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3. Key Technical Specifications
| Parameter | Value |
|---|---|
| Contactor Type | Full Voltage Non-Reversing (FVNR) |
| Number of Poles | 3 |
| Frame Size | 27 mm (A-Frame) |
| Rated Operational Current (AC-3) | 12 A |
| Thermal Current (AC-1) | 20 A |
| Coil Voltage | 24 V DC |
| Maximum Voltage | 600 V AC |
| Horsepower Ratings (3-phase) | 3 HP @ 200/208 V & 230/240 V 5 HP @ 380/415 V 7.5 HP @ 460/480 V & 575/600 V |
| kW Ratings (approx.) | 3 kW @ 220/240 V 5.5 kW @ 380–575 V |
| Mounting | DIN rail or panel |
| Standards | IEC 60947-4-1, UL, CSA, CE |
| Width | 27 mm |
4. Product Introduction
The Eaton / Cutler-Hammer E111A12X3N is a 3-pole full-voltage non-reversing contactor from the IT. Electro-Mechanical Line. It is rated 12 A AC-3 and uses a 24 V DC coil, making it suitable for PLC or DC control circuits in industrial motor starters.
This 27 mm frame unit handles motors up to 7.5 HP at 460–600 V and is designed for frequent switching duty. It mounts on DIN rail or panel and remains a common spare for existing IT. Electro-Mechanical control panels even though the series has been discontinued by the manufacturer.
E111A12X3N
E111A12X3N
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 A1/A2 | Verify control power and wiring; replace if coil open |
| Contactor chatters or drops out | 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. 12 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 mechanical free movement | Replace contactor if contacts are welded |
| Coil burns out repeatedly | Overvoltage or wrong coil | ✅ High | Confirm supply is exactly 24 V DC | Use correct 24 V DC supply; replace contactor |
| Excessive noise | Loose parts or worn magnet | ❌ Low–Medium | Listen and inspect armature | Replace unit if noise persists after cleaning |
If the contactor fails to operate correctly with verified 24 V DC coil power and proper load, photograph the nameplate and terminal condition, then contact support with the application details.
6. Frequently Asked Questions (FAQ)
Q: Is the E111A12X3N still in production?
A: No. Eaton has discontinued the IT. Electro-Mechanical E111 series. Units available today are new surplus or refurbished. Stock is limited and lead times can vary.
Q: Can I replace this with a modern XT or other Eaton contactor?
A: In many cases yes, but you must match the current rating, coil voltage (24 V DC), physical size, and terminal layout. Verify mounting footprint and auxiliary contact requirements before substituting.
Q: What is the difference between this and an AC-coil contactor?
A: This unit has a 24 V DC coil. It is intended for DC control circuits (common with PLCs). Do not apply 24 V AC or any higher voltage to the coil.
Q: Does it include auxiliary contacts?
A: The base E111A12X3N is a 3-pole power contactor. Auxiliary contact blocks were available as accessories for the series. Check the existing installation for any side-mounted auxiliaries that may need to be transferred or reordered.
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 rather than current production cost. We test units for coil continuity, contact resistance, 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 12 A AC-3, and the physical mounting matches. Take clear photos of the existing contactor wiring and any auxiliary blocks before removal.
