Description
Description
Zeus 24V 4kW Low Turn On (LTO) 3.15 Alternator with Isolated Ground
The ARCO Zeus 24v 4kW LTO alternator turns on at lower RPMs, runs cooler, and provides more power than older designs that are larger and heavier. This alternator continuously generates over 1.4kW (51 Amps) at just under 1,500 RPM and almost 2.4kW (87 Amps) at 2,000 Alternator RPM. Put in real-world terms, a marine diesel engine idling at 750 RPM with a 2:1 pulley ratio is generating over 1.5kW (55 Amps), and a Mercedes Sprinter at 750 RPM with a 3.21:1 ratio is generating over 2.5kW (91 Amps)!
The ARCO Zeus 24v 4kW alternator turns on at lower RPMs, runs cooler, and provides more power than older designs that are larger and heavier. The newest generation of 24V performance has arrived.
Competitor’s 24V alternators utilize a 12V rotor and field current which is less efficient and limits output at all RPMs. ARCO utilizes a native 24V rotor and field current. This results in our 24V alternator running cooler than competitor’s 24V alternators, having a direct impact on the alternator lifespan.
Features:
- Engineered for high energy production.
- Suitable for marine, RV, military, and commercial applications.
- Rapidly charges large battery banks.
- Coolest operating temperatures for increased performance:
- Heat shedding coatings
- Rectifier located on housing exterior
- Dual cooling fans
- OEM components
- Optimized for performance at cruising speeds.
- Reduces the need for a generator by creating additional power with your engine.
- Unleash peak performance with E-Coat/Cerakote, keeping the high amp alternator cooler for sustained amperage output.
- Use the ARCO Zeus Bluetooth Alternator Regulator for maximum performance or lithium battery charging.
- SAE J1171 Certified.
- Proudly made in the U.S.A.
Specifications
Specifications
Identification
| MPN | 4401 |
|---|---|
| Barcode | 634707147500 |
General
| MPN | 4401 |
|---|---|
| Barcode | 634707147500 |
Electrical
| Output | 144A / 3,960W max (cold, 9,000 RPM @ 27.5V) / 130A / 3,575W sustained cruising (hot, 6,000 RPM) / 108A / 2,970W sustained idle (hot, 3,000 RPM) |
|---|---|
| Voltage | 24V (native 24V rotor & field) |
| Cut-In Speed | 1,072 alternator RPM |
| Max Alternator RPM | 19,000 |
| Regulator Type | External only (EX) — requires external regulator |
| Diodes | 6 positive / 6 negative, 50A rated, avalanche |
Physical
| Mount Type | 3.15" J180 saddle mount |
|---|---|
| Ground Type | Isolated ground |
| Stator/Frame | 138mm stator, large frame |
| Field Type | P-type field, native 24V |
| Pulley | 49mm K6 6-groove; 17mm dia. x 25mm shaft, M17x1.5 threaded |
| Battery Post | M8 threaded stud, side mount |
| Max Operating Temp | 100°C / 212°F |
| Finish | Black E-coating (Cerakote optional) |
Compatibility
| Fits | Yanmar marine diesel engines (various models) |
|---|
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* ALL WARRANTY IS THROUGH MANUFACTURE *

