Overview
The LS Electric GTK-22 thermal overload relay is a compact bimetallic protection device engineered for industrial motor control and circuit safeguarding. Designed for direct mounting on GM-9, 12, 18, and 22 ampere-rated contactors, the GTK-22 delivers reliable overload detection with minimal footprint. This lot of two relays provides redundancy and flexibility for multi-motor installations or equipment backup.
Key Features
- Bimetallic sensing element: Temperature-compensated design for stable trip characteristics from -5°C to +40°C ambient range
- Class 10 trip: Fast, repeatable thermal trip response meeting industrial protection standards
- Dual contacts: 1NO + 1NC trip contact configuration for versatile control logic integration
- Compact form factor: 44 mm wide profile fits tight DIN enclosures and contactor-mounted applications
- Trip-free mechanism: Prevents manual holding once overload condition is detected
- Manual and automatic reset: Field-selectable reset mode for diverse operational requirements
- Differential current protection: Detects phase imbalance and phase failure for GTK series models
Technical Specifications
| Manufacturer | LS Electric |
| Model | GTK-22 |
| Trip Class | Class 10 (IEC 60947-4-1) |
| Contact Configuration | 1NO + 1NC |
| Ambient Compensated Range | -5°C to +40°C |
| Physical Width | 44 mm |
| Mounting Options | Direct mount on GM-22 contactor; DIN rail with optional AZ-22H base |
| Sensing Type | Bimetallic |
| Reset Type | Manual/Automatic selectable |
| Protection Features | Overload, differential current, phase failure detection |
| Quantity per Lot | 2 units |
Typical Applications
- Three-phase AC motor protection in pumps, fans, and compressors
- Industrial machinery starter circuits requiring redundant overload protection
- HVAC and refrigeration compressor control panels
- Distribution centers and production line motor control
- Backup protection in dual-motor or multi-circuit installations
- Equipment retrofits where Class 10 thermal response is required
Compatibility & Replacements
Compatible With
- GM-9, GM-12, GM-18, GM-22 LS Electric contactors
- DIN rail mounting with optional AZ-22H base attachment
- Standard motor control centers using Class 10 overload relays
- Three-phase AC motor circuits rated for the selected ampere range
Replaces / Drop-In Replacement For
- Other GTK-22 overload relays (all ampere-range variants share identical mounting and contact footprint)
- Verify specific ampere rating (0.1A–22A range available) required for your circuit before ordering
Works With
- Mechanical relay logic and hardwired control systems
- Traditional starter-contactor-overload combinations
- Manual and automatic motor starters
- Industrial control panels requiring bimetallic overload sensing
- Phase-failure monitoring in three-phase motor applications
