SQUARE D
SQUARE D 9065ST420 NEMA overload relay 45-135 A Trip Class 10/20 600V AC
NEMA overload relay protects three-phase motors from 45 A to 135 A with selectable Trip Class 10/20 at 600 V AC
- Protects motors from 45 A to 135 A with adjustable electronic overload
- Selectable Trip Class 10 or 20 matches application acceleration needs
- Rated for 600 V AC three-phase industrial power systems
- Direct contactor mounting on NEMA Size 4 starters simplifies panel assembly
- Single 1 NC auxiliary contact signals trip status to control circuits
Industrial motor protection relay
The SQUARE D 9065ST420 is a NEMA electronic overload relay built for three-phase motor circuits. It mounts directly to a compatible contactor and provides adjustable overload protection for industrial machinery applications.
Trip Class 10/20 thermal response
The relay operates with selectable Trip Class 10 or 20 characteristics to match motor starting profiles. It covers a current setting range from 45 A minimum to 135 A maximum at up to 600V AC and uses a manual reset after a trip event.
NEMA Size 4 direct-mount compatibility
This unit fits NEMA Size 4 contactors and works with Series 9065 Motor Logic solid-state overload relays. It includes a single normally-closed auxiliary contact and requires no separate thermal units for operation.
Highlights
- Protects motors from 45 A to 135 A with adjustable electronic overload
- Selectable Trip Class 10 or 20 matches application acceleration needs
- Rated for 600 V AC three-phase industrial power systems
- Direct contactor mounting on NEMA Size 4 starters simplifies panel assembly
- Single 1 NC auxiliary contact signals trip status to control circuits
Specifications
| Brand | SQUARE D |
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Questions about this item
How is the 9065ST420 overload relay installed and what step is commonly missed?
The relay mounts directly to a compatible NEMA Size 4 contactor; the step often missed is verifying the contactor series matches the Motor Logic solid-state overload relay series before mounting.
What maintenance or replacement will the 9065ST420 need over time?
The electronic overload protection uses no replaceable thermal units; maintenance is limited to periodic inspection of the 1NC auxiliary contact and manual reset function after a trip event.
What limit appears first when the 9065ST420 runs at 135 A continuously?
At the maximum 135 A setting the relay will trip according to the selected Trip Class 10 or 20 time-current curve, which is the first protective limit reached under sustained overcurrent.
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