2-Pin 9.5mm Fuse Protector Connector OEM 7122-4123-30 / 7123-4123-30 – Doosan Daewoo Excavator DH55 / DH150 / DH220 / DH300
Direct OEM-specification replacement for the 2-pin 9.5mm high-current fuse protector connector used on Doosan and Daewoo excavator electrical harnesses. Cross-references Yazaki OEM numbers 7122-4123-30 (male housing) and 7123-4123-30 (female housing), also referenced as DJ7021Y-9.5-11/21. The 9.5mm pitch is designed for high-current fuse protection circuits — typically 30A–80A main power, starter, and hydraulic pump motor circuits on DH-series excavators. A corroded or heat-damaged fuse connector is a common cause of intermittent no-start and hydraulic system shutdown on Doosan equipment.
| OEM Number | Type | Application |
|---|---|---|
| 7122-4123-30 | Male housing (power supply side) | Doosan / Daewoo excavator fuse harness |
| 7123-4123-30 | Female housing (load side) | Doosan / Daewoo excavator fuse harness |
| DJ7021Y-9.5-11/21 | Alternate cross-reference (DJ series) | Heavy equipment fuse protection circuit |
| Pin | Function | Typical Wire Gauge | Failure Symptom if Open/Corroded |
|---|---|---|---|
| 1 | Battery / main power input (+12V or +24V) | 6–8 AWG (high current) | No-start; total electrical shutdown |
| 2 | Protected output to load (starter / pump motor) | 6–8 AWG (high current) | Starter inoperative; hydraulic pump no power |
| Attribute | Detail |
|---|---|
| Pin Count | 2-Pin |
| Terminal Pitch | 9.5mm (high-current series) |
| OEM Numbers | 7122-4123-30 / 7123-4123-30 / DJ7021Y-9.5-11/21 |
| Current Rating | Up to 80A per circuit (9.5mm terminal) |
| System Voltage | 12V / 24V compatible |
| Housing Material | High-temp PA66 nylon |
| Application | Fuse protector, main power, starter, hydraulic pump circuits |
| Compatible Equipment | Doosan / Daewoo DH-series excavators |
Q: My Doosan excavator won’t start — could it be the fuse connector?
A: Yes. A corroded or heat-damaged 2-pin 9.5mm fuse connector is a common cause of no-start on Doosan DH-series excavators. The high-current fuse circuit carries starter motor power — even partial corrosion on the 9.5mm terminal creates enough resistance to prevent the starter from drawing sufficient current. Inspect the connector for heat discoloration, melted housing, or green corrosion before replacing the starter motor or fuse.
Q: What is the difference between 7122-4123-30 and 7123-4123-30?
A: 7122-4123-30 is the male housing (power supply / battery side); 7123-4123-30 is the female housing (load / output side). Both are required for a complete connector repair. The -30 suffix denotes the Yazaki color/variant code for this application.
Q: Is this connector compatible with 24V excavator systems?
A: Yes. The 9.5mm Yazaki terminal is rated for both 12V and 24V systems. Doosan DH220 and DH300 series typically operate on 24V — this connector is compatible with both voltage systems.
Q: Are terminals included?
A: Yes, high-current 9.5mm terminals are included with all variants.
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