Eaton / Cutler-Hammer LGH340033W Molded Case Circuit Breaker
- 400A
- 3 Pole
- Unit Mount
Quantity
Eaton / Cutler-Hammer LGH340033W - 400A 3 Pole Molded Case Circuit Breaker
New
Quantity
Description
Engineered for commercial and industrial applications, the Eaton LGH340033W is a 3-pole, 400A molded case circuit breaker from the Series G LG-frame lineup. It installs into compatible Eaton panelboards, switchboards, and motor control centers to deliver reliable power distribution. This unit features an advanced Digitrip 310+ electronic trip unit with adjustable LS (Long-Time, Short-Time) functions and true RMS sensing. Rated at 65 kAIC at 480VAC. Lugs are not included.Specifications
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Part Number | LGH340033W |
| Series | LGH |
| Amperage | 400A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480VAC, 35kA @ 600VAC |
| Amperage Range | 160-400A |
|---|
| Frame Type | LG |
|---|---|
| Terminal Type | Lugs |
| For Use With | Eaton Series G Panelboards, Switchboards, Motor Control Centers |
| Trip Technology | Electronic Trip |
|---|---|
| Trip Function Code | LS |
| Trip Function | Long-Time, Short-Time |
| Trip Adjustability | Adjustable |
| Available Options | Auxiliary Switch, Shunt Trip, Undervoltage Release, Alarm Switch, Handle Mechanism, Motor Operator, Lug Kits |
|---|---|
| Accessories | Lugs Not Included, Mounting Hardware |
| Standards | CSA C22.2 No. 5, HACR, IEC 60947-2, UL 489 |
| Approval | CE, CSA, IEC, KEMA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, High Interrupting Capacity, Current Limiting, True RMS Sensing, 80% Rated |
Product FAQs
10 answersWhat trip functions are adjustable on the LGH340033W?
This breaker is equipped with a Digitrip 310+ electronic trip unit featuring adjustable Long-Time and Short-Time (LS) pickup and delay settings for precise system coordination.
Is the 400A rating on the LGH340033W fixed or adjustable?
While the maximum continuous frame rating is 400A, the electronic trip unit allows the Long-Time pickup to be adjusted downward, enabling electricians to match the breaker's protection level to the specific ampacity of the connected conductors.
What is the purpose of the Short-Time trip function on this breaker?
The Short-Time (S) function allows for a delayed trip during moderate fault conditions. This delay enables downstream breakers closer to the fault to trip first, improving selective coordination and minimizing system downtime.
What type of enclosures accept the LGH340033W circuit breaker?
It is compatible with Eaton Series G panelboards, switchboards, and motor control centers designed to accommodate LG-frame breakers.
How is the LGH340033W installed in an electrical system?
It utilizes a unit-mount, feed-thru configuration. This means it bolts directly to the enclosure backpan and connects to the bus or cables via terminals, rather than plugging into a busbar.
Does the LGH340033W replace older Cutler-Hammer LG-frame breakers?
Yes, Eaton and Cutler-Hammer are the same brand. This Series G breaker can replace older Cutler-Hammer LGH breakers with matching specifications in existing installations.
What does the "H" in the LGH340033W catalog number indicate?
In the Eaton Series G nomenclature, the "H" designates the specific interrupting capacity tier of the LG frame. For this model, it indicates a rating of 65kAIC at 480VAC.
How does the solid-state trip unit improve safety compared to thermal-magnetic breakers?
The electronic Digitrip 310+ unit provides highly accurate, repeatable trip curves that do not drift with ambient temperature changes, ensuring reliable protection for sensitive downstream equipment.
Can this 3-pole LG-frame breaker be used in a 2-pole application?
Yes, when applying this 3-pole molded case circuit breaker in a 2-pole or single-phase system, Eaton specifies wiring the two outer poles.
Does this breaker provide neutral protection for 3-phase, 4-wire systems?
No, the LGH340033W is a standard 3-pole breaker and does not include neutral protection. Systems requiring integrated neutral protection must use a 4-pole LG-frame variant.
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