Auto Mains Failure panels for DG sets from 10 kVA to 3000 kVA
An AMF (Auto Mains Failure) panel watches the incoming mains supply, starts the diesel generator automatically when the mains fails or goes outside voltage and frequency limits, transfers the load to the DG once it has stabilised, and transfers back and cools down the engine when mains returns — all without an operator. Accu-Panels Energy manufactures AMF panels for single DG sets from 10 kVA to 3000 kVA, and multi-DG synchronising panels for larger installations, on its CPRI type-tested IEC 61439 platform in Ahmedabad.
- Mains monitoring: the AMF controller checks all three phases for under/over-voltage, under/over-frequency and phase failure.
- Start delay: a short timer (typically 2–10 s) ignores momentary dips.
- Engine start: up to three crank attempts; alarms on fail-to-start.
- Warm-up and transfer: after the DG reaches rated voltage and frequency, the mains contactor/breaker opens and the DG contactor/breaker closes (electrically and mechanically interlocked).
- Return to mains: when mains is healthy for the return delay, load transfers back.
- Cool-down and stop: the engine runs unloaded for 2–5 minutes, then stops and returns to standby.
- Microprocessor AMF / genset controller with LCD display, event log and remote monitoring (Modbus / GSM) options
- Contactor-based changeover up to 630 A; MCCB or ACB motorised changeover above, with mechanical and electrical interlocks
- Battery charger, engine protections (low oil pressure, high coolant temperature, overspeed, fail to start)
- Auto / manual / test selector, emergency stop, hooter and lamp annunciation
- Metering of mains and DG (V, A, Hz, kW, kWh) with hour-run counter
- Optional load-shedding contacts and priority load control
- IEC 61439-1/2 assembly; switchgear per IEC 60947-2 / -4-1; CPRI type-tested design
- 415 V AC, 3-phase 4-wire, 50 Hz; DC control 12 V / 24 V from engine battery
- DG rating 10 kVA to 3000 kVA; changeover 32 A to 4000 A
- Short-time withstand 25 kA to 65 kA for 1 s
- IP42 / IP54 indoor, IP55 / IP65 outdoor (IEC 60529)
- 1.6 / 2.0 mm CRCA enclosure, 7-tank pre-treatment, powder coated; floor- or wall-mounted
Hospitals, hotels, data centres, telecom sites, commercial buildings, housing societies, pharmaceutical and food plants, cold storages, water pumping stations and any facility where DG backup must take over without an operator. For two or more DG sets, or DG-solar-grid operation, see our synchronising panels and auto changeover panels.
AMF vs ATS vs synchronising panel
An ATS / auto changeover panel only switches between two live sources. An AMF panel additionally starts, monitors and stops the DG engine. A synchronising panel runs two or more sources in parallel with load sharing. Choose AMF for a single DG on standby; choose synchronising when you have multiple DGs, a solar plant that must run with the DG, or need no-break transfer.
Frequently asked questions
How fast does an AMF panel restore power?
Typically 10 to 20 seconds from mains failure to DG on load, set by the start delay, crank time and warm-up timers.
Contactor or breaker changeover?
Contactors are economical up to about 630 A. Above that, or where short-circuit withstand matters, motorised MCCBs or ACBs with mechanical interlocks are used.
Can the AMF panel work with any DG make?
Yes. The controller interfaces with the engine’s start, stop, fuel solenoid and sensor circuits; we configure it for your genset and can retrofit existing DGs.
Can I monitor the DG remotely?
Yes. Controllers with Modbus RTU/TCP or GSM options report status, alarms and fuel/hours to a BMS or mobile app.
Lead time?
2 to 4 weeks for standard AMF panels up to 630 A; 4 to 6 weeks for breaker-based panels.
Tell us your DG kVA and load and our team will size the AMF panel and quote.
