Protection scope should be settled before price comparison. The buyer and supplier need the same understanding of generator breaker supply, short-circuit assumptions, neutral arrangement, and the devices handled by the site switchboard.
Yangzhou Tesla Power Equipment Co., Ltd. supplies diesel generator sets for export and project use. For this topic, the quotation is only useful when the purchaser states the site conditions, duty rating, voltage, frequency, enclosure preference, and any ATS or control interface requirements.
What buyers should know first
A diesel generator package may include a mounted breaker, control protection, and terminal connections, but upstream and downstream protection coordination depends on the project electrical design. The RFQ should separate supplier scope from site contractor scope.
| Item | Supplier usually needs | Buyer should verify |
|---|---|---|
| Main breaker | Rated current, pole count, trip type, enclosure position | Whether breaker is generator-mounted or in switchboard |
| Fault assumptions | Available short-circuit data and alternator notes | Protection study requirement from the consultant |
| Neutral arrangement | 3-pole or 4-pole switching, N-E bond approach | Local code and earthing system |
| Interface signals | Trip, alarm, remote start, status contacts | BMS or switchgear terminal list |
What to confirm before quotation
- Generator voltage, phase, frequency, duty rating, and rated current.
- Breaker type, breaking capacity requirement, and whether accessories are needed.
- Earthing system, neutral switching requirement, and cable entry direction.
- Remote emergency stop, common alarm, running signal, and trip indication requirements.
- Any protection coordination study or consultant specification to follow.
Where mistakes usually happen
The most expensive mistakes usually appear at the interface: the generator arrives without the expected breaker accessories, the neutral switching does not match the ATS, or the site expects protection settings that were never stated in the RFQ.
Documents to request
- Electrical single-line diagram
- Breaker and protection specification
- Earthing and neutral design note
- ATS or switchgear terminal list
- Factory acceptance test checklist
Related equipment and notes
For equipment selection, compare this requirement with the industrial diesel generator set and the wider diesel generator set product range. For planning context, also review earthing and neutral arrangement checks.
Common questions
Is the main breaker always included?
Not always. Some projects request a generator-mounted breaker, while others place protection inside the main switchboard. The RFQ should state the preferred scope.
Can the supplier complete the protection study?
The supplier can provide generator data, but final coordination often belongs to the project electrical designer or switchgear contractor.
Why does neutral switching matter?
Neutral switching affects earthing, ATS selection, and fault behavior. It should match the site electrical system and local requirements.
What should be checked in drawings?
Check breaker rating, cable entry, terminal numbers, remote signals, neutral links, and labels before approving production drawings.