LS Electric MT Thermal Overload Relay

The LS Electric MT Series Thermal Overload Relay is a bimetallic electromechanical motor protection device designed to protect three-phase induction motors from sustained overload current, phase imbalance, and single-phasing conditions in industrial control applications across Saudi Arabia. Available in current ranges from 0.1 A to 95 A with adjustable current setting dials, the MT relay mounts directly onto LS Electric MC series contactors (MT-12 through MT-95) or panel-mount independently via a DIN rail adapter, covering motor ratings from under 1 kW through to approximately 45 kW in direct mount configurations. Trip class is selectable (Class 10, 20, or 30) on most MT variants, allowing the relay to be matched to the motor starting duty — heavy-duty conveyor motors benefit from Class 20 or 30, while standard pump and fan motors are typically protected with Class 10.

The MT relay provides manual and automatic reset options, and includes a test button for periodic relay trip verification without removing the relay from service — an important maintenance feature in Saudi Arabia's facilities where regular preventive maintenance testing is mandated by industrial safety management systems. A trip indicator flag provides clear visual confirmation of relay operation, and the built-in auxiliary contacts (1 NO + 1 NC) connect directly into the motor control circuit for trip interlock and alarm signalling. Phase loss protection in the MT series uses differential current imbalance detection, which trips faster and more reliably under asymmetric phase loading than conventional single-element designs — particularly important in Saudi Arabia where voltage imbalance from single-phase loads on MV distribution networks is a known motor damage risk.

LS Electric MT overload relays are paired with MC contactors in virtually every LS Electric motor starter assembly in Saudi Arabia. Their direct-mount compatibility with the MC contactor range simplifies panel wiring and reduces assembly time compared to separate-panel-mount relay configurations. The MT relay's competitive SAR price — typically 30–40% below ABB TA-DN and Siemens 3RU2 equivalents at the same IEC rating — makes it the standard choice for cost-conscious Saudi panel builders who need reliable IEC 60947-4-1 compliant motor protection without premium European pricing.

Razz Middle East stocks the complete MT series range in Saudi Arabia, with same-day availability on common current ranges. We offer cross-reference support to identify the correct MT variant as a replacement for ABB, Siemens, or Schneider thermal overload relays currently in service at Saudi industrial facilities.