Overview
The Allen-Bradley P33 heater element is a thermal overload protection component engineered for Bulletin 600 manual motor starters using Type P eutectic alloy relays. This Class 20 rated element trips at 8.24 full load amps and provides reliable motor protection in NEMA-standard industrial motor control circuits. The P33 is a direct replacement component for existing 600-line installations and delivers consistent thermal response across typical industrial temperature ranges.
Key Features
- Eutectic alloy construction for consistent, predictable thermal response
- Class 20 trip classification suitable for general-purpose motors
- Full load amp rating of 8.24 amperes
- Compatible with Bulletin 600 line starters and Type P overload relays
- Compact, sealed heater element design minimizes nuisance tripping
- NEMA/UL listed for industrial motor protection applications
Technical Specifications
- Heater element provides Class 20 overload protection
- Designed for use with Bulletin 600 manual motor starters
- Type P series thermal eutectic alloy element
- Rated for 8.24 amperes full load current
- Standard operating temperature range: industrial ambient conditions
- Complies with NEMA and UL 508 standards
Typical Applications
The P33 heater element is ideal for motor circuits requiring thermal overload protection in:
- General-purpose three-phase induction motors (5–15 HP range typical for 8.24 A)
- NEMA-compliant industrial motor control panels
- Manual motor starter installations in manufacturing and process control
- Maintenance and replacement applications in existing Bulletin 600 installations
- Motor branch circuits requiring Class 20 trip protection per NEC/CEC standards
Compatibility & Replacements
Compatible With
- Bulletin 600 manual motor starters (all sizes)
- Type P eutectic alloy overload relays
- NEMA-standard three-phase motor control circuits
- Standard industrial 480V and 240V motor branch circuits
- Manual starter assemblies requiring Class 20 overload protection
Replaces / Drop-In Replacement For
- Original Allen-Bradley P33 heater elements in Bulletin 600 installations
- Existing Type P eutectic alloy elements requiring replacement
- Field replacements in legacy motor control systems
Works With
- NEMA contactor and starter assemblies
- Manual motor starters (non-reversing and reversing types)
- Three-phase motor branch circuit protection
- UL 508 compliant motor control enclosures
