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ARCO Zeus A4000-24V Low Turn On (LTO) High Output Alternator, 3.15"R Dual Foot, Rear Exit B+, External Only, Isolated Ground (4402)

Model: 4402 · SKU: 4402

Prepared Nov 12, 2026

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Common specifications

Rated output current	144 ASource [2, 3]
Sustained output current	108 ANeeds confirmationSource See note below[2, 3]
System voltage	24 VSource [2, 3]
Rotation	Not documented
Ground type	Isolated GroundSource [2]
Mounting	3.15"R Dual Foot, Rear Exit B+Source [2]
Pulley	49mm K6 (6 groove)Source [2]
Cut-in speed (RPM)	1,072 RPMSource [3]
Maximum speed (RPM)	19,000 RPMSource [3]
Stator size	138 mm5.43 in convertedSource [3]
Regulator included	External OnlySource [2, 3]
Cooling	Dual cooling fansSource [2, 3]
Efficiency	Not documented
Operating temperature	100 M °CSource [3]
Weight	Not documented
Dimensions	Not documented
Enclosure volume	Not documented
Warranty term	Not documented

All recorded specifications

Cooling	Dual cooling fansDocumented claim Conditions Printed as "Dual cooling fans" on ARCO's product page and "Dual Cooling fans" in the brochure's High Output Alternators list, which covers every Zeus high output alternator. Location: Product page description, "Coolest operating temperatures" list; brochure, High Output Alternators list Printed as "Dual cooling fans" on ARCO's product page and "Dual Cooling fans" in the brochure's High Output Alternators list, which covers every Zeus high output alternator. Location: Product page description, "Coolest operating temperatures" list; brochure, High Output Alternators list Official product page · ARCO Marine product page: ARCO Zeus A4000-24V Low Turn On (LTO) High Output Alternator (arcomarine.com, October 27, 2026 capture)Official document · ARCO Zeus High Energy Collection brochure: Bluetooth Alternator Regulator & High Output Alternators (v2, arcomarine.com, October 27, 2026 capture) [2, 3]
Cut-in speed (RPM)	1,072 RPMDocumented claim Conditions Printed as "Cut-In RPM 1,072 Alternator RPM" in the A4000-24V LTO product page's Technical Specifications, which cover every part number of the page. Location: Product page, Technical Specifications, Cut-In RPM row Printed as "Cut-In RPM 1,072 Alternator RPM" in the A4000-24V LTO product page's Technical Specifications, which cover every part number of the page. Location: Product page, Technical Specifications, Cut-In RPM row Official product page · ARCO Marine product page: ARCO Zeus A4000-24V Low Turn On (LTO) High Output Alternator (arcomarine.com, October 27, 2026 capture) [3]
Ground type	Isolated GroundDocumented claim Conditions Printed in the Ground Type column of the brochure row "24V 3,960 (144) 2,970 (108) 3.15"R Dual Foot, Rear Exit B+ External Only Isolated Ground 49mm K6 (6 groove) 4402". Location: Brochure, A4000-24V LTO DETAILS table, Ground Type column for part 4402 Printed in the Ground Type column of the brochure row "24V 3,960 (144) 2,970 (108) 3.15"R Dual Foot, Rear Exit B+ External Only Isolated Ground 49mm K6 (6 groove) 4402". Location: Brochure, A4000-24V LTO DETAILS table, Ground Type column for part 4402 Official document · ARCO Zeus High Energy Collection brochure: Bluetooth Alternator Regulator & High Output Alternators (v2, arcomarine.com, October 27, 2026 capture) [2]
Maximum speed (RPM)	19,000 RPMDocumented claim Conditions Printed as "Maximum Alt RPM 19,000" in the A4000-24V LTO product page's Technical Specifications. Location: Product page, Technical Specifications, Maximum Alt RPM row Printed as "Maximum Alt RPM 19,000" in the A4000-24V LTO product page's Technical Specifications. Location: Product page, Technical Specifications, Maximum Alt RPM row Official product page · ARCO Marine product page: ARCO Zeus A4000-24V Low Turn On (LTO) High Output Alternator (arcomarine.com, October 27, 2026 capture) [3]
Mounting	3.15"R Dual Foot, Rear Exit B+Documented claim Conditions The housing (mount) ARCO's brochure prints for part 4402, row "24V 3,960 (144) 2,970 (108) 3.15"R Dual Foot, Rear Exit B+ External Only Isolated Ground 49mm K6 (6 groove) 4402"; ground type Isolated Ground, pulley 49mm K6 (6 groove). Location: Brochure, A4000-24V LTO DETAILS table, Housing column for part 4402 The housing (mount) ARCO's brochure prints for part 4402, row "24V 3,960 (144) 2,970 (108) 3.15"R Dual Foot, Rear Exit B+ External Only Isolated Ground 49mm K6 (6 groove) 4402"; ground type Isolated Ground, pulley 49mm K6 (6 groove). Location: Brochure, A4000-24V LTO DETAILS table, Housing column for part 4402 Official document · ARCO Zeus High Energy Collection brochure: Bluetooth Alternator Regulator & High Output Alternators (v2, arcomarine.com, October 27, 2026 capture) [2]
