LS MEC GTH-22/3 Thermal Overload Relay — 9–13 A Class 10 Motor Protection

Metasol Series · Direct-Mount to GMC Contactors · 3-Pole Bimetallic

The LS MEC GTH-22/3 is a three-pole bimetallic thermal overload relay with a current setting range of 9 to 13 A. It is part of the LS Electric (formerly LG Industrial Systems / LS MEC) Metasol series and is designed to mount directly under the matching GMC-22 contactor — a common configuration in motor starters for conveyors, fans, pumps, and small compressors. The "/3" in the part number denotes the 3-pole (three-heater) version, which is the standard for 3-phase motor protection in IEC / NEMA starter assemblies.

At koeed.com we list the GTH-22/3 (9–13 A) as a branch-circuit motor protection device. It is typically used to protect a 3-phase induction motor in the 4 kW to 5.5 kW range at 380–440 VAC, and the relay's auxiliary contacts (1 NO + 1 NC) are wired back to a PLC — most often a Mitsubishi MELSEC, Allen-Bradley MicroLogix, or Schneider Modicon — to flag a fault and stop the line.

Key Specifications

Datasheet Highlights

• 9–13 A setting range covers the most common 3-phase motor sizes in this class (~4 kW to 5.5 kW at 380–440 VAC), and the dial is calibrated in amps for direct field setting.
• Class 10 trip class is the IEC default for normal motor starting; if the motor is a heavy-start (high-inertia fan or crusher), consider a Class 20 / 30 equivalent.
• Ambient-compensated bimetal design reduces nuisance trips when the cabinet temperature rises, which is critical in un-conditioned plant rooms.
• Direct mount to LS GMC-22 contactor — no wiring kit needed, which keeps the panel-build labour to a minimum.
• 1 NO + 1 NC auxiliary block is enough to (a) drop out the contactor coil, and (b) flag the fault into a PLC input for operator display.
• Manual / Auto reset selector on the front face; Auto is required for unmanned panels, Manual is preferred for attended machinery where the operator must investigate the cause.

Typical Applications

• Conveyor & material-handling motors: 3-phase induction motors in the 4–5.5 kW range driving roller conveyors, chain conveyors, and slat conveyors, where the overload is the upstream protective device.
• Pump motors: centrifugal pumps in water-treatment skids, HVAC chilled-water loops, and irrigation boosters — bimetallic trip protects against dry-run / dead-head.
• Fan motors: supply / return fans in AHU cabinets, exhaust fans in paint shops, and large circulation fans in process cooling towers.
• Compressor motors: small reciprocating and scroll compressors on compressed-air systems, paired with an LS GMC-22 contactor and a Mitsubishi or Schneider soft-starter.
• Mixer & agitator motors: low- to mid-power mixers in food, paint, and chemical batch processes, where the trip class matches the moderate start-up duty.
• Packaging-line motor starters: form-fill-seal, labelling, and cartoning machines, where the GTH-22/3 is one of several overloads on a multi-motor panel.

Related Modules & Cross-Reference

Overload relays are always ordered in the context of the full motor starter — contactor, short-circuit protection, and PLC. KOEED can ship the GTH-22/3 as part of a matched starter kit:

Browse the KOEED contactors & motor protection and LS Electric / Metasol collections to bundle a full motor-starter kit.

Warranty & Authenticity

Each GTH-22/3 is supplied as a brand-new, factory-sealed LS Electric relay with lot code and date code recorded for full traceability. KOEED sources from authorised Korean and EU distribution, and counterfeits are rejected at incoming inspection. A 12-month limited warranty covers manufacturing defects; KOEED handles return shipping and replacement from local stock at no charge.

Cross-reference: GTH-22/3 9-13A · LS Electric Metasol thermal overload · 3-pole bimetallic · class 10 · motor protection · B2B industrial automation spares. KOEED Automation — independent distributor of industrial automation spare parts, including Allen-Bradley, Siemens, Mitsubishi, Omron, Schneider Electric, FANUC, Yaskawa, Panasonic, and Keyence.