Eaton / Cutler-Hammer LGMPS400G Motor Protection Circuit Breaker
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See full specsEaton / Cutler-Hammer LGMPS400G - 400A 3 Pole Motor Protection Circuit Breaker
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Description
Engineered for industrial motor control, the Eaton LGMPS400G is a 3-pole, 400A Series G motor protection circuit breaker. It delivers comprehensive overload and short-circuit defense. This unit-mount LG-frame device integrates into Eaton Pow-R-Line panelboards and switchboards, accepting 2 AWG to 500 kcmil wiring. Featuring a fixed thermal-magnetic trip unit, it ensures reliable LI protection. The breaker carries a 50kAIC rating at 480VAC with a current-limiting design.Specifications
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Part Number | LGMPS400G |
| Series | LG |
| Amperage | 400A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 85kA @ 240VAC, 50kA @ 480VAC, 25kA @ 600VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Eaton Pow-R-Line Panelboards, Motor Control Centers, Switchboards |
| Wire Gauge | (2) 2 AWG - 500 kcmil (Al/Cu) |
| Max Wire | 500 kcmil (x2) |
| Min Wire | 2 AWG (x2) |
| Trip Technology | Magnetic Only |
|---|---|
| Trip Function Code | I |
| Trip Function | Instantaneous Only |
| Trip Adjustability | Adjustable Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Line and Load Terminals |
| Standards | CSA C22.2 No. 5, IEC 60947-2, UL 489 |
| Approval | CE, CSA, IEC, KEMA, UL |
| Temp Rating | 40C |
| Construction Features | Motor Circuit Protector, HACR Rated, Current Limiting, Reverse Feed |
Product FAQs
5 answersDoes the LGMPS400G provide thermal overload protection for motor circuits?
No. As a magnetic-only motor circuit protector with an instantaneous trip function, it provides only short-circuit protection. It must be paired with a separate motor starter and overload relay to provide complete thermal protection for the motor.
What enclosures or panels are compatible with the LGMPS400G?
This LG-frame unit-mount breaker is designed for installation in Eaton Pow-R-Line panelboards, motor control centers, and switchboards. It requires bolt-on or panel mounting to a backpan and is not compatible with DIN rail systems.
Why does this breaker feature an adjustable magnetic trip unit?
The adjustable magnetic trip allows panel builders and electricians to precisely set the instantaneous trip threshold based on the specific starting inrush current of the connected motor. This ensures reliable short-circuit protection while preventing nuisance tripping during motor startup.
Can the LGMPS400G be used for general power distribution or as a main breaker?
No. Because it lacks a thermal trip element for standard overload protection, this motor circuit protector is strictly recognized for use in motor branch circuits. It cannot be used as a main breaker or for general lighting and power distribution.
Is there an alternate part number or alias for the LGMPS400G?
Yes, this Eaton Cutler-Hammer motor protection circuit breaker is sometimes referenced by the alternate manufacturer part number 69D4637G02.
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