Hamolar 2 Pack 12V 200 Amp Continuous Duty Relay Switch Car

Hamolar's 2-pack 12V 200A continuous-duty SPST relays are heavy-duty make/break switches built for split-charge, starter and high-current automotive, marine, and truck applications.

These relays combine rugged construction, silver-plated contacts and alloy terminals to deliver reliable high-current switching for 12V systems up to 14V. Supplied as a pair, the relays are rated for 200 amps continuous duty and include terminals and gaskets to simplify installation. Designed with flame-retardant housings and robust internal parts, they are appropriate for split-charge setups, starter isolation, auxiliary power routing and other heavy-load circuits where a dependable, low-resistance switch is needed.

How does this relay handle heavy current without overheating?

The Hamolar relay uses silver-plated internal contacts and high-quality alloy terminals to reduce resistance and heat buildup during prolonged high-current operation. Its continuous 200A rating means it’s engineered to carry sustained loads rather than brief surges, and the flame-retardant housing helps contain heat safely.

• Silver-plated contacts lower electrical resistance for cooler operation.
• Alloy terminals provide firm, corrosion-resistant connections.
• 200A continuous duty rating supports sustained high loads.
• Flame-retardant casing for safer thermal performance.

Can I use these relays for split charging between two batteries?

Yes — the 4-terminal SPST design is commonly used to isolate or link batteries in split-charge arrangements, allowing charging sources to feed a secondary battery only when required. The relays’ make/break action reliably connects or disconnects battery banks while handling the high currents typical of starter and charging systems.

• Simple SPST operation for on/off battery linking.
• 200A capacity covers most starter and alternator currents.
• Gaskets and terminals included to ease wiring and sealing.
• Works with 12V (up to 14V) vehicle and marine systems.

What installation details should I know before wiring one of these relays?

Installation is straightforward but requires correct terminal connections and secure mounting to handle vibration. Each relay has four terminals: two for the switching circuit and two for the coil/control; use appropriately sized cables and torque for the high-current terminals and fit the supplied gaskets to protect against moisture.

• Use heavy-gauge cable for the 200A load terminals.
• Securely torque terminals to prevent heating at contact points.
• Mount in a vibration-resistant location with the gasket fitted.
• Confirm coil voltage is 12VDC (maximum 14V) before connecting.

How long will these relays last in real-world conditions?

Durability depends on load, environment and installation, but the Hamolar relays are built from flame-retardant materials and plated contacts to extend service life under heavy use. Regular maintenance—tightening terminals and avoiding prolonged corrosion exposure—will maximize lifespan for automotive, marine or truck installations.

• Plated contacts resist wear and corrosion for longer cycles.
• Robust casing resists heat and flame for safer operation.
• Supplied gaskets protect terminals from moisture and salt air.
• Designed for continuous duty rather than intermittent-only use.

Who is this for? This 2-pack is intended for mechanics, boat owners, truck drivers, fleet managers and DIYers who need a reliable, high-current switching solution for 12V systems. It’s especially useful when you need to split-charge batteries, isolate a starter circuit, or route heavy accessory loads safely. If you require a continuous-duty, high-amp relay with durable materials and simple installation accessories, these Hamolar relays are a practical, cost-effective choice.