Diesel genset auto-start & paralleling cabinets
- Auto-start: on mains failure (including phase loss and undervoltage), automatically starts the diesel generator; failed starts retry automatically and raise an alarm
- ATS transfer: automatic transfer between mains and generator; transfer time and sequence configured to load requirements
- Return logic: after the mains returns, transfers back to mains first, then the diesel engine runs no-load for cool-down and shuts down automatically, protecting the turbocharger
- Protection: water temperature, oil pressure, overspeed, overcurrent, undervoltage and overload protection; three-remote (telemetry / telesignaling / telecontrol) interface included
- Paralleling: multi-genset paralleling and load sharing customized per project design (quoted separately)
Specifications
The table below covers 80% of factory distribution room cases. Anything outside it we can still build — those are engineered items, quoted separately, with an indicative price the same day.
| Type | Floor-standing control panel; can be combined with the ATS transfer panel in one enclosure or supplied as separate panels |
|---|---|
| Standard sizes (W×D×H) | 600×600×1800 / 800×600×2000 mm, selected by capacity and number of circuits |
| Enclosure construction | 2.0 mm cold-rolled carbon steel, bent and welded with reinforcing ribs, electrostatic powder coated |
| Surface treatment | Degrease → derust → phosphating → electrostatic powder coating 60-80 μm, baked at 200 °C for 30 minutes |
| IP rating | IP54 standard / IP55 / IP65 optional (upgrade recommended for generator rooms or outdoor side mounting) |
| Installation | Floor-mounted in the generator room or electrical room; leave ≥800 mm service access in front of the panel |
| Vibration considerations | When installed in the same room as the genset, use a vibration-damped or separate foundation for the panel |
| Cable entry | Bottom cable entry with gland plate; generator-side and mains-side incoming cables labeled separately |
| Capacity range | Suits low-voltage backup power systems up to ≤2000 A (larger capacities quoted separately per project design) |
|---|---|
| Auto-start logic | Auto-start is triggered by mains failure, phase loss, or undervoltage; failed starts are retried automatically (retry count configurable) with an alarm output |
| Transfer device | ATS automatic transfer (PC class / CB class) or contactor transfer, selected by load type and required transfer time |
| Return logic | Once mains power is restored and confirmed stable, load transfers back to mains; the diesel engine runs unloaded for 3–5 minutes to cool down, then shuts down automatically |
| Protection | Generator-side overcurrent, overload, undervoltage, and reverse power protection; diesel engine coolant temperature, oil pressure, and overspeed signals are wired in |
| Three-remote interface | Telemetry (voltage / current / frequency and power), telesignaling (run / fault / power status), and telecontrol (start/stop) |
| Communication | Modbus / Profinet, can connect to the control room supervisory system or building management system |
| Parallel operation (optional) | Parallel operation of multiple generators, load sharing, and disconnection logic, customized per project design |
| Standalone auto-start + ATS | One diesel generator + ATS transfer; starts automatically and picks up load on mains failure — the most common configuration |
|---|---|
| Duty/standby generator pair | Two generators in duty/standby operation; if the duty unit fails to start, the standby unit takes over automatically |
| Transfer with fire / critical load | Critical loads on dedicated circuits are supplied first after a power failure; remaining loads are connected as required |
| UPS coordination | Coordination with UPS: the UPS rides through the transfer gap, and the ATS takes over once the generator is carrying load |
| Mobile generator interface | Quick-connect terminals and transfer device reserved for a mobile generator, for temporary connection during emergencies |
| Parallel operation configuration | Parallel operation and load sharing of multiple generators, customized per project design (quoted separately) |
| Reference standards | GB/T 7251.1 / IEC 61439-1 (assemblies); GB/T 14048.11 (automatic transfer switching equipment) |
|---|---|
| Clearance & creepage | Meets pollution degree 3 and overvoltage category III requirements |
| Insulation resistance | ≥1 MΩ (500V megohmmeter) |
| Power frequency withstand voltage | Main circuit 2500V / 1 min, control circuit 1500V / 1 min |
| Transfer sequence verification | Mains failure and restoration are simulated before shipment; auto-start, transfer, return, and cooldown shutdown are all verified end to end |
| Routine tests (every unit) | Circuit checks, insulation and dielectric withstand, ATS manual / automatic transfer, protection operation, and three-remote signal verification |
| Documents with shipment | Electrical schematic, terminal wiring table, sequence description and parameter setting table, BOM, test report, and factory photos |
Five steps to specify your run
A configuration summary is generated as you go. It travels with your inquiry, saving a round of confirmation.
Build details
Systems have been in service for decades, and the failure points are always the same few: poor busbar contact, water ingress at the door seal, high temperature rise in the correction cabinet, and mis-phased outgoing feeders. The six hard rules below are written for exactly these points — every cabinet can be traced to them.
Cool-down shutdown
After utility power returns, transfer back to utility first and let the diesel engine run unloaded for 3–5 minutes before shutdown. Shutting down under load leaves the turbocharger heat with nowhere to go, and over time that means expensive repairs.
