KA Series Transit Alternators


Drop-in replacements for EMP Power 450 and 535 alternators as well as the Delco Remy 50DN and 50DN+ alternators.

Starting, Charging and Electrical

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KA500 Series

Features & Benefits

  • Low Maintenance: Brushless alternators, like the EMP 450 and KA500, will never have broken, worn-out, or stuck brushes, corroded or shorted slip rings, broken bush springs or shunts, or grounded rotor coils.
  • High Efficiency: These power alternators operate at a peak efficiency of 82%, meaning they use less horsepower and consume less fuel.
  • Durable: The simple yet effective design of these alternators means they can last longer, even in harsh conditions.
  • High Output: When the engine is idle (or at 2,000 RPM), the KA500 and EMP 450 output 290 amps.
  • Less Electrical Noise: These alternators feature just one return ground path to the alternator, reducing electrical noise in the engine’s grounding circuit. It also features integrated noise compression, which reduces AC noise from the DC circuit.
  • 4-Inch Rear Air Inlet Duct: The EMP 450 and KA500 feature a four-inch air inlet duct on the rear, which helps increase the lifespan of the alternator.

KIRK's new line of KA500 high-output alternators are drop-in replacements for both the Delco Remy 50DN and EMP Power450 alternators. KIRKS KA series alternators are 100% manuafactured in Detroit, MI at KIRKS headquarters and meet FTA Buy America requirements.

— Specifications (for all KA500 units)

Air-Cooled, 12 Phase Alternator
450A @ 5000 RPM
Brushless Design
Operational Speed: 1800 – 6500 RPM
Intermittent Speed: 8000 RPM
Turn on Speed: 1250 RPM
Rotation: CW or CCW
Ambient Temp Range: -40 to 95C
Storage Temp: -40 to 95C
Weight: 100 lbs.
Mounting: Pad, Radius
Polarity: Negative Ground
Voltage Regulation: Standard 50DN
Drop In Replacement for Remy 50DN and EMP Power450
Options Part Number
KA500 – Standard, 3″ Inlet 500-000
KA500 – Standard, 4″ Inlet 500-001
KA500 – Ground Isolated, 4″ Inlet 500-002
KA500 – Ground Isolated with Noise Suppression, 4″ Inlet 500-003
KA500 – Standard, Ductless 500-004
KA500 – Ground Isolated with Noise Suppression, Ductless 500-005
KA500 – Ground Isolated with Noise Suppression, 3″ Inlet 500-006

KA535 Series

KIRK's new line of KA535 high-output alternators are drop-in replacements for both the Delco Remy 50DN+ and EMP Power535 alternators. KIRKS KA series alternators are 100% manufactured in Detroit, MI at KIRKS headquarters and meet FTA Buy America requirements.

— Specifications (for all KA535 units)

Air-Cooled, 12 Phase Alternator
535A @ 5000 RPM
Brushless Design
Operational Speed: 1800 – 6500 RPM
Intermittent Speed: 8000 RPM
Turn on Speed: 1250 RPM
Rotation: CW or CCW
Ambient Temp Range: -40 to 95C
Storage Temp: -40 to 125C
Weight: 100 lbs.
Mounting: Pad, Radius
Polarity: Negative Ground
Voltage Regulation: Standard 50DN
Drop In Replacement for Remy 50DN and EMP Power535
Options Part Number
KA535 – Ground Isolated with Noise Suppression, 4″ Inlet 500-007
KA535 – Standard, Ductless 500-008
KA535 – Ground Isolated with Noise Suppression, Ductless 500-009

Remanufactured EMP Alternators

KIRK's remanufactures all variations of the EMP Power 450 and Power 535 alternators for transit applications.

KIRKS Certified Quality badge
REMAN EMP Alternators
3″ Inlet 4″ Inlet 4″ Inlet
Ground Isolation
4″ Inlet
Ground Isolation
Noise Suppression
Ductless Inlet
(EMP unit retrofitted with ductless rear cover)
REMAN Power
450 Alternators
KRK POWER450 KRK POWER450-4 KRK POWER450-4GI KRK POWER450-4GINS KRK POWER450D
REMAN Power
535 Alternators
n/a n/a n/a KRK POWER535 KRK POWER535D

— Every REMAN POWER450/535 includes:

NEW! High Current Rectifier Diodes
NEW! Rectifier Insulator Bridges and Upgraded Copper Interconnects
NEW! High Temp Self-Adhering Rectifier Insulator Gasket
NEW! High Temp Sealed Bearings, Stainless Wave Washer, and 0-Ring
NEW! F1 and AC Harnesses with A+ Grade Insulation
NEW! Grommets and Retaining Clips
NEW! Assembly Hardware
Rewound Field Coils with Upgraded Long-Life Leads Wires

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