SQUARE D
SQUARE D 9065ST220 NEMA Overload Relay 1NC 15-45A
Solid-state overload relay protects three-phase motors from 15 A to 45 A with selectable Class 10 or 20 trip and remote reset
- Protects three-phase motors from overloads and phase loss with solid-state Motor Logic technology
- Adjustable 15 to 45 A current range covers NEMA size 2 starters with switch-selectable Class 10 or 20 trip
- Self-powered, ambient-insensitive design needs no external supply and includes visible trip indicator plus test function
- Rated for 600 V maximum voltage with 1NC contact for reliable control-circuit signalling
- UL listed and CSA certified for standalone or starter-mounted installation in industrial panels
Motor Logic overload relay for NEMA size 2 starters
This solid state overload relay is designed for Type S NEMA size 2 three-pole starters. It provides ambient-insensitive, self-powered protection for 50/60 Hz three-phase AC motors. The unit covers a full-load current range of 15 A to 45 A with a maximum voltage rating of 600 V. It mounts directly to the starter for integrated motor protection.
Sustained-load behaviour
The relay uses Motor Logic solid-state technology to monitor continuous motor current without thermal drift. Trip-free operation prevents restart until the overload condition clears, protecting the motor from repeated overheating cycles. Users can switch between Class 10 and Class 20 trip curves to match the application's acceleration profile. A visible trip indicator and built-in test function simplify diagnostics during extended runs.
Replaces thermal overload blocks on existing Type
This 9065ST220 unit serves as a direct replacement for older thermal overload relays on compatible NEMA size 2 starters. The upgrade is worthwhile when ambient temperatures vary, when phase-loss and phase-unbalance detection are required, or when electrical remote reset capability simplifies maintenance. It is not suited for single-phase motors, for starters outside the NEMA size 2 range, or for applications needing current settings below 15 A or above 45 A.
Highlights
- Protects three-phase motors from overloads and phase loss with solid-state Motor Logic technology
- Adjustable 15 to 45 A current range covers NEMA size 2 starters with switch-selectable Class 10 or 20 trip
- Self-powered, ambient-insensitive design needs no external supply and includes visible trip indicator plus test function
- Rated for 600 V maximum voltage with 1NC contact for reliable control-circuit signalling
- UL listed and CSA certified for standalone or starter-mounted installation in industrial panels
Specifications
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Questions about this item
How much heat does the 9065ST220 generate when it runs continuously at 45 A?
The solid-state Motor Logic relay is self-powered and ambient-insensitive, so it adds minimal heat inside the enclosure during all-day operation at its 45 A maximum.
What starter hardware must I already have to install this 15-45 A overload relay?
It mounts directly on a Type S NEMA size 2 three-pole starter, so that starter must be in place before the relay can be fitted.
Will the 9065ST220 coordinate with an older Type S size 2 contactor I want to keep?
Yes — the relay is designed for Type S NEMA size 2 three-pole starters, matching the contactor dimensions of 3.51 in tall, 4.28 in wide and 3.51 in deep.
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