Transfer sequence locked
The five-step sequence — start, voltage build-up, transfer, return, shutdown — is tested and recorded at the factory before shipment. Get this logic backwards and nothing alarms; it only shows up during an actual outage.
Automatic retry on failed start
If the diesel engine fails to start on the first attempt, it retries automatically (count configurable) and outputs an alarm. Most standby power failures are not a total failure to start — they are a failure to start the first time.
Status signals to the duty room
Three signal groups — telemetry, status, and control — are wired to a terminal block and tied into the duty room or the building management system. Standby power runs unattended most of the time, so its status has to be visible.
Foundation when installed in the same room
When installed in the same room as the generator set, the cabinet base is vibration-isolated or set on an independent foundation. Long-term vibration loosens terminals and degrades component contact, and faults of this kind are hard to trace on site.
Full power-loss sequence simulation
Before shipment, two complete cycles of utility power loss and recovery are simulated, and the measured timing sequence for auto-start, transfer, retransfer, and cooldown shutdown is recorded and delivered with the cabinet.
Photos & enclosure construction
Below are photos taken in our own shop — from the complete unit down to the internal busbars and secondary wiring. Every build detail can be checked item by item.
Image key: 01–05 are shop photos (the numbers match the shot list). The line drawing shows the front elevation of the enclosure; dimensions match the specification table above.
Where these cabinets go
These are the routine applications — we can talk scheme and configuration directly. For the industry view, see the industry pages.
Factory standby power
Backup utility supply for critical production lines and continuous-process equipment.
Commercial and hospital buildings
Standby power transfer for fire loads, emergency lighting, elevators, and other critical loads.
Data centers and equipment rooms
Standby power transfer and status monitoring in coordination with UPS systems.
Municipal pump stations and wastewater plants
Standby power for pump stations and treatment facilities that cannot tolerate long downtime.
Telecom base stations and remote sites
Generator auto-start and remote status monitoring for unattended sites.
Temporary power and exhibitions
Connection and transfer control for mobile or temporary generators.
Commercial terms
Specification dated September 2026; quotations follow this.
| Drawings & design | Free |
| MOQ | 1 unit (5 or more recommended for production) |
| Production lead time | 15-25 days after drawing approval |
| on-time delivery | 98% |
| Warranty | 12 months |
| Loading port | Ningbo / Shanghai, China |
| Component brands | Schneider / ABB / Siemens / Chint |
| Factory visit & dispatch confirmation | Factory visits welcome; finished-cabinet photos and video before dispatch |
| Capacity | 5,800+ units / year |
Documents for your engineering team
Selection manual, outline dimensions and RFQ checklist — for the customer's electrical engineer. All three documents are being organized by product line; download links go live once complete.
Six questions procurement and electrical engineers ask most
How long after utility power fails before the generator picks up the load?
Typically in the range of ten-plus seconds: after the auto-start command, the diesel engine starts and builds voltage and frequency in about 10 seconds, then the ATS transfers and picks up load in another 1–2 seconds. Actual timing depends on generator set capacity, starting performance, and ATS model. Loads sensitive to the transfer gap — servers, precision equipment — need a UPS to ride through this period.
Do you build paralleling cabinets?
Paralleling is a custom solution: it involves synchronization, load sharing, and protection logic across multiple generator sets, and must be designed individually based on generator parameters, distribution scheme, and control requirements. Please note this in your inquiry for such projects, and we will confirm the solution on a project basis. Standard single-unit auto-start plus ATS transfer is a standard product.
Why can't the generator shut down immediately after utility power returns?
When a diesel engine runs under load, the turbocharger gets very hot and needs several minutes of no-load running so the lubricating oil can carry the heat away before shutdown; otherwise the turbocharger bearings coke and fail. We build the cooldown run time into the logic, so no one has to remember it.
Can it work with fire loads?
Yes, configured to project requirements. Fire loads have specific rules for transfer time and reliability; please specify the control and acceptance requirements in your inquiry for the project, and we will match the solution to those requirements.
What does three-remote mean?
Telemetry reads data (voltage, current, frequency, power); status reads conditions (running, fault, utility-side or generator-side live); control sends commands (start, stop, transfer). All three signal groups can be wired to the duty room or a host system, which is useful for unattended sites.
Can an existing generator set work with a new cabinet?
In most cases, yes. Give us the generator brand and model, capacity, excitation method, and the interfaces on the existing control panel, and we will design the interface matching. If the original generator has its own control panel, the new cabinet can handle upper-level transfer and three-remote functions while the generator control panel stays in place for local protection.
Other cabinet types in the same main circuit
Related products use color-block placeholders for now (product photos not yet complete; they will be replaced together). Internal links will be filled in once live URLs are confirmed.
Want standby power to transfer successfully on the first try?
Send us the generator capacity, critical load list, and transfer requirements, and we will provide a free AMF solution and timing design · quotation within 24 hours. Direct from the source factory, MOQ 1 unit, 15–25 day delivery, 1-year warranty.
ISO 9001:2015 · CE(LVD+EMC) · CQC · IP65
When you write, include: single-line diagram or primary scheme, switch room layout, load list, and component brand requirements. You do not need complete drawings — capacity and cabinet type are enough to start.