Overview
The Allen-Bradley N18 thermal overload relay heater element is a compact eutectic alloy heater designed to protect motors and equipment in industrial control systems. Built to meet Class 20 protection standards, the N18 integrates into Bulletin 700 line starters and is suitable for use with thermal overload relays and magnetic motor starters. Although discontinued by the manufacturer, the N18 remains in demand for maintenance, troubleshooting, and replacement of legacy control systems.
Key Features
- Type N eutectic alloy construction for reliable thermal response and repeatability
- Class 20 overload protection suitable for industrial motor control applications
- Compatible with Bulletin 700 line starters and magnetic motor starter assemblies
- Rated for 2.88–2.97 amperes at Size 00–1
- Compact form factor; weighs only 0.05 lbs
- New in box condition ensures uncompromised performance
Technical Specifications
This heater element meets the performance and dimensional requirements of the original N18 specification for use in thermal overload relay units.
Typical Applications
- Motor starter protection in HVAC systems and industrial pumps
- Thermal overload relay replacement in legacy control cabinets
- Maintenance and retrofit of Bulletin 700 motor starters
- Three-phase and single-phase motor protection circuits
- General-purpose industrial automation systems
Compatibility & Replacements
Compatible With
- Bulletin 700 line starters and contactor assemblies
- Allen-Bradley thermal overload relay units (Type N)
- Magnetic motor starters (sizes 00–1)
- Legacy industrial control systems and motor control centers (MCCs)
Replaces / Drop-In Replacement For
- Original Allen-Bradley N18 heater elements in existing assemblies
- Verify compatibility with your system integrator or controls technician before ordering to ensure correct amperage rating and mounting configuration
Works With
- Rockwell Automation Bulletin 700 product line
- Thermal overload relay designs using eutectic alloy elements
- Manual and magnetic motor starters rated for industrial duty
