Description
Automatic / Manual Dual Power Transfer Switch for Main Grid, Generator, IPS, Inverter & Backup Power Systems
The FANHEY 125A 4P Automatic Transfer Switch (ATS) is designed to automatically transfer electrical loads between two power sources, such as utility grid and generator, grid and inverter, or main power and backup power.
When the primary power source fails or becomes unavailable, the ATS can switch the load to the backup source. When normal power returns, the system can transfer the load back to the primary supply according to its operating configuration.
এই FANHEY 125A 4P Automatic Transfer Switch main electricity এবং backup power source-এর মধ্যে automatic power transfer করার জন্য ব্যবহার করা হয়। Main line বন্ধ হলে generator, IPS বা inverter backup source-এ load transfer করা যায় এবং main supply ফিরে এলে আবার primary source-এ switch করা যায়।
It is suitable for residential, commercial, office, solar backup and small industrial electrical systems where reliable source switching is required.
Product Highlights / প্রধান বৈশিষ্ট্য
✅ 125A rated current
✅ 4 Pole (4P) switching
✅ Automatic transfer between two power sources
✅ Manual changeover option with front rotary handle
✅ Suitable for grid + generator applications
✅ Suitable for grid + inverter / IPS backup systems
✅ Can be used in solar backup power systems
✅ DIN / panel style mounting design
✅ Source status indication LEDs
✅ Compact integrated transfer switch design
✅ Suitable for single-phase 4-wire or compatible system design depending on wiring configuration
✅ Useful for home, office, commercial and backup power installations
Applications / ব্যবহার ক্ষেত্র
• Main grid + generator transfer
• Grid + inverter backup system
• Grid + IPS system
• Solar hybrid backup system
• Home backup power distribution
• Office electrical backup
• Shop and commercial building
• Server / communication equipment backup
• Small industrial control panel
• Generator changeover system
• Automatic backup supply switching
• Electrical distribution panel
Package Includes / প্যাকেজে যা থাকছে
✅ 1 × FANHEY 125A 4P Automatic Transfer Switch
⚠️ Cable, MCCB/MCB, enclosure, generator controller, inverter, SPD, installation accessories and wiring are not included unless mentioned separately.
Technical Specifications / স্পেসিফিকেশন
• Product Type: Automatic Transfer Switch / ATS
• Brand: FANHEY
• Model Series: FHM1-125 / as marked on product
• Rated Current: 125A
• Pole: 4P
• Rated Voltage: AC 400V class as marked on unit
• Operation: Automatic / Manual
• Transfer Type: Dual Power Source Transfer
• Control Method: Automatic transfer with manual rotary override
• Status Indication: LED source indicators
• Mounting: Electrical panel / distribution board mounting
• Recommended Use: Grid-generator, grid-inverter, IPS and backup power system
⚠️ Exact utilization category, insulation voltage and short-circuit ratings should be confirmed from the printed label of the supplied batch before engineering design.
How It Works / কীভাবে কাজ করে
The ATS monitors two available power sources:
Source N / Primary Source
Normally connected to utility grid or preferred power source.
Source R / Backup Source
Can be connected to generator, inverter, IPS or another standby supply.
When the preferred source fails, the ATS transfers the load to the alternate source according to its internal control logic.
Main power ফিরে এলে ATS আবার primary source-এ load transfer করতে পারে।
Automatic & Manual Operation
The front rotary handle allows manual source selection or manual operation depending on the switch mode.
This is useful during:
• Maintenance
• Testing
• Generator inspection
• Backup system troubleshooting
• Emergency manual transfer
Typical Connection Concept
A common installation may use:
Primary Input: Utility / Grid
Backup Input: Generator / Inverter / IPS
Output: Load distribution board
⚠️ Actual wiring must follow the terminal markings and manufacturer diagram printed on the unit or supplied manual.
Why Use a 4-Pole ATS?
A 4-pole transfer switch can switch multiple conductors together and is commonly selected where neutral switching is required by the system design.
The correct pole configuration depends on:
• Electrical distribution system
• Generator earthing arrangement
• Inverter topology
• Neutral bonding
• Local electrical code
• Protection design
A qualified electrician should determine whether 4-pole switching is appropriate for the installation.
Suitable for Solar / Inverter Backup Systems
The ATS can be useful in systems where loads need to switch between:
• Grid ↔ Inverter
• Grid ↔ Generator
• Grid ↔ Hybrid solar backup
• Generator ↔ Inverter backup
It does not replace a solar inverter, charger or battery management system. Its main function is power-source transfer.
Important Installation Notes / গুরুত্বপূর্ণ নোট
⚠️ Installation should be done by a qualified electrician.
⚠️ Always isolate all power sources before wiring.
⚠️ Verify phase, neutral and source terminal markings carefully.
⚠️ Do not exceed the rated current.
⚠️ Use correctly rated upstream MCB/MCCB and protection devices.
⚠️ Proper cable size must be selected according to current and installation length.
⚠️ Use appropriate earthing and surge protection.
⚠️ Do not assume the ATS provides overload or short-circuit protection unless specifically stated.
⚠️ Confirm generator/inverter compatibility before installation.
⚠️ Product label, terminal arrangement and internal specification may vary slightly by stock batch.
Frequently Asked Questions / FAQ
What is the rated current?
The unit shown is rated at 125A.
How many poles does it have?
It is a 4-pole (4P) transfer switch.
Can it switch between grid and generator?
Yes, this is one of the common applications.
Can I use it with an inverter or IPS?
Yes, provided the inverter/IPS output and electrical system are compatible with the ATS.
Does it work automatically?
Yes. It is designed for automatic source transfer, with manual operation also available.
Can it be used in a solar system?
Yes, it can be used as part of a solar backup system for source changeover, but it does not replace the solar inverter.
Does it protect against overload?
Do not rely on the ATS as the main overload/short-circuit protection. Use properly rated MCB/MCCB according to the system design.
Can I install it myself?
For a 125A mains installation, professional electrician installation is strongly recommended.
FANHEY 125A 4P Automatic Transfer Switch ATS Dual Power Changeover
Buy FANHEY 125A 4P Automatic Transfer Switch ATS for grid, generator, inverter, IPS and solar backup power systems. Automatic/manual dual power changeover switch for home, office and commercial use.
