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3. Key Technical Specifications
| Parameter | Value |
|---|---|
| Contactor Type | Full Voltage Reversing (FVR) |
| Number of Poles | 3 |
| Frame Size | 27 mm (A-Frame) |
| Rated Operational Current (AC-3) | 9 A |
| Thermal Current (AC-1) | 16 A |
| Coil Voltage | 24 V DC |
| Maximum Voltage | 600 V AC |
| Horsepower Ratings (3-phase) | Approx. 2 HP @ 200/208–230/240 V 3–5 HP @ 380–600 V |
| Construction | Factory-assembled with mechanical interlock |
| Mounting | DIN rail or panel |
| Standards | IEC 60947-4-1, UL, CSA, CE |
| Width | 27 mm |
4. Product Introduction
The Eaton / Cutler-Hammer E511A09X3N is a 3-pole full-voltage reversing contactor from the IT. Electro-Mechanical Line. It is rated 9 A AC-3 and uses a 24 V DC coil, making it suitable for PLC or DC control circuits that require forward/reverse motor control.
This 27 mm A-frame unit is factory-assembled with a mechanical interlock and is designed for frequent reversing duty on small motors. It remains a common spare for existing IT. Electro-Mechanical panels even though the series has been discontinued.
5. Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| Contactor will not pick up | No coil voltage or open coil | ✅ High | Measure 24 V DC at coil terminals | Verify control power and wiring; replace if coil open |
| Both directions try to energize | Failed mechanical interlock or wiring error | ✅ High | Check interlock operation and control logic | Do not operate until interlock is verified |
| Contactor chatters | Low coil voltage or poor connection | ✅ High | Check voltage under load; inspect terminals | Correct voltage drop; clean/tighten connections |
| Contacts weld or overheat | Overload or high inrush beyond rating | ✅ Medium | Verify motor FLA vs. 9 A AC-3 rating | Confirm proper overload relay and application |
| Will not drop out | Residual magnetism or welded contacts | ✅ Medium | Remove coil power and check free movement | Replace contactor if contacts are welded |
| Excessive noise or binding | Worn interlock or armature | ✅ Medium | Inspect mechanical interlock and magnet assembly | Replace unit if binding persists |
If the contactor fails to operate correctly with verified 24 V DC coil power and proper load, photograph the nameplate, interlock, and terminal condition, then contact support with the application details.
E511A09X3N
E511A09X3N
6. Frequently Asked Questions (FAQ)
Q: Is the E511A09X3N still in production?
A: No. Eaton has discontinued the IT. Electro-Mechanical E511 series. Units available today are new surplus or refurbished. Stock is limited.
Q: What is the difference between E511 and E111?
A: E111 is the non-reversing (FVNR) version. E511 is the reversing (FVR) version with factory-installed mechanical interlock and dual contact blocks.
Q: Can I replace this with a modern XT reversing contactor?
A: In many cases yes, but you must match the current rating (9 A AC-3), coil voltage (24 V DC), physical size, and terminal layout. Verify mounting footprint and interlock requirements before substituting.
Q: Does it include auxiliary contacts?
A: The base unit is a 3-pole reversing power contactor. Auxiliary contact blocks were available as accessories for the series. Check the existing installation for any side-mounted auxiliaries.
Q: What overload relay works with this contactor?
A: It was designed for use with Eaton IT. Electro-Mechanical overload relays of the matching frame size. Confirm the specific overload model previously used in the starter.
Q: Why is a surplus unit less expensive than a new modern equivalent?
A: This is a discontinued part. Pricing reflects secondary-market availability. We test units for coil continuity, contact resistance, interlock function, and mechanical operation and provide our own limited warranty.
Q: What should I verify before installing a replacement?
A: Confirm coil voltage is 24 V DC, motor full-load current is within 9 A AC-3, and the physical mounting and interlock arrangement match. Take clear photos of the existing contactor wiring and interlock before removal.
