Egis Mobile Electric 7421-24 TH3 160A 24V DC Sealed Single-Pole Relay

The Egis Mobile Electric TH3 Relay (7421-24) is a heavy-duty, 160-amp sealed single-pole relay designed for 24V DC electrical systems in marine, commercial vehicle, and powersports applications. It replaces traditional manual battery switches, reducing battery cable run lengths and the voltage drop that comes with them.

Connected to an engine ignition line, the TH3 supports simple battery charge management between two batteries or enables straightforward auxiliary load disconnection. It also extends the capability of TH Series Automatic Charging Relays, providing additional current-carrying capacity or connecting an independent, isolated battery bank that lacks its own charge source.

Key Features:

• Simple & Robust Installation: Includes a sealed MX-150 plug/harness with 2 ft control wires, reducing install time and cost
• Bullet-Proof Construction: Fully sealed unit with high-temperature materials — mountable anywhere on the vehicle or vessel
• Stainless Steel Self-Locking Hardware: 100% non-ferrous, corrosion-resistant materials with self-locking attachment screws and nuts
• Integral Diode Suppression: Reduces voltage spikes on control lines during switching
• Single or Dual Split Output Options: Provides flexibility for different electrical system configurations
• Optional Output Bus Bar: Enables simple, compact connection to RT or CT fuse block product families
• Optional Deutsch DT/AT Connector Output: Supports industry-standard marine and commercial vehicle connectors (see P/N: 7421-24D)

Primary Specifications:

• Continuous Current: 160A
• Intermittent Current: 240A
• Voltage Range: 16–34V DC
• On-State Current Draw @ 24V: 175 mA
• Maximum Cable Size: 2/0 AWG
• Terminal Stud Torque: 80 in-lb / 9.1 N-m

The TH3 7421-24 is an ideal solution for boats, RVs, and commercial vehicles requiring reliable, low-maintenance battery management and load control in a 24-volt system.