Operating temperature	100 M °CDocumented claim Conditions Printed as "Max Continuous Operating Temperature 100°C" with its Fahrenheit figure in the product page's Technical Specifications; ARCO prints a maximum continuous operating temperature only, no lower limit. Location: Product page, Technical Specifications, Max Continuous Operating Temperature row Printed as "Max Continuous Operating Temperature 100°C" with its Fahrenheit figure in the product page's Technical Specifications; ARCO prints a maximum continuous operating temperature only, no lower limit. Location: Product page, Technical Specifications, Max Continuous Operating Temperature row Official product page · ARCO Marine product page: ARCO Zeus A4000-24V Low Turn On (LTO) High Output Alternator (arcomarine.com, October 27, 2026 capture) [3]
Pulley	49mm K6 (6 groove)Documented claim Conditions Printed in the Pulley column of the brochure row "24V 3,960 (144) 2,970 (108) 3.15"R Dual Foot, Rear Exit B+ External Only Isolated Ground 49mm K6 (6 groove) 4402". Location: Brochure, A4000-24V LTO DETAILS table, Pulley column for part 4402 Printed in the Pulley column of the brochure row "24V 3,960 (144) 2,970 (108) 3.15"R Dual Foot, Rear Exit B+ External Only Isolated Ground 49mm K6 (6 groove) 4402". Location: Brochure, A4000-24V LTO DETAILS table, Pulley column for part 4402 Official document · ARCO Zeus High Energy Collection brochure: Bluetooth Alternator Regulator & High Output Alternators (v2, arcomarine.com, October 27, 2026 capture) [2]
Rated output current	144 ADocumented claim Conditions The maximum output current ARCO prints for part 4402: its brochure's A4000-24V LTO DETAILS table row "24V 3,960 (144) 2,970 (108) 3.15"R Dual Foot, Rear Exit B+ External Only Isolated Ground 49mm K6 (6 groove) 4402" (Maximum Output column 3,960 (144)), and the product page's Technical Specifications row "Max Output (Cold, 9,000 RPM) at 27.5V 144 Amps - 3,960 Watts". Maximum output is the cold figure at 9,000 alternator RPM. The product page prints "Sustained Cruising Output (Hot, 6,000 RPM) at 27.5V 130 Amps" and "Sustained Idle Output (Hot, 3,000 RPM) at 27.5V 108 Amps". ARCO says "cold" testing was done at 71 °F and measures "hot" output after 60 minutes at 3,000 RPM under a plexiglass shield. Location: Brochure, A4000-24V LTO DETAILS table, row for part 4402; product page, Technical Specifications, Max Output row The maximum output current ARCO prints for part 4402: its brochure's A4000-24V LTO DETAILS table row "24V 3,960 (144) 2,970 (108) 3.15"R Dual Foot, Rear Exit B+ External Only Isolated Ground 49mm K6 (6 groove) 4402" (Maximum Output column 3,960 (144)), and the product page's Technical Specifications row "Max Output (Cold, 9,000 RPM) at 27.5V 144 Amps - 3,960 Watts". Maximum output is the cold figure at 9,000 alternator RPM. The product page prints "Sustained Cruising Output (Hot, 6,000 RPM) at 27.5V 130 Amps" and "Sustained Idle Output (Hot, 3,000 RPM) at 27.5V 108 Amps". ARCO says "cold" testing was done at 71 °F and measures "hot" output after 60 minutes at 3,000 RPM under a plexiglass shield. Location: Brochure, A4000-24V LTO DETAILS table, row for part 4402; product page, Technical Specifications, Max Output row Official document · ARCO Zeus High Energy Collection brochure: Bluetooth Alternator Regulator & High Output Alternators (v2, arcomarine.com, October 27, 2026 capture)Official product page · ARCO Marine product page: ARCO Zeus A4000-24V Low Turn On (LTO) High Output Alternator (arcomarine.com, October 27, 2026 capture) [2, 3]
Regulator included	External OnlyDocumented claim Conditions ARCO's brochure prints the regulation of part 4402 as "External Only" (row "24V 3,960 (144) 2,970 (108) 3.15"R Dual Foot, Rear Exit B+ External Only Isolated Ground 49mm K6 (6 groove) 4402"). The product page explains: "These units will come with a terminal block and a P-Type harness. They will only work with an external regulator". A regulator is not part of an External Only unit; ARCO names its Zeus Bluetooth regulator for these. Location: Brochure, A4000-24V LTO DETAILS table, Regulation column for part 4402; product page, Regulation notes ARCO's brochure prints the regulation of part 4402 as "External Only" (row "24V 3,960 (144) 2,970 (108) 3.15"R Dual Foot, Rear Exit B+ External Only Isolated Ground 49mm K6 (6 groove) 4402"). The product page explains: "These units will come with a terminal block and a P-Type harness. They will only work with an external regulator". A regulator is not part of an External Only unit; ARCO names its Zeus Bluetooth regulator for these. Location: Brochure, A4000-24V LTO DETAILS table, Regulation column for part 4402; product page, Regulation notes Official document · ARCO Zeus High Energy Collection brochure: Bluetooth Alternator Regulator & High Output Alternators (v2, arcomarine.com, October 27, 2026 capture)Official product page · ARCO Marine product page: ARCO Zeus A4000-24V Low Turn On (LTO) High Output Alternator (arcomarine.com, October 27, 2026 capture) [2, 3]
Stator size	138 mm5.43 in convertedDocumented claim Conditions Printed as "Stator Size 138mm" in the A4000-24V LTO product page's Technical Specifications. Location: Product page, Technical Specifications, Stator Size row Printed as "Stator Size 138mm" in the A4000-24V LTO product page's Technical Specifications. Location: Product page, Technical Specifications, Stator Size row Official product page · ARCO Marine product page: ARCO Zeus A4000-24V Low Turn On (LTO) High Output Alternator (arcomarine.com, October 27, 2026 capture) [3]
Sustained output current	108 ANeeds confirmationARCO's brochure part-number table and product page print 108 A for part 4402; the brochure's 24V Specifications table prints 115 A for both 24V models. Neither names a revision that supersedes the other. Conditions The sustained idle output ARCO prints for part 4402: the brochure row "24V 3,960 (144) 2,970 (108) 3.15"R Dual Foot, Rear Exit B+ External Only Isolated Ground 49mm K6 (6 groove) 4402" (Sustained Idle Output column 2,970 (108); its footnote reads "3,000 alternator RPM sustained under load and hot conditions for 1 hour.") and the product page's "Sustained Idle Output (Hot, 3,000 RPM) at 27.5V 108 Amps". The page also prints "Sustained Cruising Output (Hot, 6,000 RPM) at 27.5V 130 Amps". ARCO measures "hot" output after the alternator has run 60 minutes at 3,000 RPM under a plexiglass shield. Location: Brochure, A4000-24V LTO DETAILS table, Sustained Idle Output column for part 4402; product page, Technical Specifications, Sustained Idle Output row The sustained idle output ARCO prints for part 4402: the brochure row "24V 3,960 (144) 2,970 (108) 3.15"R Dual Foot, Rear Exit B+ External Only Isolated Ground 49mm K6 (6 groove) 4402" (Sustained Idle Output column 2,970 (108); its footnote reads "3,000 alternator RPM sustained under load and hot conditions for 1 hour.") and the product page's "Sustained Idle Output (Hot, 3,000 RPM) at 27.5V 108 Amps". The page also prints "Sustained Cruising Output (Hot, 6,000 RPM) at 27.5V 130 Amps". ARCO measures "hot" output after the alternator has run 60 minutes at 3,000 RPM under a plexiglass shield. Location: Brochure, A4000-24V LTO DETAILS table, Sustained Idle Output column for part 4402; product page, Technical Specifications, Sustained Idle Output row Official document · ARCO Zeus High Energy Collection brochure: Bluetooth Alternator Regulator & High Output Alternators (v2, arcomarine.com, October 27, 2026 capture)Official product page · ARCO Marine product page: ARCO Zeus A4000-24V Low Turn On (LTO) High Output Alternator (arcomarine.com, October 27, 2026 capture) [2, 3]
System voltage	24 VDocumented claim Conditions Printed as "Voltage 24V" in the product page's Technical Specifications and as the Voltage column of the brochure row "24V 3,960 (144) 2,970 (108) 3.15"R Dual Foot, Rear Exit B+ External Only Isolated Ground 49mm K6 (6 groove) 4402". Location: Brochure, A4000-24V LTO DETAILS table, Voltage column; product page, Technical Specifications, Voltage row Printed as "Voltage 24V" in the product page's Technical Specifications and as the Voltage column of the brochure row "24V 3,960 (144) 2,970 (108) 3.15"R Dual Foot, Rear Exit B+ External Only Isolated Ground 49mm K6 (6 groove) 4402". Location: Brochure, A4000-24V LTO DETAILS table, Voltage column; product page, Technical Specifications, Voltage row Official document · ARCO Zeus High Energy Collection brochure: Bluetooth Alternator Regulator & High Output Alternators (v2, arcomarine.com, October 27, 2026 capture)Official product page · ARCO Marine product page: ARCO Zeus A4000-24V Low Turn On (LTO) High Output Alternator (arcomarine.com, October 27, 2026 capture) [2, 3]

