AMF (Auto Mains Failure) Panels
Unattended changeover panels that start, load and stop a DG set on mains failure.
About AMF (Auto Mains Failure) Panels
An AMF (Auto Mains Failure) panel watches the incoming mains supply and runs the DG set without an operator. When mains voltage or frequency goes outside set limits, the controller starts the engine, waits for stable generator voltage and transfers the load. When mains returns and stays healthy, it transfers back, runs the set unloaded to cool down and stops it.
Microtech builds AMF panels in-house around a dedicated controller – for example the Deep Sea DSE7320 MKII, which senses three-phase mains and generator voltage, handles automatic start, stop and transfer, and talks Modbus over RS232/RS485 – or the genset maker's own controller. Changeover is through electrically and mechanically interlocked contactors, motorised breakers or an automatic transfer switch, using Lauritz & Knudsen or Schneider Electric switchgear.
Each panel is wired, tested and supplied with drawings, and commissioned with the DG set by our team in Uttar Pradesh.
Key specifications
| Function | Automatic start, load transfer, re-transfer and cool-down stop |
|---|---|
| Typical controller | Deep Sea DSE7320 MKII or genset OEM controller |
| Mains/generator sensing | 3-phase; 15–415 V AC ph-N, 3.5–75 Hz (DSE7320 MKII) |
| Communication | USB, RS232, RS485 with Modbus RTU (DSE7320 MKII) |
| Changeover | 4-pole, mains/DG interlocked – contactor, motorised breaker or ATS |
| Switchgear | Lauritz & Knudsen / Schneider Electric |
| Panel standard | IS/IEC 61439-1/2 |
Features & benefits
- Unattended start and changeover on mains failure
- Electrical and mechanical interlock prevents mains and DG paralleling
- Start, return and cool-down sequencing set up on the controller
- Engine protection shutdowns with alarm display
- Performance data logging on the controller (DSE7320 MKII)
- Modbus output for BMS or SCADA
Where it’s used
- Hospitals and nursing homes
- Residential societies and hotels
- Commercial buildings and banks
- Factories with standby DG sets
- Telecom and IT rooms
- Water pumping stations
Standards & compliance
AMF (Auto Mains Failure) Panels — FAQs
What does an AMF panel do?
It senses a mains failure, starts the DG set, moves the load to the generator once its voltage is stable, and moves it back to mains when supply returns – then lets the engine cool down and stops it. No operator is needed.
Can you add an AMF panel to my existing DG set?
Usually yes. The set needs an electric starter and the controller must be able to read its speed and engine sensors. We check this on site before quoting.
Which changeover device do you use?
It depends on rating: interlocked contactors or motorised breakers for most panels, or an automatic transfer switch to IS/IEC 60947-6-1. All are 4-pole and interlocked so mains and DG can never be connected together.
