๐ง Product Overview
The Allen-Bradley 140G-N6H3-E12 is a 140G Series N-frame molded case circuit breaker with a 1200 A rated current and three poles. It uses an electronic LSI trip unit for long-time, short-time, and instantaneous overcurrent protection. Rockwell Automation identifies this version as an 80% rated breaker.
This model is intended for high-current industrial power distribution and circuit protection applications. The 140G platform is used in industrial switchgear, distribution equipment, motor control systems, and other electrical installations where high interrupting capacity and adjustable electronic protection are required.
The eBay item supplied for this listing is described as used, with a listed weight of approximately 12.8 kg and country of origin Italy.
๐ Technical Specifications
| Parameter | Specification |
|---|---|
| Brand | Allen-Bradley / Rockwell Automation |
| Model | 140G-N6H3-E12 |
| Series | 140G |
| Product Type | Molded Case Circuit Breaker |
| Frame Size | N Frame |
| Number of Poles | 3 Pole |
| Rated Current | 1200 A |
| Current Rating | 80% Rated |
| Protection | Electronic LSI |
| UL Interrupting Rating | 65 kA @ 480 V AC |
| Rated Frequency | 50/60 Hz |
| Insulation Voltage | Up to 1000 V per IEC configuration |
| Rated Impulse Withstand Voltage | 8 kV |
| Voltage Rating | Up to 690 V AC depending on applicable configuration/standard |
| Adjustment Type | LSI |
| Control Element | Toggle |
| Country of Origin | Italy |
| Condition | Used |
| Listed Weight | Approx. 12.8 kg |
Rockwell’s official product page confirms the 1200 A N-frame construction, three poles, electronic LSI protection, 80% rating, and 65 kA UL interrupting rating at 480 V.
โ๏ธ Key Features
- 1200 A high-current molded case circuit breaker
- 3-pole configuration
- N-frame 140G construction
- Electronic LSI protection
- Adjustable long-time protection
- Adjustable short-time protection
- High instantaneous protection
- 65 kA UL interrupting rating at 480 V
- 1000 V insulation-voltage class in the applicable IEC configuration
- 8 kV rated impulse withstand voltage
- Toggle-operated mechanism
- Suitable for high-current industrial distribution systems
The LSI electronic trip system provides adjustable long-time and short-time protection together with instantaneous protection. Rockwell documentation lists the 140G-N6H3-E12 within its N-frame 1200 A 140G breaker family.
๐ญ Typical Applications
The 140G-N6H3-E12 can be used in high-current electrical distribution and industrial power-control installations, including:
- Main distribution switchboards
- Industrial power distribution
- Motor control centers
- Large industrial machinery
- Factory electrical systems
- Marine and offshore electrical systems
- Generator and auxiliary power distribution
- Industrial MCC and switchgear assemblies
- High-current feeder protection
For an existing installation, the breaker should be selected based on the actual system voltage, prospective short-circuit current, conductor rating, protection coordination, and local electrical code.
๐ Installation & Configuration Notes
Before installing or replacing a 140G-N6H3-E12, verify the complete electrical configuration rather than matching the catalog number alone.
- Confirm the exact catalog number and Series.
- Verify the system operating voltage and frequency.
- Confirm the required continuous current rating.
- Check available short-circuit current at the installation point.
- Verify the 80% rating is suitable for the application.
- Confirm the electronic LSI trip settings.
- Check terminal and busbar compatibility.
- Verify required clearances and mounting arrangement.
- Confirm upstream/downstream protection coordination.
- Perform appropriate electrical testing before energizing.
Rockwell provides installation documentation for the 140G family under publication 140G-IN068.
โ ๏ธ Important Voltage Clarification
The numbers 690 V, 1000 V, and 8 kV should not be interpreted as three different operating-voltage ratings.
For this product family, the electrical specifications distinguish between operating voltage, insulation voltage, interrupting capacity, and impulse withstand voltage. Rockwell’s related 140G technical data identifies 1000 V as the IEC insulation-voltage level and 8 kV as the rated impulse withstand voltage.
๐ Inspection & Maintenance
For a used breaker, carefully inspect:
- Main terminals
- Busbar connection surfaces
- Toggle mechanism
- Trip-unit condition
- Housing for cracks or deformation
- Signs of overheating or arcing
- Terminal screws and hardware
- Identification label
- Pole condition
- Electrical accessories, if fitted
A suitable inspection should include mechanical operation and electrical testing appropriate to the installation. Trip settings should also be recorded before commissioning when the breaker is replacing an existing unit.
โ Frequently Asked Questions
Q: What is the current rating of the 140G-N6H3-E12?
A: The rated current is 1200 A. Rockwell identifies this specific catalog number as an 80%-rated N-frame breaker.
Q: How many poles does it have?
A: It is a 3-pole molded case circuit breaker.
Q: What type of trip protection does it use?
A: It uses electronic LSI protection, covering long-time, short-time, and instantaneous functions.
Q: Is it a 1000 V circuit breaker?
A: Not in the simple sense of a 1000 V operating rating. The 1000 V figure refers to the applicable insulation-voltage specification. The actual operating voltage must be checked against the relevant IEC/NEMA configuration.
Q: What is the interrupting rating?
A: Rockwell lists a UL interrupting rating of 65 kA at 480 V AC for this catalog number.
Q: Is 140G-N6H3-E12 the same as 140G-N6H3-E12-Z1?
A: No. They are closely related 1200 A N-frame versions, but the suffix indicates a different rating/configuration. Rockwell identifies the Z1 version as 100% rated, while the standard 140G-N6H3-E12 is 80% rated.
๐ฆ Related Allen-Bradley 140G Models
The following are related 140G models and should not be treated as automatic replacements:
- 140G-N6H3-E12 โ 1200 A, 3-pole, 80% rated
- 140G-N6H3-E12-Z1 โ 1200 A, 3-pole, 100% rated
- 140G-N6H3-E12-FB โ related 1200 A N-frame configuration
- 140G-N6H3-E12-Z1-SD โ related 100% rated configuration
- 140G-N6H3-E12-Z1-SD-FB โ related configuration with additional options
The suffixes can represent meaningful differences in rating, accessories, or configuration, so the complete catalog number should be matched before ordering.
๐ Identification & Ordering Notes
When purchasing a 140G-N6H3-E12, verify the physical nameplate for:
- Catalog number: 140G-N6H3-E12
- Series
- 1200 A rating
- 3-pole configuration
- Electronic LSI trip unit
- 80% rating
- Accessories or auxiliary contacts
- Terminal configuration
- Mechanical condition
- Any signs of previous electrical fault or overheating
For the supplied eBay listing, the item is described as Used, with Allen-Bradley as the brand, 140G-N6H3-E12 as the MPN, 690 V listed voltage, 50โ60 Hz frequency, 3 poles, Italy as country of origin, and approximately 12.8 kg listed weight.
Recommended Short eBay Title
ALLEN-BRADLEY 140G-N6H3-E12 | 1200A 3-Pole MCCB 690V
