Overview
The LS Electric MT-32/3K is a 3-pole thermal overload relay designed for motor protection in industrial control systems. Rated for 7-10A operation with Class 10A trip characteristics, this relay provides dependable overcurrent and phase loss protection. The MT-32/3K is part of LS Electric’s Metasol overload relay family, engineered to meet IEC 60947-4-1 and UL 508 standards for critical motor control applications.
Key Features
- Class 10A Trip Characteristic: Fast and reliable trip response to overload conditions, protecting motors from thermal damage.
- Phase Loss Sensitivity: Detects single-phase conditions and trips to prevent motor damage during phase failures.
- Contactor Integration: Direct mounting to MC-9b through MC-40a contactors for compact panel design and simplified wiring.
- Manual/Automatic Reset: Flexible reset options for manual intervention or automatic restart capability.
- International Approvals: CE, UL, and CCC certified with Type 2 coordination with MCCB and TOR devices.
Technical Specifications
- Configuration: 3-pole
- Current Range: 7-10A
- Trip Class: 10A (Class 10)
- Rated Operational Voltage [Ue]: 690V
- Rated Insulation Voltage [Ui]: 690V
- Rated Withstand Voltage [Uimp]: 6 kV
- Frequency Rating: 50/60 Hz
- Terminal Type: Screw clamp
- Operating Temperature Range: -5°C to +40°C
- Protection IP Rating: IP 20
- Standards Compliance: IEC 60947-4-1, IEC 60947-5-1, UL 508
- Certifications: CE, UL, CCC, KR, LR, BV, DNV, ABS, NK, RINA
- Heater Type: 3K (Differential 3-heater)
Typical Applications
The MT-32/3K thermal overload relay is widely used in:
- Motor control centers (MCCs) and control panels
- Industrial machinery and production line automation
- HVAC systems and ventilation control
- Pump and fan motor protection
- General-purpose motor starters
- Type 2 coordination systems with circuit breakers and motor control devices
Compatibility & Replacements
Compatible With
- LS Electric MC-series contactors (MC-9b through MC-40a)
- LS Electric UZ-32 auxiliary block assemblies
- Motor control centers using 690V rated protection devices
- IEC 60947-compliant motor starter systems
- Type 2 coordination motor control systems
Replaces / Drop-In Replacement For
Verify compatibility with your system integrator before ordering. The MT-32/3K is the 7-10A variant of the MT-32 series and is not a direct replacement for other current ranges or trip classes (such as 3D or 2H variants).
Works With
- LS Electric Metasol motor control product line
- Standard 3-pole motor starter configurations
- IEC 60947-4-1 compliant protection systems
- Industrial automation control platforms using motor protection relays
