Parameter | Details |
System Voltage | 12V |
Rated Output | 240A (160A at idle) to 275A (180A at idle); expandable to 320A in select models |
Maximum Speed | Continuous: 8,000 RPM; Intermittent: 10,000 RPM |
Rotation Direction | Clockwise |
Temperature Rating | 125°C / 257°F (for 240A & 275A models) |
Mount Type | PAD (Pad Mount) |
Polarity | Negative Ground |
Efficiency | Up to 72% (best-in-class) |
Weight | Approximately 14.1 kg / 31 lbs |
Stator Diameter | 152 mm / 5.98 in |
Overall Length | 252 mm / 9.92 in |
Remote Sense | Standard (reduces battery charge time by 50%) |
Regulator Type | Digital with advanced fault detection |
Key Features of the WB2445 40SI 12V 240A- 275A Heavy Duty Alternator
Brushless Design:
Eliminates brushes for reduced wear and contamination buildup. Airflow from rear to front enhances cooling, ensuring longevity in harsh conditions.
Improved Bearings and Seals:
Enhanced steel construction and sealing for superior durability, ideal for off-road and high-vibration applications.
Patented Hairpin Stator:
Delivers maximum power with minimal energy loss, optimizing torque and efficiency across RPM ranges.
High-Temperature Tolerance:
Operates reliably at elevated temperatures, with the housing acting as a heat sink.
Fuel Efficiency:
High efficiency reduces engine load, leading to fuel savings for fleet operators.
Easy Integration:
PAD mount and standard terminals (B+ 5/16", R/I #10) ensure quick installation and compatibility.
OEM 8600338 WB2445 Alternator Replacement Applications
The 40SI™ alternator, distributed by Elecdurauto, is ideal for heavy-duty vehicles, including:
Commercial trucks and tractors
School and transit buses (with high electrical demands like A/C or retarders)
Fire and emergency vehicles
Recreational vehicles (RVs) and coaches
Off-highway equipment (mining, construction)
WB2445 40SI Alternator Cross Reference & OEM Comparison
Elecdurauto stocks a comprehensive range of 40SI™ variants to meet diverse wholesale needs. All are 12V, PAD mount, with remote sense standard.
Part Number | Output | Status | Notes |
8600412 | 240A | Active | Private label, B+ 5/16", R/I #10 |
8600338 | 240A | Active | Lightweight design for fuel savings |
8600094 | 275A | Active | Suited for school buses with A/C or retarders |
8600478 | 275A | Active | Private label variant |
8600603 | 275A (estimated) | Active | High-output option |
8600781 | 275A | Active | Standard PAD configuration |
8600782 | 275A | Active | Similar to 8600781 |
8600783 | 275A | Active | Replacement available |
8600784 | 240A | Active | Cross-compatible with 240A group |
8600785 | 240A | Active | Replacement available |
Quality Standards & Testing for WB2445 Heavy Duty Alternator
Each alternator is manufactured to IATF 16949 standards and undergoes:
Dynamic performance testing at full load (24V/160A)
Vibration and heat endurance validation
Regulator response and over-voltage protection checks
Only products that pass 100% end-of-line testing are released for shipment.
![ISO 9001, ISO 14001, ISO 45001, IATF 16949 certified ignition coil manufacturer for OEM and aftermarket supply]()
Ideal for Heavy-Duty Fleets & Distributors
We support flexible wholesale models to help distributors and importers grow in their market:
Designed for fleet operators, OEM service networks, and aftermarket distributors
Longer lifecycle means fewer replacements and lower downtime
Consistent charging reduces ECU fault codes and battery replacement frequency
Supported by OEM-grade technical documentation and warranty
Why Choose Elecdurauto Heavy-Duty Alternators
At Elecdurauto, I focus on providing heavy-duty alternators that combine OEM-grade performance with business-driven advantages for global distributors, fleets, and aftermarket brands. Each alternator is designed for power, reliability, and profitability.
Factory-Level Engineering
Produced under the same standards as leading OE brands like
Delco Remy, Bosch, and Valeo, ensuring precise fitment, high efficiency, and long service life.
100% Quality Testing
Every alternator undergoes
vibration, durability, and full-load testing to guarantee stable output under the harshest operating conditions.
Broad Product Range
Comprehensive coverage across 12V and 24V alternators (100A–275A) for trucks, buses, construction, and marine applications.
Reliable Supply for B2B Buyers
Flexible capacity and
bulk inventory support ensure stable availability for distributors, fleet operators, and OEM customers.
Exclusive Product Advantage
Some alternator models are
market-exclusive, helping partners capture early opportunities in high-demand segments.
Fast Response
All inquiries receive a
reply within 24 hours, keeping your sourcing process quick and efficient.
Custom Development
Support for
rapid mold opening and new product design, ideal for customized alternator applications.
Competitive Pricing
Benefit from
low-cost new releases and
the most competitive prices on stocked models, helping your business maximize margins.
Expert After-Sales Support
Receive professional
technical guidance and installation support from experienced alternator engineers.
