Eaton AA23A NEMA A200 Thermal Overload Relay | 3-Pole | 26.3–45A | Class 20

Eaton AA23A – NEMA A200 Thermal Overload Relay | 3-Pole | 26.3–45A | Class 20

The Eaton AA23A is a heavy-duty, ambient-compensated NEMA A200 Type A thermal overload relay engineered to protect three-phase industrial motors from damaging overload conditions. Covering a full-load current range of 26.3 to 45 amperes with Class 20 trip characteristics, the AA23A is the go-to choice for NEMA Size 2 motor starter applications.

Also known as the Cutler-Hammer AA23A, this relay mounts directly to Eaton Freedom Series NEMA contactors and features a built-in 1NC auxiliary contact for control circuit feedback and interlocking.

Key Specifications

• Part Number: AA23A
• Manufacturer: Eaton (Cutler-Hammer)
• Series: NEMA A200 / Freedom Series
• Relay Type: Thermal, Type A
• Trip Class: Class 20
• Poles: 3-Pole
• Full Load Current Range: 26.3–45A
• Auxiliary Contact: 1NC
• Mounting Type: Starter Mounted
• Ambient Compensation: Yes
• Voltage Rating: 600V AC
• Certifications: UL Listed, CSA Certified
• NEMA Size: 2

Why Choose the Eaton AA23A?

• Ambient Compensated: Accurate trip performance is maintained across varying installation temperatures — minimizing nuisance trips in warm enclosures or outdoor locations.
• Class 20 Trip Curve: Allows sufficient motor acceleration time while still protecting against sustained overload — ideal for pumps, fans, and compressors with longer ramp-up times.
• Direct Starter Mount: Clips directly onto Eaton NEMA A200 contactors for a compact, secure fit without additional hardware.
• 1NC Auxiliary Contact: Enables motor fault indication and PLC/control circuit integration for automated shutdown and alarm systems.
• Proven Eaton Reliability: Part of the trusted Freedom NEMA series, widely specified and used across industrial facilities worldwide.

Typical Applications

• NEMA Size 2 three-phase motor starters
• Pump motor protection (15–25 HP range)
• Centrifugal fan and blower control panels
• Air compressor motor starters
• Industrial HVAC and process equipment

Compatibility

The AA23A is designed for use with Eaton A200 NEMA Size 2 motor starters and Freedom Series contactors. It is a direct replacement for Cutler-Hammer Type A overload relays in 3-pole manual reset applications. For alarm contact functionality, see the AA23AB variant with Form C (1NC + 1NO) auxiliary contacts.