Overview
The Cutler Hammer C306DN3 Series A1 is a three-pole thermal overload relay engineered for motor protection in industrial automation and machinery control. This proven device prevents thermal damage to motors and conductors by detecting and interrupting circuits during overload conditions or motor failure to start scenarios. Built as a plug-in replacement for Cutler-Hammer NEMA Size 00 and 0 starters, the C306DN3 combines reliability with ease of installation.
Key Features
- Three-pole thermal overload design with adjustable current settings
- 32-amp nominal rating with 0.254–38.5 motor FLA adjustability range
- Plug-in mounting for quick replacement and maintenance
- Auxiliary contacts (1NO–1NC) for signaling and interlocking
- RoHS-compliant construction
- Made in the USA with proven durability in industrial environments
Technical Specifications
| Part Number | C306DN3 |
| Series | A1 |
| Amperage Rating | 32 A nominal; 0.254–38.5 A adjustable range |
| Voltage Rating | 600 VAC |
| Poles | 3-pole |
| Mounting Style | Plug-in |
| Auxiliary Contacts | 1NO–1NC |
| NEMA Size Class | NEMA Size 00, 0 |
| IEC Size Class | IEC Size A–F |
| Dimensions | 4.25 × 3.5 × 2 inches |
| Weight | 1.8 lbs (approximately 370 grams) |
| Protection Type | Thermal Overload |
| Compliance | RoHS; IEC 947-4-1; EN 60947-4-1 |
| Manufacture | Made in USA |
Typical Applications
- Three-phase motor protection in pumping and compressed air systems
- Machine tool electrical control and overload safeguards
- HVAC equipment and fan motor circuits
- Industrial conveyor and material handling drives
- General machinery requiring thermal overload protection with signaling output
- OEM equipment requiring NEMA-standard starter compatibility
Compatibility & Replacements
Compatible With
- Cutler-Hammer NEMA Size 00 (AN16ANO) starters
- Cutler-Hammer NEMA Size 0 (AN16BNO) starters
- Cutler-Hammer non-reversing contactors: AE16, AE56, CE15, CE55 (A–F), AN16, AN56, CN15, CN55
- Cutler-Hammer A25 contactor (25–30 amp range)
- NEMA Standard 600 VAC motor control circuits
Replaces / Drop-In Replacement For
- Previous Cutler-Hammer C306DN3 units (direct replacement)
- Verify compatibility with your contactor model before ordering
Works With
- Cutler-Hammer C306TB1 terminal block accessories
- NEMA Size 00/0 motor starter enclosures
- Three-phase 600 VAC control systems
- Motor overload protection schemes requiring thermal-type devices
