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Eaton / Cutler-Hammer EC3090 Molded Case Circuit Breaker
- 90A
- 3 Pole
- Bolt-On
Eaton / Cutler-Hammer
EC3090
Molded Case Circuit Breaker
Brand
Eaton / Cutler-Hammer
SKU
EC3090
Quantity
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Eaton / Cutler-Hammer EC3090 - 90A 3 Pole Molded Case Circuit Breaker
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Description
Part of the legacy Westinghouse E-Frame family, this 90A Eaton Cutler-Hammer MCCB provides reliable power distribution for commercial and industrial facilities. It is specifically designed to mount into older CS5, MP40, MP100, MP200 panelboards, and EE switchboards. As an obsolete EC series unit, it can be substituted with the modern EHD3090. Rated for 10 kAIC at 240VAC, the breaker features fixed thermal-magnetic trip units and includes load-side lugs for immediate wire termination.Specifications
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Part Number | EC3090-R |
| Series | EC |
| Amperage | 90A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Cutler-Hammer CS5 Panelboards, MP40 Panelboards, MP100 Panelboards, MP200 Panelboards, EE Switchboards |
| Wire Gauge | 14-1/0 AWG (Cu/Al) |
| Max Wire | 1/0 AWG |
| Min Wire | 14 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | NEMA AB 1, UL 489 |
| Approval | UL |
| Temp Rating | 40°C |
| Construction Features | HACR Rated, Non-Interchangeable Trip |
Product FAQs
8 answersWhich legacy panelboards accept the EC3090 breaker?
This bolt-on breaker is specifically designed for installation in older Cutler-Hammer CS5, MP40, MP100, and MP200 panelboards, as well as EE switchboards.
What is the modern replacement for the obsolete EC3090?
The EC3090 is an obsolete EC series unit. It can be directly substituted with the modern EHD3090, which provides the same physical footprint but offers higher voltage and interrupting ratings.
What are the acceptable wire sizes for the EC3090 lugs?
The factory-installed load side lugs accommodate copper or aluminum (Cu/Al) wire ranging from 14 AWG to 1/0 AWG. Ensure proper torque specifications are followed during installation.
How does the thermal-magnetic trip unit operate on this breaker?
The fixed thermal-magnetic trip unit provides Long-Time (L) protection for sustained overloads and Instantaneous (I) protection for short circuits. Both the thermal and magnetic trip points are fixed and non-adjustable.
How does the EC3090 connect to the panelboard bus?
This is a bolt-on molded case circuit breaker. It secures directly to the panelboard bus using bolts, providing a rigid and reliable mechanical and electrical connection.
What is the ambient temperature rating for the EC3090?
This breaker is calibrated for a standard 40 degrees Celsius (104 degrees Fahrenheit) ambient temperature. Installing it in environments exceeding this temperature may require derating the breaker to prevent nuisance tripping.
What frame classification does the EC3090 fall under?
It belongs to the legacy Westinghouse E-Frame family of molded case circuit breakers. This frame size dictates its physical dimensions and mounting compatibility.
Can the EC3090 be used on 480V systems?
No, the EC3090 is strictly rated for a maximum of 240VAC with a 10kAIC interrupting capacity. For 480V applications, you must use a higher-rated breaker such as the EHD3090 replacement.
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