Overview
The Sprecher + Schuh CT3-52 is a three-pole thermal overload relay engineered to provide precise motor protection in industrial and commercial applications. Rated for a current range of 40–52A at 600VAC, this solid-state overload device automatically interrupts the circuit when unsafe overcurrent conditions are detected, preventing motor damage and downtime. Its screw-terminal connection design ensures secure, reliable integration into motor starter panels and control systems.
Key Features
- 3-pole design ensures balanced protection across all three phases
- Adjustable current setting for precise motor protection tailored to application requirements
- Solid-state construction for reliable, repeatable trip performance
- Screw-terminal connections for secure mounting in control cabinets and starters
- Compact form factor designed for integration into standard motor control panels
- Durable construction suitable for long-term operation in industrial environments
Technical Specifications
- Current Range: 40–52A (adjustable)
- Voltage Rating: 600VAC
- Poles: 3-pole
- Connection Type: Screw terminals
- Configuration: Solid-state overload relay
- Dimensions: 3 7/8″ H × 2 3/4″ W × 2 1/4″ D
Typical Applications
The CT3-52 is commonly used to protect medium-range three-phase motors in:
- Industrial pump and fan motor circuits
- Conveyor and material handling systems
- Compressor and HVAC motor protection
- Manufacturing equipment and machine tool controls
- Motor starter assemblies in electrical distribution panels
Compatibility & Replacements
Compatible With
- Three-phase motor starters and contactor assemblies
- IEC-standard motor control circuits rated 600VAC
- Manual and automated motor starter panels
- Power distribution and motor protection schemes requiring 40–52A overload sensing
Replaces / Drop-In Replacement For
The CT3-52 replaces earlier versions of Sprecher + Schuh overload relays in the CT3 series within the 40–52A range, including variant models such as CT3-52-A through CT3-52-S. Always verify model number and rating before replacement.
Works With
- Standard 600VAC three-phase motor circuits
- Direct-online (DOL) starter configurations
- Reduced-voltage (soft-start) motor control schemes
- Power factor correction and harmonic filtering systems in industrial control panels
