Overview
The Sprecher & Schuh CT3-12 is a proven thermal overload relay engineered to protect electric motors from excessive current and overheating. With an adjustable 0.62–1.0A setting range and 600VAC maximum rating, this relay provides dependable overcurrent protection in motor starters, control panels, and integrated automation systems. The three-pole design ensures balanced protection across all phases, preventing damage from prolonged overcurrent conditions.
Key Features
- Adjustable setting range: 0.62–1.0A for precise motor sizing
- Rated for 600VAC maximum—suitable for single and three-phase applications
- Automatic trip at 120% of motor full-load current
- Three-pole configuration for balanced phase protection
- Ambient compensation for stable operation across temperature ranges
- Auxiliary contacts available for signaling and control integration
Technical Specifications
The CT3-12 meets industry standards for motor overload protection, featuring a compact design suitable for direct-mount and DIN-rail installation options (depending on variant).
Typical Applications
- Three-phase and single-phase motor starters
- Industrial motor control panels and enclosures
- Pump, fan, and compressor protection systems
- Machine tool and production equipment motor circuits
- HVAC and refrigeration motor protection
Compatibility & Replacements
Compatible With
- Standard IEC motor starter assemblies and contactor combinations
- Direct mounting on motor control relays and thermal units
- DIN-rail and panel-mount control systems
- Manual and automatic motor control circuits
Replaces / Drop-In Replacement For
Verify compatibility with your system integrator before ordering. The CT3-12 family includes multiple setting ranges (0.62–1.0A, 1.6–2.5A, 3.8–6A, 8.5–12.5A, etc.); confirm your specific variant matches the original equipment.
Works With
- IEC 660V / 600VAC motor starter systems
- Siemens, ABB, Schneider Electric, and similar contactor platforms
- Auxiliary contact circuits for alarm and status signals
- Thermal overload protection standards: IEC 947-4, BS 4941, VDE 0660
