I. Model and Aliases

Main Model: R8T30171

OEM Part Number: ME049233 (Mitsubishi Original Part Number)

Common Names: 24V Safety Relay, Starter Protection Relay, Voltage Regulation Relay

II. Key Specifications

Coil Voltage: DC 24V

Functions: Starter Control + Overvoltage Protection + Delayed Power-off (Safety Circuit)

Terminals: 3-Pin Waterproof Connector (Power / Ground / Control)

Structure: Metal Shielded Housing, Flange Mount, Vibration-resistant and Dustproof

Operating Temperature: -40°C to +85°C

Weight: Approx. 1.5 kg

III. Compatible Models (Mitsubishi / Kato / Kobelco)

Mitsubishi Engines: 6D15, 6D15-T, 6D22, 6D22-T, 6D22-TC, S6K, etc.

Kato Excavators: HD820, HD820-2, HD820-3, HD1023, etc.

Kobelco Excavators: SK200-6, SK200-6E, SK220L, SK230, etc.

Others: Caterpillar E320B / E320C / E312C (Universal Replacement)

IV. Functions and Failure Symptoms

Core Functions:

Key Switch → Relay → Starter: Controls the starting circuit

Overvoltage Protection: Prevents alternator voltage from becoming excessively high, thereby protecting electrical components from burnout

Safety Interlock: Inhibits starting if the transmission is not in neutral or if the safety switch is not engaged

Common Failure Symptoms:

No response when turning the key; starter fails to engage

Intermittent starting failures; dashboard indicator lights illuminate, but the engine fails to start

Excessively high alternator voltage (>28V); resulting in burnt-out bulbs or damaged ECU/control boards

Relay housing becomes hot to the touch; signs of internal burnout or damage

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