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Alternator Shields Part #'s AS12, AS24, & AS48

Alternator Shields Part #'s AS12, AS24, & AS48

AS12

$88.00 USD
$88.00 USD
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The ARCO Zeus Alternator Shield series consists of surge protection devices designed to safeguard high-output marine alternators from catastrophic voltage spikes caused by sudden battery disconnects or "load dump" events. These issues commonly occur when a Lithium battery's Battery Management System (BMS) suddenly triggers a protective shutdown, or if a battery switch is accidentally turned off while the engine is running.
The family is categorized strictly by system voltage:
  • ARCO Zeus Alternator Shield - 12V [AS12]: Designed specifically for standard 12-volt marine and vehicle electrical systems.
  • ARCO Zeus Alternator Shield - 24V [AS24]: Engineered for 24-volt commercial, military, or heavy-duty marine electrical configurations.
  • ARCO Zeus Alternator Shield - 48V [AS48]: Built for modern, high-voltage 48-volt lithium battery banks and propulsion systems.

Key Specifications & Mechanics
  • Protection Method: Clamps excess surge voltage and safely diverts it to the ground, protecting the alternator's internal internal diodes from frying.
  • Standard Rating: Tested to the strict ISO 16750-2 Load Dump Standard.
  • Performance: Delivers up to 75% more survivable disconnect events compared to leading market competitors like the Balmar APM.
  • Status Indicators: Features a built-in diagnostic LED. A Green LED confirms active protection; a Red or unlit LED indicates the device has absorbed its maximum limit of surges and requires immediate replacement.

Specifications

Specifications by Model:
ARCO AS12
System Voltage: 12 Volts
Application: Standard marine and vehicle electrical systemsCore Function: Voltage surge clamping
Compliance: ISO 16750-2 Load Dump Standard
Environment: Marine-grade housing
Monitoring: Diagnostic status LED
Battery Types: Lithium (LiFePO4) and AGM
Mounting: Alternator B+ and B- posts

ARCO AS24
System Voltage: 24 Volts
Application: Heavy-duty, commercial, or military systems
Core Function: Voltage surge clamping
Compliance: ISO 16750-2 Load Dump Standard
Environment: Marine-grade housing
Monitoring: Diagnostic status LED
Battery Types: Lithium (LiFePO4) and AGM
Mounting: Alternator B+ and B- posts

ARCO AS48
System Voltage: 48 Volts
Application: High-voltage lithium banks and propulsion systems
Core Function: Voltage surge clamping
Compliance: ISO 16750-2 Load Dump Standard
Environment: Marine-grade housing
Monitoring: Diagnostic status LED
Battery Types: Lithium (LiFePO4) and AGM
Mounting: Alternator B+ and B- posts
Shared Performance Specifications
Protection Method: Diverts destructive voltage spikes away from alternator diodes
Survival Rate: Up to 75% more disconnect protection than leading competitor models
LED Green State: Device is fully operational and actively protecting the system
LED Red State: Sacrificial elements are depleted and the shield must be replaced

Installation Details

Installation can be completed in minutes directly at the alternator terminals. Both ring terminals must be placed on the very top of the ring terminal stack on the alternator posts. The red/black wire connects to the positive post (B+), and the yellow/black wire connects directly to the negative ground post (B-).

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Voltage

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