Newmar ERC-12-35 Emergency Relay

The ERC-12-35 Emergency Relay is an essential component for marine and boating enthusiasts, ensuring uninterrupted power supply to your vessel's critical communication and navigation equipment. Designed to seamlessly switch to a backup battery in the event of power interruptions, this relay provides reliable performance under the demanding conditions of marine environments.

Key Features

• Immediate Backup Power: Automatically switches to a standby battery when DC voltage is lost, ensuring continuous operation of essential marine equipment.
• Trickle Charging: Maintains battery charge by directing a small portion of the output current to the battery during normal operation.
• Robust Relay: Equipped with a fast-acting S.P.D.T. relay rated for 30 amps continuous and 35 amps intermittent, suitable for demanding marine applications.
• Flexible Installation: Can be mounted vertically, horizontally, or upside-down, providing versatility for various marine installations.
• Compact Design: With dimensions of 5-1/8" x 2-7/8" x 3-5/8" and a lightweight build of 1.15 lbs, it fits easily into tight spaces on your vessel.
• Corrosion-Resistant: Designed to withstand the harsh marine environment, ensuring long-lasting performance.

Technical Specifications

Parameter	Specification
Input Range	10.0-14.5 VDC (12V)
Relay Rating	30 amps continuous & 35 amps intermittent
Float Trickle	0.1 amps (typical)
Dimensions	5-1/8" x 2-7/8" x 3-5/8"
Weight	1.15 lbs

Installation Guide

Proper installation of the ERC-12-35 Emergency Relay is crucial for optimal performance and safety on your vessel.

1. Location Selection: Choose a dry, accessible location close to your battery to minimize wire lengths and potential voltage drops. Ensure the area is free from accidental contact to prevent short circuits.
2. Mounting: Secure the relay using two #10 sheet metal or wood screws. The ERC-12-35 can be mounted vertically, horizontally, or even upside-down without affecting its functionality.
3. Safety Considerations: Avoid mounting the relay in unventilated enclosures where battery gases may accumulate. Ensure the installation area is free from explosive gases and flames to prevent hazards.

Wiring Instructions

Follow these steps to ensure a safe and efficient wiring setup:

1. Wire Selection: Use the appropriate wire gauge based on the total length of the wire run. Refer to the table below for guidance:

Wire Length	Recommended Gauge
5 ft.	#8 AWG
10 ft.	#6 AWG
15-20 ft.	#4 AWG

2. Connection: Use the provided crimp ring lug connectors to secure the wiring to the ERC-12-35. Ensure all connections are tight and free from corrosion.
3. Terminal Covers: For models ERC-12-15 and ERC-24-15, reinstall the yellow plastic terminal covers after wiring to prevent accidental shorting.

Important Considerations

Extended Power Loss: If the power supply is unavailable for an extended period, the backup battery may become significantly discharged while powering your marine radio or communication equipment. In such cases, the ERC-12-35's trickle charge rate may be insufficient to restore the battery promptly. A supplemental charger may be required to fully recharge the battery.

Battery Maintenance: Ensure that battery terminals are clean and free from corrosion to maintain optimal performance and longevity of both the battery and the ERC.

Additional Resources

For more detailed information, refer to the Owner's Manual (PDF).

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