preventing the motor from running in reverse.

Specifications:

  • Model: MG73BH (SM500 Series)
  • System: 3-Phase / 1-Phase 4-Wire
  • Supply Voltage: 240V AC
  • Protection: Phase Loss, Phase Sequence, Neutral Loss
  • Output: 2 C/O Contacts (5A Resistive , 240VAC)
  • Mounting: 35mm DIN Rail / Base Mount
  • Enclosure: Flame Retardant
  • Trip Time: Fixed Industrial Grade

Key Applications:

  • Cold Storage: Protecting 3-phase compressors from reverse rotation.
  • Agricultural Pumps: Preventing motor burnout during single-phasing events.
  • Residential Elevators: Ensuring correct phase sequence for safety.
  • Server Rooms: Monitoring neutral integrity to prevent voltage surges on 1-phase hardware.

Project Evolution

  • Past Projects: If you have previously worked with simple voltage cut-off modules or basic 1-phase protectors, the SM500 is your entry into Industrial Grade Protection.
  • Feature Upgrade: This unit unlocks the ability to monitor Neutral Loss—a silent killer that causes voltage imbalances in 3-phase systems that standard fuses cannot detect.
  • Effort/Requirements: Intermediate. Requires basic understanding of AC wiring and DIN rail integration. Minimum hardware: DIN Rail, contactor, and basic electrical tools.

Virtual Technician & Wiring

SAFETY WARNING: This device handles lethal AC voltages. Always disconnect power before installation.

  • L1, L2, L3: Connect to the three phases.
  • N: Connect to the Neutral line (Critical for 4-wire monitoring).
  • 15-16-18 / 25-26-28: These are the 2 C/O output terminals. Use these to break the coil circuit of your main contactor.
  • Indicator LED: Green (Healthy), Red (Fault detected).

Package Includes:

1 X GIC MG73BH SM500 Voltage Monitoring Relay - 3 Phase / 1 Phase 4-Wire, 240VAC, Neutral Loss & Phase Sequence Protection

 

Frequently Asked Questions (FAQ)

  1. Can I use the GIC MG73BH for a single-phase system?
    Yes, it is rated for 1-phase 4-wire applications (monitoring L-N).
  2. What happens if the Neutral line is cut?
    The relay will detect "Neutral Loss" and trip the 2 C/O contacts to protect your load.
  3. Does this relay protect against Over-voltage?
    The MG73BH focuses on Phase/Neutral loss and Sequence; check the MG21 series for specific Over/Under voltage protection.
  4. Is the trip time adjustable?
    No, this model features a fixed industrial-standard trip time to prevent nuisance tripping while ensuring safety.
  5. Can I mount this on a standard DIN rail?
    Yes, it is compatible with standard 35mm DIN rails.
  6. What is the current rating of the output contacts?
    The internal relay is generally rated for 5A at 240VAC (Resistive).
  7. Does it require an external power supply?
    No, it is self-powered from the input phases.
  8. What is 'Phase Sequence' protection?
    It ensures that the phases are in the correct order (L1-L2-L3) so motors rotate in the intended direction.
  9. What does the Red LED indicate?
    A fault condition (Phase loss, sequence error, or neutral loss).
  10. Is this relay suitable for VFD outputs?
    No, it should be installed on the input side of the VFD.
  11. What is the housing material?
    It uses high-grade UL94-V0 flame retardant plastic.
  12. Can it operate in high-temperature environments?
    It is rated for up to 60°C ambient temperature.
  13. Is it compatible with 3-wire systems?
    This specific model (SM500) is designed for 4-wire systems (requires Neutral).
  14. What is the reset logic?
    It is an auto-reset relay; once the fault is cleared, the relay returns to the healthy state.
  15. Does it detect Phase Imbalance?
    It primarily detects total loss; for sensitivity-based imbalance, refer to the MG73BL series.
  16. What wire gauge is recommended for terminals?
    Up to 2.5mm² solid or stranded wire.
  17. How many changeover contacts does it have?
    It features two independent C/O contacts (2 C/O).
  18. Can I use this for solar inverter protection?
    Yes, it is ideal for monitoring the grid side of a 3-phase inverter.
  19. What is the enclosure protection rating?
    Typically IP20 for terminals and IP40 for the enclosure.
  20. Is this a genuine GIC product?
    Yes, Probots sources directly from verified industrial channels.
More Information
Technical Details

Specifications :

Parameter Description
Supply Voltage  240 VAC (1 Phase & 3 Phase
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Probots sells every Electronics Part for your next Project. You can order 10,000+ Electronic Parts Online - Arduino, Raspberry Pi, NodeMCU Development Boards, Sensors, Motors, Motor Drivers, SMPS, Plastic Enclosures etc in India directly on probots.co.in

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Raja Ramakrishna

We are into electronics & mechanical projects in this connection we had contacted probots & we visited them , To our pleasant surprise , their presentation with us was friendly wrapped with professional support , which helped us to choose better , this interaction was patient & excellent .with all confidence i shall promote them to my known sources looking for components . Pls maintain this attitude towards customer this shall take your organization to heights

Jay Kumar

Great place to get all electronic components and accessories for electronic products.

Mohan Rao

Srinivasan Sriram

I had ordered something, will write review after the order process is complete.

Chand Basha Shaik

Ordered a couple of times, Bad Experience. They charge premium delivery fee but delivery will not happen on time(every time). And the resopnce after sales on the issues such as delivery is slow and not friendly. If you can take the delivery at your own risk, and liesure you can order.

Kakunje Software Pvt.Ltd.

