Overview
The Square D B50 thermal overload heater element is a melting-alloy thermal protection unit designed for motor control and overload relay applications. Supplied as a lot of 3 units, these heater elements provide Class 20 standard-trip protection with a motor full-load current range of 33.1–36 amps at 600V maximum. Each element plugs directly into Square D magnetic motor starters and separately mounted overload relays, making them ideal for maintenance and system upgrades without major rewiring.
Key Features
- Class 20 melting-alloy thermal trip mechanism for reliable overload protection
- Current rating: 33.1–36 amps; voltage rating: 600V AC maximum
- Plug-on mounting type compatible with NEMA Size 0 applications
- Manually resettable for quick system restart after thermal trip
- CE certified; suitable for AC/DC magnetic starters and motor controls
- Lot of 3 units provides bulk replacement capacity
Technical Specifications
Each Square D B50 element operates with a melting-alloy bimetal design that reliably trips when motor current exceeds the rated threshold. The standard Class 20 trip designation ensures predictable protection behavior in industrial environments. Manual reset capability allows technicians to restore operation quickly after a thermal event, reducing downtime in manufacturing and facility maintenance scenarios.
Typical Applications
- AC and DC magnetic motor starters
- Manual starter overload protection
- Separately mounted overload relay systems
- Industrial motor control centers and production equipment
- Facility maintenance and replacement stocking
Compatibility & Replacements
Compatible With
- Square D B-series thermal overload relays
- Square D NEMA Size 0 magnetic motor starters
- AC/DC magnetic starter systems
- Separately mounted thermal overload relays
Replaces / Drop-In Replacement For
The B50 thermal overload heater element is a direct replacement for existing B50 units in Square D motor control systems. Verify the current rating (33.1–36 amps) matches your application before ordering.
Works With
- Square D overload relay control circuits
- NEMA industrial motor control standards
- Class 20 thermal protection protocols
- Manual and automatic motor starter configurations
