Havis Battery Isolators & Voltage Sensitive Relays
Havis Power Protection: Battery Isolators & Voltage Sensitive Relays
Havis has spent more than 80 years engineering mission-critical solutions for public safety, fleet, military, and utility vehicles — environments where electrical reliability is not optional. That deep understanding of demanding mobile environments is exactly what shapes their approach to battery isolators and voltage sensitive relays, a category where a single voltage anomaly can take down thousands of dollars in mobile electronics or leave a vehicle stranded mid-shift.
The ChargeGuard-Select: Patented Voltage Intelligence
Havis's standout offering in this space is the ChargeGuard-Select (CG-X) — a patented, self-contained power management module purpose-built for vehicle electrical systems. Unlike a simple mechanical isolator, the ChargeGuard-Select functions as an intelligent voltage sentinel, continuously watching over the power system and responding dynamically to real-world conditions.
What sets it apart is its multi-mode sensing capability. The ChargeGuard features your choice of sensing mode, including automatic detection mode (AC), isolated alternator detection, voltage rise detection (DC only), or direct ignition mode (HL) — giving installers the flexibility to match the module's behavior precisely to the vehicle's electrical architecture.
This self-contained unit provides circuit protection for a vehicle's power system to prevent dead batteries and protect mobile electronics from voltage anomalies, while also offering the convenience of turning peripherals on precisely when needed and off when they're not, conserving battery life and reducing wear and tear.
Configurable Protection for Real-World Fleets
One of the most valued features among fleet upfitters is the ChargeGuard-Select's programmable timer. The ChargeGuard is able to monitor battery voltage and shut peripheral items down if it notices the required load exceeds capacity — ensuring there is always enough power to start the vehicle. Users can program it to different thresholds, such as setting a timer before shutting down peripherals, or cutting all power at a critically low voltage to preserve vehicle ignition capacity.
The unit's electrical specifications are equally well-suited to the rigors of mobile professional use. Key specs include a nominal operating voltage of 13.8V DC, a low voltage disconnect at 11V DC, a high voltage disconnect at 18V DC, a 30A load current rating, and a selectable time delay ranging from 5 seconds to 18 hours. An LED indicator provides at-a-glance status, signaling both under- and over-voltage conditions so technicians can diagnose issues without unplugging a thing.
Built for the Professionals Who Can't Afford Downtime
Havis has served the needs of the nation's finest police, fire, and EMS teams for more than 80 years with the industry's broadest selection of mounting and docking solutions. Their commitment to quality, custom solutions has made them the U.S. leader in public safety, and as a true manufacturer, Havis offers durability, safety, and nationwide support for a wide range of vehicle components that must meet strict requirements and rigorous environments.
Havis, Inc. is a privately held, ISO 9001-certified company that is the leader in providing robust and reliable end-to-end technology mounting and mobility solutions in demanding environments. That ISO certification isn't just a credential — it reflects a manufacturing discipline that flows directly into every ChargeGuard unit, from component selection to final quality inspection.
Whether you're upfitting a patrol cruiser, a utility fleet truck, or a mobile command vehicle, Havis battery isolators and voltage sensitive relays give you the confidence that your auxiliary electronics will stay protected, powered at the right time, and never at the expense of the vehicle's ability to start.