Warranty

Certificate records

No records documented.

Sources and revisions

ARCO Zeus Alternator Installation Guide 2025 (TECH-001 REV-B 8/18/25, arcomarine.com, October 29, 2026 capture)Official installation manual · Revision TECH-001 REV-B · 2025-08-18 · Checked Oct 26, 2026https://cdn.shopify.com/s/files/1/0110/9521/2098/files/TECH-001_ARCO_Zeus_Alternator_Installation_Guide_2025.pdf?v=1755639945
ARCO Zeus High Energy Collection brochure: Bluetooth Alternator Regulator & High Output Alternators (v2, arcomarine.com, October 27, 2026 capture)Official document · Revision 1001 Cat 1 Rev A · Checked Oct 26, 2026https://cdn.shopify.com/s/files/1/0110/9521/2098/files/The_ARCO_Zeus_Collection_Brochure_v2_488a3d13-7f71-461e-8999-4f88397839fc.pdf?v=1762453970
ARCO Marine product page: ARCO Zeus A4000-24V Low Turn On (LTO) High Output Alternator (arcomarine.com, October 27, 2026 capture)Official product page · Checked Oct 26, 2026https://arcomarine.com/products/arco-zeus-24-volt-4kw-low-turn-on-lto-high-output-alternator
ARCO Zeus High Output Alternator Wiring Connection Instructions (TECH001 - REV001 7/31/25, arcomarine.com, October 29, 2026 capture)Official document · Revision TECH001 - REV001 · 2025-07-31 · Checked Oct 29, 2026https://cdn.shopify.com/s/files/1/0110/9521/2098/files/ARCO_Zeus_Alternator_insert_2025_V3.pdf?v=1754409647
ARCO Zeus Alternator & Regulator OEM Troubleshooting Guide (TECH-002 REV-A 7/31/25, arcomarine.com, October 29, 2026 capture)Official instruction manual · Revision TECH-002 REV-A · 2025-07-31 · Checked Oct 29, 2026https://cdn.shopify.com/s/files/1/0110/9521/2098/files/TECH-002_ARCO_Zeus_Alternator_Regulator_OEM_Troubleshooting_Guide.pdf?v=1755639958
ARCO Zeus Installation Audit v1.0 (TECH-004 REV-A 7/31/2025, arcomarine.com, October 29, 2026 capture)Official instruction manual · Revision TECH-004 REV-A · 2025-07-31 · Checked Oct 29, 2026https://cdn.shopify.com/s/files/1/0110/9521/2098/files/TECH-004_ARCO_Zeus_Installation_Audit_v1.0.pdf?v=1755639979
ARCO Zeus High Energy Collection brochure (file The_ARCO_Zeus_Collection_Brochure.pdf, arcomarine.com, October 29, 2026 capture)Official document · Revision 1001 Cat 1 Rev A · Checked Oct 29, 2026https://cdn.shopify.com/s/files/1/0110/9521/2098/files/The_ARCO_Zeus_Collection_Brochure.pdf?v=1743020364