Switch Battery Heavy Duty On-Off

Overview

Switch Battery Heavy Duty On-Off is a high-current battery switch designed for large diesel engine electrical systems. It features a make-before-break selector, ignition protection with UL Listing, and AFD (Alternator Field Disconnect) capability to switch while the engine runs without damaging the alternator.

Key Features

• Up to 600A continuous rating
• Make-before-break contact design
• One-piece tin-plated copper stud design
• Terminal studs accept 1/2″ or M12 ring terminals
• Ignition protected and UL Listed
• AFD (Alternator Field Disconnect) models allow switching while running the engine without damaging the alternator

Compatible Applications

• Heavy-duty battery switching for large diesel engine electrical systems
• Alternator Field Disconnect (AFD) configurations
• Marine and industrial electrical installations requiring robust on-off control
• Ignition-protected, UL-listed high-current switches

Product Details

• SKU: 661-3000
• Weight: 499 grams
• Cranking Rating 30 sec.: 1750A DC
• Cranking Rating 1 min.: 1325A
• Intermittent Rating 5 min.: 900A
• Continuous Rating: 600A
• Terminal studs accept 1/2″ or M12 ring terminals
• Construction: One-piece tin-plated copper stud design
• Protection: Ignition protected; UL Listed
• AFD: Alternator Field Disconnect models allow switching while running the engine without damaging the alternator

Parts Desk Insights

Best Use Case: Best used in large diesel engine electrical systems where reliable high-current switching is needed, including configurations that require Alternator Field Disconnect (AFD) to switch while the engine is running.

Common Issues: Common issues include ensuring correct terminal size (1/2″ or M12) for secure connections and confirming load ratings align with the application to prevent excessive current draw; verify installation in appropriate ignition-protected environments.

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