Overview
The Square D B56.0 is an overload relay thermal unit designed for use in NEMA magnetic motor starters and motor control applications. Built with melting alloy sensing technology and Standard Trip (Class 20) characteristics, the B56 provides dependable overload protection in industrial and commercial electrical systems. This plug-in thermal unit is rated for 600VAC and operates in ambient temperatures up to 40°C.
Key Features
- Melting alloy sensing method for precise thermal protection
- Standard Trip Class 20 motor tripping classification
- Plug-in mount design for quick installation and replacement
- 600VAC rated for industrial electrical applications
- 40°C ambient temperature rated
- Type B thermal unit compatible with Square D overload relays and magnetic starters
Technical Specifications
- Part Number: B56.0
- Manufacturer: Square D (Schneider Electric)
- Product Type: Thermal Overload Relay Unit
- Sensing Method: Melting Alloy
- Rating: 600VAC
- Trip Class: Class 20 / Standard Trip
- Current Range: 29.7–69.9A full load (dependent on specific configuration)
- Mounting: Plug-In
- Ambient Temperature: 40°C maximum
- Dimensions: 4.9 in L × 3.4 in W × 0.8 in H
- Relay Type: NEMA Overload Relay
Typical Applications
- Motor control and protection in magnetic motor starters
- Three-phase and single-phase motor circuit overload protection
- Industrial machinery and equipment protection
- Commercial HVAC and pump motor applications
- Manufacturing facility motor control systems
Compatibility & Replacements
Compatible With
- Square D magnetic motor starters (B-series and related lines)
- Square D overload relay assemblies
- NEMA standard motor control systems
- Manual and automatic motor starter applications
- Three-phase and single-phase AC motor circuits
Replaces / Drop-In Replacement For
The Square D B56.0 is a direct replacement for existing B56 thermal units in Square D overload relay assemblies. Verify compatibility with your specific motor starter model before ordering to ensure proper current rating and application match.
Works With
- Square D Class 8536, 8538, 8540, and similar magnetic motor starter series
- Melting alloy thermal overload relay systems
- Standard AC motor control circuits rated for 600VAC
- NEMA-compliant motor protection schemes
