LS Electric MR Series Multifunction Relay

The LS Electric MR Series Multifunction Relay is a versatile digital protection and control relay designed for motor protection, feeder protection, and general electrical protection applications in low-voltage switchgear panels and MCC cubicles across Saudi Arabia. The MR series encompasses a range of relay variants covering overcurrent protection (MR-OC), earth fault protection (MR-EF), voltage protection (MR-V), and combined motor protection (MR-MP) — providing system engineers with a consistent relay family that covers the full protection function set required in Saudi industrial LV switchgear from a single manufacturer. All MR relays include an LED front panel display showing measured values and relay status, with user-accessible parameter setting via front panel pushbuttons or RS-485 Modbus RTU communication — eliminating the need for a proprietary programming tool in most applications.

The MR motor protection relay (MR-MP) is the most comprehensive variant, providing thermal overload protection (ANSI 49), overcurrent protection (ANSI 51/50), earth fault protection (ANSI 50N/51N), negative sequence protection (ANSI 46), undercurrent protection (ANSI 37), and motor stall/locked rotor protection (ANSI 48/51LR) in a single relay — replacing a combination of separate overload relay, earth fault relay, and sequence relay that would otherwise occupy significantly more panel DIN rail space. The relay continuously measures and displays three-phase current, imbalance percentage, and thermal image state on the front panel, providing real-time motor protection status to operations staff without SCADA access in many routine monitoring situations.

In Saudi Arabia, digital multifunction protection relays are increasingly specified in industrial LV switchgear in place of traditional discrete protection relay combinations, driven by space savings, reduced wiring, and the enhanced protection function set available in digital relays. Saudi Aramco, SABIC, Ma'aden, and major cement group engineering standards all reference IEC 60255 digital relay requirements in LV switchgear specifications, and the LS Electric MR series meets these requirements with CE and KC certification. The MR relay's competitive SAR pricing — approximately 30% below equivalent ABB REX640 and Siemens SIPROTEC compact relays — makes digital motor protection economically viable in smaller Saudi industrial panels where premium European relay pricing would be difficult to justify.

Razz Middle East stocks the MR relay range and provides application engineering support for relay protection setting calculations, coordination studies, and Modbus communication configuration for integration into Saudi SCADA and condition monitoring systems.