Overview
The LS Electric GTK-22 thermal overload relay is a bimetallic thermal protection device rated for 12–18A operation. This compact relay delivers dependable overload and differential phase-failure protection in motor control and industrial automation circuits. It mounts directly on GM-9, 12, 18, and 22A LS contactors or can be mounted on DIN rail using the optional AZ-22H base.
Key Features
- Bimetallic thermal sensing element for proven, fast response
- Trip-free design ensures tripping even if the manual reset button is held
- Differential phase-failure protection to detect unbalanced three-phase conditions
- Manual and automatic reset options for flexible application requirements
- Compact 44 mm width fits tight control panel layouts
- Class 10A trip classification for standard industrial duty cycles
Technical Specifications
- Current Rating: 12–18A adjustable
- Thermal Class: Class 10A
- Auxiliary Contacts: 1NO + 1NC trip contacts
- Operating Temperature Range: −5 to +40°C ambient compensated
- Physical Width: 44 mm
- Reset Options: Manual and automatic available
- Mounting Method: Direct mount on GM-series contactors or DIN rail (with optional AZ-22H base)
- Protection Type: Differential current/phase failure detection
- Design Type: Bimetallic, trip-free
Typical Applications
- Three-phase motor overload protection in industrial automation
- Machine tool control circuits and CNC systems
- Process control and production equipment protection
- Pump, fan, and compressor motor circuits
- Material handling and conveyor systems
- HVAC and refrigeration motor control
Compatibility & Replacements
Compatible With
- LS Electric GM-9, GM-12, GM-18, GM-22 contactors (direct mount)
- LS Electric GM-series motor starters
- Industrial three-phase motor control circuits
- Standard 380–480V power systems
- DIN rail mounting with optional AZ-22H base
Replaces / Drop-In Replacement For
- GTK-22∙15 (standard 12–18A adjustable model)
- Verify compatibility with your system integrator before ordering for legacy or non-standard installations.
Works With
- LS Electric contactor assemblies and motor control centers
- Standard industrial control relays and switchgear
- Manual and semi-automatic motor starters
- Soft starter bypass circuits for motor protection coordination
