{
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“mainEntity”: [
{
“@type”: “Question”,
“name”: “Common DILM Models for B2B Buyers”,
“acceptedAnswer”: {
“@type”: “Answer”,
“text”: “DILM7-10 (7 A, 3 main poles + 1 NO aux contact) – small motor starter (up to 4 kW at 400 V) DILM9-10 (9 A) – slightly larger motor loads (5.5 kW) DILM17-10 (17 A) – mid-range motor control (7.5 kW) DILM25-10 (25 A) – larger motors (11 kW) DILM40 , DILM50 , DILM65 – heavy industrial (up to 30 kW) DILM80 to DILM1700 – main contactor, capacitor switching, soft-starter bypass”
}
},
{
“@type”: “Question”,
“name”: “How to Choose a DILM Contactor”,
“acceptedAnswer”: {
“@type”: “Answer”,
“text”: “For a 3-phase motor starter, the most important spec is the AC-3 utilization rating — the rated current the contactor can switch under normal motor starting conditions. The Eaton DILM family is rated per IEC 60947-4-1, AC-3: DILM Model AC-3 (400 V) Rated Current Typical Motor Power DILM7-10 7 A 3 kW DILM9-10 9 A 4 kW DILM17-10 17 A 7.5 kW DILM25-10 25 A 11 kW DILM40 40 A 18.5 kW A common B2B rule of thumb: choose a DILM with AC-3 current ≥ 1.15× motor full-load current. This derating accounts fo…”
}
},
{
“@type”: “Question”,
“name”: “What EMR Relays Monitor”,
“acceptedAnswer”: {
“@type”: “Answer”,
“text”: “Phase sequence and phase loss Voltage monitoring (over / under / window) Current monitoring (over / under) Frequency monitoring (over / under) Power factor (cos phi) Thermistor protection (PTC)”
}
},
{
“@type”: “Question”,
“name”: “Typical Application”,
“acceptedAnswer”: {
“@type”: “Answer”,
“text”: “An EMR phase-sequence relay is one of the most common B2B requests. It protects three-phase motors from incorrect phase rotation (which can cause a motor to run in reverse, leading to mechanical damage in pumps, compressors, and conveyors). Eaton EMR phase-sequence relays are panel-mounted on DIN rail and provide a relay output that can be wired into the motor starter coil or the PLC.”
}
},
{
“@type”: “Question”,
“name”: “ETR-5000 Series Common Configurations”,
“acceptedAnswer”: {
“@type”: “Answer”,
“text”: “Model Key Specs Application ETR-5000B3IB0 8 inputs, 9 outputs, 5A/1A CT, Modbus-RTU+TCP, 40-250 Vac / 19-300 Vdc Standard transformer differential ETR-5000B1BA1 4 inputs, 6 outputs, 1A/1A CT Compact transformer feeder ETR-5000B2HB0 6 inputs, 8 outputs, 5A/1A CT, with harmonic blocking Industrial transformer with high THD”
}
},
{
“@type”: “Question”,
“name”: “How ETR Is Different From EMR”,
“acceptedAnswer”: {
“@type”: “Answer”,
“text”: “The ETR is a multi-function numerical protection relay , more comparable to a SEL or ABB REF615 than a simple monitoring relay. It supports ANSI / IEC protection functions such as: 87T – transformer differential 49 – thermal overload 50/51 – instantaneous / time-overcurrent 27/59 – under / overvoltage 81U/81O – under / overfrequency EMR relays, by contrast, are single-function devices used for simple monitoring and alarm.”
}
},
{
“@type”: “Question”,
“name”: “Recommended Bill of Materials”,
“acceptedAnswer”: {
“@type”: “Answer”,
“text”: “Contactor: DILM80 (DILM80-22) – 80 A AC-3, suitable for 37 kW at 400 V; the 22 suffix means 2 NO + 2 NC aux contacts for the control circuit. Overload relay: ZB150-150 – paired with DILM80, set to the motor nameplate FLC. Phase monitoring relay: EMR4-N100-1-B (or equivalent) – monitors phase sequence, phase loss, and over / undervoltage. Transformer protection: ETR-5000B3IB0 – mounted in the LV switchroom for the upstream 250 kVA transformer. Each device has a clearly defined role. The contactor…”
}
},
{
“@type”: “Question”,
“name”: “Can I use an EMR relay in place of a DILM contactor?”,
“acceptedAnswer”: {
“@type”: “Answer”,
“text”: “No. EMR relays are designed for monitoring and have a very low current switching output (typically 5 A or less). They cannot switch a motor contactor coil reliably, and they cannot switch motor power directly.”
