I. Core Specifications

Model: 544-00007 (54400007)

Voltage: DC 24V (Standard for excavators)

Contact Capacity: 80–100A / 24VDC (Controls the starter motor)

Coil Power Consumption: Approx. 15W

Terminals: 2 x M8 Main Terminals (for heavy-gauge cables) + 1 x Waterproof Connector (for coil control)

Structure: Electromagnetic type, Normally Open contacts, Metal housing, Vibration-resistant

Function: Connects high-current power to the starter motor during key-start operation; protects the ignition switch and wiring harness

Operating Temperature: -40°C to +85°C (Suitable for the harsh environments of heavy machinery)

II. Applicable Models (Doosan / Daewoo Excavators)

DX Series: DX140W, DX180, DX225LC, DX225NLC, DX190W, DX210W

DH Series: DH220-5, DH280

Wheel Loaders: DL200, DL250, DL300, DL400, DL500

III. Symptoms of Failure

No response when turning the key; starter motor fails to rotate

Only a single "click" sound is heard during startup; motor fails to engage

Main terminals show signs of pitting/burning or excessive heat generation

Ignition switch is prone to burning out (due to excessive current flow resulting from relay failure)