Overview
The Allen-Bradley N34 is a Type N thermal overload relay heater element engineered for protective duty in motor control circuits. Rated for 12.8–15.9 A, the N34 delivers Class 20 protection and is compatible with Bulletin 709 motor starters and overload relay blocks. This compact, field-proven component is essential for maintaining motor circuit integrity in industrial automation, manufacturing, and process control applications where thermal overload protection is critical.
Key Features
- Current rating: 12.8–15.9 A nominal
- Class 20 thermal overload protection per NEMA standards
- Compatible with Bulletin 709 motor starters and overload relay assemblies
- Compact, plug-in design for quick installation and replacement
- Proven Allen-Bradley reliability in motor control circuits
- Ideal for general industrial applications and OEM motor starter builds
Technical Specifications
The N34 heater element is calibrated to provide time-delay overload protection aligned with NEMA Class 20 performance curves. The element’s thermal characteristics ensure coordination with associated control relays and motor winding protection. Selection of the correct heater element size is determined by the full-load amperage (FLA) of the motor being controlled; the relay rating at 40°C is 115% of the heater element’s rated FLA.
Typical Applications
- Motor Protection: Thermal overload safeguarding for three-phase and single-phase induction motors
- Magnetic Starters: Retrofit and replacement in older Bulletin 709 starter assemblies
- Manual/Automatic Control: Use in full-voltage and reduced-voltage starter circuits
- General Industrial: Manufacturing equipment, pumps, compressors, fans, and conveyor drives
- Maintenance & Repair: Drop-in replacement for worn or tripped heater elements
Compatibility & Replacements
Compatible With
- Bulletin 709 magnetic motor starters
- Allen-Bradley thermal overload relay blocks and assemblies
- NEMA-rated motor starter cabinets and control panels
- Three-phase and single-phase motor circuits rated 12.8–15.9 A
- Class 20 overload protection applications per NEMA standards
Replaces / Drop-In Replacement For
The N34 is a direct replacement for N Series Type N heater elements in Bulletin 709 overload relay assemblies. Verify compatibility with your system integrator before ordering if substituting in non-standard applications or systems with different ambient temperature requirements.
Works With
- Allen-Bradley motor starter lines using N-type heater cartridges
- Overload relay test blocks and auxiliary relay contacts
- Manual and mechanical control circuits requiring thermal time-delay
- Motor protection relays and electronic overload monitoring systems that reference thermal heater sizing tables