}
},
{
“@type”: “Question”,
“name”: “Is the ETR-5000 compatible with IEC 61850?”,
“acceptedAnswer”: {
“@type”: “Answer”,
“text”: “The ETR-5000 series supports Modbus-RTU and Modbus-TCP. For IEC 61850 support, the Eaton PXR-EM or other relay families may be more appropriate.”
}
},
{
“@type”: “Question”,
“name”: “What coil voltage should I specify for DILM contactors?”,
“acceptedAnswer”: {
“@type”: “Answer”,
“text”: “The most common coil voltages for B2B panel builders are 24 Vdc, 110 Vac, 220 Vac, and 230 Vac. DILM catalog numbers with suffixes like /SP(24VDC) or /SP(230VAC) indicate the coil. For safety, 24 Vdc coils are increasingly preferred in modern panels.”
}
},
{
“@type”: “Question”,
“name”: “Do DILM contactors work with variable frequency drives?”,
“acceptedAnswer”: {
“@type”: “Answer”,
“text”: “Yes — but they should be installed downstream of the VFD output for bypass configurations (so the motor can be fed directly from the line if the VFD fails). The Eaton DILM is rated for AC-3 switching and is suitable for this duty.”
}
}
]
}
One of the most frequent questions we get from B2B buyers and panel builders is: “What is the difference between an Eaton DILM contactor, an Eaton EMR measuring relay, and an Eaton ETR protection relay?” They sound similar, they all live in the same control panel, and they all have screw terminals — but they do very different jobs.
This guide explains the role of each device, the typical applications, and how to choose the right one for your industrial project.
1. The Three Roles: Switching, Monitoring, Protecting
| Device | Primary Function | Where It Fits |
|---|---|---|
| DILM Contactor | Switching power on/off to a load (motor, heater, lighting) | Motor starter, lighting contactor, capacitor switching |
| EMR Measuring Relay | Monitoring an electrical quantity (current, voltage, frequency, phase) | Control panel, machine protection, alarm management |
| ETR Protection Relay | Protecting a specific piece of equipment (transformer, generator, motor) | Substation, transformer feeder, generator paralleling |
The simplest way to think about it: contactors switch, EMR relays monitor, ETR relays protect. They are complementary, not interchangeable.
2. Eaton DILM Contactors: The Workhorse
The Eaton DILM contactor is the most widely used contactor in IEC-style industrial control panels. Originally a Moeller product, the DILM family covers a 7 A to 1600 A range with a unified accessories platform.
Common DILM Models for B2B Buyers
- DILM7-10 (7 A, 3 main poles + 1 NO aux contact) – small motor starter (up to 4 kW at 400 V)
- DILM9-10 (9 A) – slightly larger motor loads (5.5 kW)
- DILM17-10 (17 A) – mid-range motor control (7.5 kW)
- DILM25-10 (25 A) – larger motors (11 kW)
- DILM40, DILM50, DILM65 – heavy industrial (up to 30 kW)
- DILM80 to DILM1700 – main contactor, capacitor switching, soft-starter bypass
How to Choose a DILM Contactor
For a 3-phase motor starter, the most important spec is the AC-3 utilization rating — the rated current the contactor can switch under normal motor starting conditions. The Eaton DILM family is rated per IEC 60947-4-1, AC-3:
| DILM Model | AC-3 (400 V) Rated Current | Typical Motor Power |
|---|---|---|
| DILM7-10 | 7 A | 3 kW |
| DILM9-10 | 9 A | 4 kW |
| DILM17-10 | 17 A | 7.5 kW |
| DILM25-10 | 25 A | 11 kW |
| DILM40 | 40 A | 18.5 kW |
A common B2B rule of thumb: choose a DILM with AC-3 current ≥ 1.15× motor full-load current. This derating accounts for the inrush during starting.
3. Eaton EMR Measuring Relays: The Watchdog
The Eaton EMR family is a range of multi-function measuring and monitoring relays. EMR relays do not switch power — they watch a single electrical quantity and trigger an alarm or trip signal when the value goes out of range.
