Eaton / Cutler-Hammer NGH312039E Molded Case Circuit Breaker
- 1200A
- 3 Pole
- Bolt-On
Quantity
Eaton / Cutler-Hammer NGH312039E - 1200A 3 Pole Molded Case Circuit Breaker
New
Quantity
Description
Delivering advanced circuit protection, the Eaton NGH312039E is a 1200A molded case circuit breaker. It features a Digitrip 310+ unit with ALSIG functions and ground fault monitoring. This 3-pole breaker utilizes a bolt-on mounting style for installation in Eaton Series G panelboards and switchboards. It replaces the PDG53M1200E5NN. Operating as a standard 80% rated device, it achieves 65kAIC at 480V. The built-in Arcflash Reduction Maintenance System ensures enhanced workplace safety.Specifications
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Series | NGH |
| Amperage | 1200A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480VAC, 35kA @ 600VAC |
| Amperage Range | 600-1200A |
|---|
| Terminal Type | Stud/Tapped Pad |
|---|---|
| For Use With | Eaton Series G Panelboards, Switchboards, Motor Control Centers |
| Trip Technology | Electronic Trip |
|---|---|
| Trip Function Code | LSIG |
| Trip Function | Long-Time, Short-Time, Instantaneous, Ground Fault |
| Trip Adjustability | Adjustable |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Handle Mechanism, Lug Kits |
|---|---|
| Accessories | Lugs Not Included, Mounting Hardware |
| Standards | CSA C22.2 No. 5, HACR, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CE, CSA, HACR, IEC, UL |
| Temp Rating | -20C to 70C |
| Construction Features | 80% Rated, High Interrupting Capacity, HACR Rated, Reverse Feed, True RMS Sensing, Arcflash Reduction Maintenance System |
Product FAQs
6 answersWhat is the purpose of the ALSIG trip unit on the NGH312039E?
The ALSIG designation indicates this breaker features a Digitrip 310+ electronic trip unit with an Arcflash Reduction Maintenance System (ARMS), along with Long-Time, Short-Time, Instantaneous, and Ground-Fault protection. When activated during maintenance, ARMS reduces the fault clearing time, significantly lowering the available arc flash energy and improving personnel safety.
Which electrical distribution equipment is compatible with the NGH312039E?
This NG-frame breaker is designed for use in Eaton Series G panelboards, switchboards, and motor control centers. It is typically used for main and feeder protection in large three-phase commercial and industrial power distribution systems.
How are the line and load connections made on the NGH312039E?
This breaker features a bolt-on mounting style with stud and tapped pad terminals. It requires appropriate NG-frame mounting hardware and lugs to secure the conductors and ensure reliable electrical stability.
What is the Power Defense equivalent for the NGH312039E?
For modernization or replacement projects, the NGH312039E crosses over to the Eaton Power Defense PDG53M1200E5NN. Both are 1200A, 3-pole breakers that feature electronic trip units with an Arcflash Reduction Maintenance System.
Does the NGH312039E allow for selective coordination?
Yes, the Digitrip electronic trip unit is fully adjustable. Electricians can precisely tune the Long-Time, Short-Time, Instantaneous, and Ground-Fault (LSIG) settings to coordinate with downstream and upstream protective devices in the distribution system.
Is the NGH312039E rated for 80% or 100% continuous operation?
The NGH312039E is a standard 80% rated circuit breaker. Continuous loads should not exceed 80% of the 1200A nominal rating (960A) in accordance with standard National Electrical Code (NEC) sizing practices.
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