Overview
The LS GTK-22 thermal overload relay is a compact, bimetallic overload protection device designed for industrial motor control and automation circuits. This Class 10 model operates in the 0.25–0.4A range and features a 3-pole configuration with 1NO+1NC trip contacts. It provides differential current and phase-failure protection, making it suitable for demanding control applications in manufacturing, HVAC, and machinery automation.
Key Features
- Direct mount compatibility: Mounts directly on GM-9, 12, 18, and 22 contactors, or DIN rail with optional AZ-22H base
- Class 10 trip rating: Reliable thermal response for motor overload protection
- Compact design: 44 mm wide footprint for space-constrained control cabinets
- Trip-free mechanism: Prevents manual reset override when overload condition persists
- Differential current protection: Detects phase failure and current imbalance
- Ambient compensation: Operates reliably across –5 to +40 °C operating range
- Manual and automatic reset: Flexibility for different application requirements
Technical Specifications
- Current Rating (3 Pole): 0.25–0.4 A
- Trip Class: Class 10 (IEC 60947-4-1)
- Trip Contacts: 1NO + 1NC
- Mounting Options: Direct-mount on GM-22 contactor or DIN rail with AZ-22H base
- Physical Width: 44 mm
- Operating Temperature: –5 to +40 °C (ambient compensated)
- Protection Type: Differential current / Phase failure
- Reset Options: Manual / Automatic
- Mechanism: Bimetallic strip
Typical Applications
The GTK-22 is widely used in:
- Small motor protection (fan motors, pump motors, fractional HP applications)
- Industrial machine tool controls and automation systems
- HVAC and refrigeration unit motor circuits
- Conveyor and material handling equipment
- Control cabinets requiring compact overload relay solutions
Compatibility & Replacements
Compatible With
- GM-9, GM-12, GM-18, GM-22 contactors (direct mount)
- DIN rail mounting (with optional AZ-22H base)
- IEC 60947 control circuits and automation systems
- Three-phase motor protection systems
Replaces / Drop-In Replacement For
The LS GTK-22 in the 0.25–0.4A Class 10 rating is a direct replacement for equivalent GTK-22 overload relays with the same current and trip class specifications. Verify current rating and mounting compatibility before ordering to ensure proper system integration.
Works With
- LS Electric (LG Industrial Systems) motor starters and contactors
- Standard three-phase motor circuits (IEC and industrial standard)
- Manual and programmable logic control (PLC) motor protection schemes
- Phase failure and load monitoring systems
