BEP 710-140A · Digital voltage sensing relay
Automatically combines battery banks for charging and separates them when voltage falls; supports 12V and 24V electrical systems.
View item and check conditionBEP Battery Charging Relays vs Remote Switches: MPN Guide
Marine and RV electrical systems can use separate batteries for starting and equipment loads. BEP offers devices that make those circuits easier to manage, but a voltage sensing relay does a different job from a remote battery on/off switch. If you are replacing a failed unit, start with the exact printed part number and its function rather than choosing by appearance alone.
Three different battery-control functions
Automatic charge sharingA digital voltage sensing relay joins battery banks while charging voltage is high enough, then separates them when charging ends. The 710-140A is in this category.
Remote on/off isolationA motor-driven switch can open and close a high-current circuit using remote controls. 701-MD performs this function; it is not a charger and does not automatically sense charging voltage.
Motorized automatic combiningA motor-operated device such as 720-MDVSO combines or isolates compatible battery banks based on charging voltage and provides an override function.
Compare BEP model numbers before ordering
| BEP MPN | What it does | Voltage / ratings | Important distinction |
|---|---|---|---|
| 710-140A | Digital voltage sensing relay (DVSR) | 12V or 24V automatic selection; 125A continuous, 140A intermittent | Small automatic charging combiner; manufacturer catalog lists 13.4/26.8V engagement and 12.8/25.6V disengagement thresholds |
| 701-MD | Motor-driven battery on/off disconnect | 9.5–32V control operating range; 275A continuous rating | Remote on/off switching without the automatic voltage-sensitive charging function |
| 720-MDVSO | Motorized voltage-sensitive battery combiner | 12V or 24V systems; 500A continuous rating | Two banks must be the same system voltage; manual override and automatic charge-sharing control |
For the 720-MDVSO, BEP's catalog lists voltage thresholds of 13.3V/26.6V for engagement and 12.7V/25.4V for disengagement. These are switching thresholds, not a battery-charger output specification.
Rating clarification: BEP's detailed catalog distinguishes the 710-140A's 125A continuous capability from its 140A intermittent rating. When comparing models, do not treat the 140A figure as the sustained current rating. Electrical circuit protection and conductor sizing must follow the device's full installation instructions.
Installation and replacement checks
- Read the MPN printed on the original housing. A 710-140A, 701-MD and 720-MDVSO are not direct substitutes for each other.
- Confirm the intended function: automatic charging isolation, remote on/off isolation, or motorized voltage-sensitive charge sharing.
- Check nominal system voltage, continuous current rating, terminal layout and cable size before connecting batteries.
- Review ignition-protection requirements, switching control wiring and the manufacturer's wiring diagram for the specific model.
- When replacing a motorized device, confirm the remote switch and override connections rather than relying on the high-current cable connections alone.
Common questions
Does a voltage sensing relay charge the batteries itself? No. The relay connects battery banks when suitable charging voltage is present. A compatible alternator or charger supplies the energy.
Can a 701-MD replace a 710-140A? Not for automatic charging control. The 701-MD is a remote-operated battery switch with a different operating function.
Does the 720-MDVSO connect a 12V bank to a 24V bank? No. BEP specifies that the two banks in its 12V/24V motorized VSR arrangement must operate at the same voltage.
BEP battery-control products in our catalog
Open the exact item to check its condition, availability and included components. Catalog photographs illustrate the model and do not establish the cosmetic condition of an individual unit.
BEP 701-MD · Motor-driven remote on/off switch
Remotely opens or closes a battery circuit; not an automatic voltage-sensing charging relay.
View item and check condition
BEP 720-MDVSO · Motorized voltage-sensing combiner
Heavy-duty automatic combining and isolation for two same-voltage battery banks, with manual override facility.
View item and check conditionRelated battery equipment references
For manually operated selectors rather than automatic charging relays, see BEP 700, 701, 701S and 720 battery-switch identification. For terminal and cable distribution hardware, see BEP Pro Installer busbar identification. Each guide covers a different component family.
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