What EMR Relays Monitor
- Phase sequence and phase loss
- Voltage monitoring (over / under / window)
- Current monitoring (over / under)
- Frequency monitoring (over / under)
- Power factor (cos phi)
- Thermistor protection (PTC)
Typical Application
An EMR phase-sequence relay is one of the most common B2B requests. It protects three-phase motors from incorrect phase rotation (which can cause a motor to run in reverse, leading to mechanical damage in pumps, compressors, and conveyors). Eaton EMR phase-sequence relays are panel-mounted on DIN rail and provide a relay output that can be wired into the motor starter coil or the PLC.
4. Eaton ETR Protection Relays: The Guardian
The Eaton ETR family — specifically the ETR-5000 — is a high-end transformer and generator protection relay. Unlike EMR relays that monitor a single quantity, the ETR integrates multiple protection functions in a single device, with optional Modbus-RTU and Modbus-TCP communication.
ETR-5000 Series Common Configurations
| Model | Key Specs | Application |
|---|---|---|
| ETR-5000B3IB0 | 8 inputs, 9 outputs, 5A/1A CT, Modbus-RTU+TCP, 40-250 Vac / 19-300 Vdc | Standard transformer differential |
| ETR-5000B1BA1 | 4 inputs, 6 outputs, 1A/1A CT | Compact transformer feeder |
| ETR-5000B2HB0 | 6 inputs, 8 outputs, 5A/1A CT, with harmonic blocking | Industrial transformer with high THD |
How ETR Is Different From EMR
The ETR is a multi-function numerical protection relay, more comparable to a SEL or ABB REF615 than a simple monitoring relay. It supports ANSI / IEC protection functions such as:
- 87T – transformer differential
- 49 – thermal overload
- 50/51 – instantaneous / time-overcurrent
- 27/59 – under / overvoltage
- 81U/81O – under / overfrequency
EMR relays, by contrast, are single-function devices used for simple monitoring and alarm.
5. Practical B2B Selection Example
Consider a B2B project: a 75 kW industrial pump motor on a 400 V system, fed from a 250 kVA transformer, with the requirement to monitor phase sequence, voltage window, and provide transformer differential protection.
Recommended Bill of Materials
- Contactor: DILM80 (DILM80-22) – 80 A AC-3, suitable for 37 kW at 400 V; the 22 suffix means 2 NO + 2 NC aux contacts for the control circuit.
- Overload relay: ZB150-150 – paired with DILM80, set to the motor nameplate FLC.
- Phase monitoring relay: EMR4-N100-1-B (or equivalent) – monitors phase sequence, phase loss, and over / undervoltage.
- Transformer protection: ETR-5000B3IB0 – mounted in the LV switchroom for the upstream 250 kVA transformer.
Each device has a clearly defined role. The contactor switches. The EMR relay monitors. The ETR relay protects.
6. Frequently Asked Questions
Can I use an EMR relay in place of a DILM contactor?
No. EMR relays are designed for monitoring and have a very low current switching output (typically 5 A or less). They cannot switch a motor contactor coil reliably, and they cannot switch motor power directly.
Is the ETR-5000 compatible with IEC 61850?
The ETR-5000 series supports Modbus-RTU and Modbus-TCP. For IEC 61850 support, the Eaton PXR-EM or other relay families may be more appropriate.
What coil voltage should I specify for DILM contactors?
The most common coil voltages for B2B panel builders are 24 Vdc, 110 Vac, 220 Vac, and 230 Vac. DILM catalog numbers with suffixes like /SP(24VDC) or /SP(230VAC) indicate the coil. For safety, 24 Vdc coils are increasingly preferred in modern panels.
Do DILM contactors work with variable frequency drives?
Yes — but they should be installed downstream of the VFD output for bypass configurations (so the motor can be fed directly from the line if the VFD fails). The Eaton DILM is rated for AC-3 switching and is suitable for this duty.
Conclusion
Understanding the difference between Eaton DILM contactors, EMR measuring relays, and ETR protection relays is essential for any B2B project involving motor control or transformer protection. Choosing the right device for the right job ensures reliable operation, easier maintenance, and code-compliant switchgear.
For project quotations, technical datasheets, or B2B volume pricing on the full Eaton contactor and relay portfolio, contact our team or browse the DILM contactor, EMR relay, and ETR protection relay product lines.