I would like to share a suggestion based on my recent experience. I am also running a private limited company and understand how important customer relationships are. One key area that needs attention is training employees on how to deal with customers professionally and respectfully. No business starts with bulk orders—every relationship begins small and grows with trust. I had some plans to collaborate when I visited your facility, but unfortunately, due to the way I was treated, I decided not to proceed with any future business plans. I believe this is not a reflection of the owner, but rather an issue with employee conduct. Proper training and customer handling can significantly improve business growth and reputation. As I do not have a direct contact, I am sharing this feedback here. If you would like to discuss further, please feel free to contact me. Our recent bill was under the name Electro Instruments.

Vu3Hzr Vu3Hzr

Fast Delivery, Accurate information, Quick resolution, most important acceptance & accountability and willingness to help.

Nischith shetty

Friendly staff but Too costly, price is 2x as compared to SP road.

Lahari Lahari

Varshaa Senthil kumar

The products were at reasonable cost and the service and care provider by the whole team to deliver it safe was really awesome I initially didn't receive the delivery but it was my fault it was with security Though they did their job right .they cared to make sure I got my order The team which delivered the products to me was really kind and did their job well

Vishak Raj

Rhea J M

SK

Quick and effective customer support

Suhas Krishna

I have been procuring components for some of my projects through Probots for more than a year now. Their service is prompt and commendable.

Rajkumar M

Good Responsive and Quick Replies for updates

Girish Swamy

Prompt, genuine and quick. Wide range of electronic components especially for builders and prototyping

Sudhanthiran Sugan

Hanish KVC

Online shop (they also have offline shop in Bengaluru) for buying electronic dev kits and accessories. I was able to connect through WhatsApp, for a shipment related issue that cropped up. They also followed up to confirm receipt of the parcel.

Narendra Bv

somaskanda .s

Very responsive! Quickly resolves any issues!

Tejas Sreenivas

I ordered online for store pickup and they packed it fast and sent items via rapido, fast packing and delivery. Thank you

Gangatharan J

Prompt delivery and friendly support.

sudam tandi

Nambi E

Cuustomer-friendly electronics component shop. The staff is very responsive, helpful, and knowledgeable. They guide properly and make the buying process easy. Overall, a great place for electronics components.

Sabari M

Thanks for your support in timely delivery

gowrisankar s

Aninda Mukhopadhyay

Pradeep Hegde

Quick response... Good quality

Manshi EA CE

Good services and coordination.

sneha parthi

Raja Ramakrishna

We are into electronics & mechanical projects in this connection we had contacted probots & we visited them , To our pleasant surprise , their presentation with us was friendly wrapped with professional support , which helped us to choose better , this interaction was patient & excellent .with all confidence i shall promote them to my known sources looking for components . Pls maintain this attitude towards customer this shall take your organization to heights

Jay Kumar

Great place to get all electronic components and accessories for electronic products.

Mohan Rao

Srinivasan Sriram

I had ordered something, will write review after the order process is complete.

Chand Basha Shaik

Ordered a couple of times, Bad Experience. They charge premium delivery fee but delivery will not happen on time(every time). And the resopnce after sales on the issues such as delivery is slow and not friendly. If you can take the delivery at your own risk, and liesure you can order.

Kakunje Software Pvt.Ltd.

I would like to share a suggestion based on my recent experience. I am also running a private limited company and understand how important customer relationships are. One key area that needs attention is training employees on how to deal with customers professionally and respectfully. No business starts with bulk orders—every relationship begins small and grows with trust. I had some plans to collaborate when I visited your facility, but unfortunately, due to the way I was treated, I decided not to proceed with any future business plans. I believe this is not a reflection of the owner, but rather an issue with employee conduct. Proper training and customer handling can significantly improve business growth and reputation. As I do not have a direct contact, I am sharing this feedback here. If you would like to discuss further, please feel free to contact me. Our recent bill was under the name Electro Instruments.

Vu3Hzr Vu3Hzr

Fast Delivery, Accurate information, Quick resolution, most important acceptance & accountability and willingness to help.

Nischith shetty

Friendly staff but Too costly, price is 2x as compared to SP road.

Lahari Lahari

Varshaa Senthil kumar

The products were at reasonable cost and the service and care provider by the whole team to deliver it safe was really awesome I initially didn't receive the delivery but it was my fault it was with security Though they did their job right .they cared to make sure I got my order The team which delivered the products to me was really kind and did their job well

Vishak Raj

Rhea J M

SK

Quick and effective customer support

Suhas Krishna

I have been procuring components for some of my projects through Probots for more than a year now. Their service is prompt and commendable.

Rajkumar M

Good Responsive and Quick Replies for updates

Girish Swamy

Prompt, genuine and quick. Wide range of electronic components especially for builders and prototyping

Sudhanthiran Sugan

Hanish KVC

Online shop (they also have offline shop in Bengaluru) for buying electronic dev kits and accessories. I was able to connect through WhatsApp, for a shipment related issue that cropped up. They also followed up to confirm receipt of the parcel.

Narendra Bv

somaskanda .s

Very responsive! Quickly resolves any issues!

Tejas Sreenivas

I ordered online for store pickup and they packed it fast and sent items via rapido, fast packing and delivery. Thank you

Gangatharan J

Prompt delivery and friendly support.

sudam tandi

Nambi E

Cuustomer-friendly electronics component shop. The staff is very responsive, helpful, and knowledgeable. They guide properly and make the buying process easy. Overall, a great place for electronics components.

Sabari M

Thanks for your support in timely delivery

gowrisankar s

Aninda Mukhopadhyay

Pradeep Hegde

Quick response... Good quality

Manshi EA CE

Good services and coordination.

sneha parthi

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