Egis Mobile Electric 7421 TH3 160-Amp 12V Single-Pole Sealed Relay

The Egis Mobile Electric 7421 TH3 Relay is a heavy-duty, 160-amp single-pole sealed relay designed to replace manual battery switches in marine, RV, automotive, and specialty vehicle electrical systems. By installing this relay inline between the battery and electrical loads, it reduces battery cable run lengths and minimizes costly voltage drop.

When wired to an engine ignition line, the TH3 supports simple battery charge management between two batteries or basic auxiliary load disconnection. It also integrates seamlessly with Egis TH Series Automatic Charging Relays or Time Delay Relays to provide additional isolated switched output or expanded current-carrying capacity for complex multi-battery setups.

Key Features:

• Replaces Manual Battery Switches: Reduces battery cable run lengths and resulting voltage drop
• Ignition Signal Compatible: Connect to the ignition line for simple battery charge management between two batteries or auxiliary load disconnection
• TH Series Expandable: Pairs with TH Series Automatic Charging Relays or Time Delay Relays to extend current capacity or add an isolated battery bank
• Simple & Robust Installation: Includes a sealed MX-150 plug/harness with 2 ft control wires; reduces install time and cost
• Optional Output Bus Bar: Provides a compact, direct connection to Egis RT or CT fuse block product families
• Bullet-Proof Construction: Fully sealed unit with high-temperature materials for mounting anywhere on the vehicle
• Stainless Steel Self-Locking Hardware: 100% non-ferrous, corrosion-resistant fasteners throughout
• Integral Diode Suppression: Reduces voltage spikes on control lines during switching
• Single or Dual Split Output Options: Provides flexibility for a wide range of electrical system configurations

Specifications:

• Continuous Current: 160A
• Intermittent Current: 240A
• Voltage Range: 8–18V DC (12V nominal)
• On-State Current Draw @ 12V: 350mA
• Max Cable Size: 2/0 AWG
• Terminal Stud Torque: 80 in-lb / 9.1 N-m
• UPC: 850035199893