Overview
The Allen-Bradley N18 thermal overload relay heater element is a Type N eutectic alloy protection device designed for use with Bulletin 700 line motor starters and magnetic contactors. This N18 overload heater delivers Class 20 thermal protection, making it essential for legacy and ongoing industrial automation applications where motor overload monitoring is critical.
Key Features
- Type N eutectic alloy construction for reliable thermal sensing
- Class 20 overload protection rating
- Rated for 2.88–2.97 amperes maximum current (size 00–1)
- Compatible with Bulletin 700 line starters and motor controls
- Lightweight and compact form factor (0.05 lbs)
- Discontinued by manufacturer; remaining stock highly sought
Technical Specifications
- Current Rating: 2.88–2.97 amps @ size 00–1
- Type: Type N eutectic alloy thermal heater
- Protection Class: Class 20
- Series: N series
- Product Line: Bulletin 700 starters
- Weight: 0.05 lbs
- Condition: New in box
Typical Applications
- Thermal motor overload protection in legacy industrial motor starters
- Magnetic contactor and motor control systems requiring Class 20 rated protection
- Equipment refurbishment and retrofit where original N18 units are specified
- Plant maintenance where replacement heater elements are stocked for rapid downtime reduction
- Heavy-duty machinery control circuits across manufacturing, HVAC, and process industries
Compatibility & Replacements
Compatible With
- Bulletin 700 line starters and motor controls (Allen-Bradley)
- Thermal overload relay applications using Type N eutectic alloy heaters
- Magnetic motor starters requiring Class 20 protection
- Legacy industrial automation systems from the 1970s–2010s era
Replaces / Drop-In Replacement For
- Original equipment N18 heater elements in Bulletin 700 starters
- Any equivalent N series Type N eutectic alloy heater rated for 2.88–2.97 amps
Works With
- Allen-Bradley Bulletin 700 contactors and starters
- Manual and magnetic motor starter assemblies
- Thermal overload relay modules requiring N-type heater elements
- Industrial motor control and automation ecosystems from the classic automation era
