Sample certificate · Contactor
Schneider TeSys LC1F780: test certificate
A real certificate from a recent major service on a contactor Schneider describes as not repairable. Customer name, site and references removed; every result as recorded.
- ContactorTeSys LC1F780 (LC1FDP780A)
- Rating780 A AC-3 · 1600 A AC-1
- Coil110/120 V
- ResultAll tests passed
Sample. Customer name, site address and customer references have been removed. All test results are exactly as recorded.
Contactor
| Manufacturer | Telemecanique (Schneider Electric) |
| Type | LC1-F780, TeSys F range |
| Catalog reference | LC1FDP780A |
| Rating | 780 A AC-3 (≤440 V), 1600 A AC-1 |
| Poles | 3 (3 NO) |
| Coil | 110/120 V, 40–400 Hz, sealed factory-calibrated coil module |
Coil and electrical tests
| Test | Test V | Reading | Result |
|---|---|---|---|
| Coil resistance A1–A2 | 10 A | 9.6 Ω | Pass |
| Coil IR to earth | 500 V DC | >1000 MΩ | Pass |
| Pick-up voltage | — | 90 V | Pass |
| Drop-out voltage | — | 65 V | Pass |
| Low-voltage operation (85%) | — | Operated at 93 V | Pass |
Main contact resistance and insulation
| Test | Test V | L1–T1 | L2–T2 | L3–T3 |
|---|---|---|---|---|
| Contact resistance, closed | 10 A DC | 0.073 mΩ | 0.071 mΩ | 0.057 mΩ |
| IR phase to earth, open | 500 V DC | >1000 MΩ | >1000 MΩ | >1000 MΩ |
| IR phase to phase, open | 500 V DC | L1/L2, L1/L3, L2/L3: all >1000 MΩ | ||
Inspection and functional tests
| Item | Result | Notes |
|---|---|---|
| Enclosure / housing | Pass | Cleaned; pole covers refitted |
| Main power terminals | Pass | Dressed contact assemblies fitted; terminals dressed and torque-checked |
| Visible arc damage | Pass | Arc-damaged pole carrier and burnt moving contacts removed, dressed and refitted |
| Overheating / discoloration | Pass | No residual signs after contact work |
| Corrosion | Pass | Surface rust removed from drive shafts and mechanism rails |
| Coil condition | Pass | Factory-sealed coil module, seal intact |
| Energize / de-energize | Pass | |
| Service operations | Pass | 30 electrical operations |
| Mechanical operation | Pass | 30 mechanical operations; movement smooth, not rubbing or catching |
Work completed
Major service. The contactor was stripped and inspected. One pole carrier showed severe arc damage; it was removed with its burnt moving contact assemblies, repaired and dressed, and moving contact assemblies were refitted across all three poles.
All main contacts were dressed and contact alignment and simultaneity checked. Surface rust was removed from the drive shafts and mechanism rails, and the mechanism cleaned, re-lubricated and proved free through repeated manual operation.
Defects found: no outstanding remedial work. Temperature at test: 20 °C. Completed and approved September 21, 2026.
Schneider's own guidance says TeSys F contactors can't be repaired, and the range has been obsolete since 2023. This certificate is why we disagree. LC1F contactor repair · Can an LC1F be repaired?
Send us the nameplate
A photo of the nameplate and the fault is enough for a first answer. We reply the same working day with a recommendation and a price for diagnosis and freight.