Delco Remy 40SI Brushless Alternator | Performance Curve

As one of the leading brushless alternators in the industry, the 40SI is at the top of the class in output performance and efficiency. The 40SI provides superior output performance at low RPM and at road speed.
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Delco Remy starters and alternators are the preferred choice for medium and heavy-duty truck, bus and off-highway applications worldwide. Learn more at delcoremy.com.
DELCO REMY is a registered trademark of General Motors LLC, licensed to PHINIA Technologies Inc.
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The 40SI is a durable brushless model available in output ranging from 240 to 320 Amps. Its efficiency rating is best-in-class. High efficiency translates to less engine horsepower requirements, resulting in substantial fuel savings.
The Delco Remy 40SI High Output Alternator is ideal for a number of applications that carry heavy electrical loads including:
- School buses
- Line-haul commercial trucks with anti-idling equipment
- Emergency vehicles
- Refuse trucks
- Utility vehicles
- Shuttle buses
- Recreational vehicles
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