With Schottky diode, to comply with Federal Spec. Used to isolate medical equipment batteries from vehicle batteries.

Use with alternators that do not have integral electronic voltage regulator ACDelco Replacement Electrical Parts from an Authorized Dealer. Used to isolate medical equipment batteries from vehicle batteries. 63 Isolation relays are required in parallel applications. For example, the 48051 with a rating of 75A has a per leg rating of 37.5A per leg. All Littelfuse Cole Hersee brand battery isolators have a per leg rating equal to half the alternator rating.

Integral heat sink provides efficient heat dissipationīattery isolators have a 'per leg' rating which indicates the maximum current it can deliver to either battery.

Electronic components are embedded to give excellent protection from adverse conditions, such as contamination and vibration.

General purpose Battery Isolators for 12-36V DC negative ground systems.

A 4-stud battery isolator can be used with older pattern alternators (in this case the 4th stud will remain unconnected), but a 3-stud battery isolator cannot be used with the Delcotron-type alternator.

The newer alternators were first introduced by Delco and are therefore sometimes called 'Delcotron-type alternators'. The small 4th stud is for connection to a circuit switched by the ignition switch. Most alternators on new vehicles have an integral electronic voltage regulator that requires the use of the 4-stud battery isolator. The amp rating of each item is the maximum alternator rating. In addition, both batteries can be charged simultaneously from one source. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse. 'Littelfuse' includes Littelfuse, Inc., and all of its affiliate entities.įor vehicles with two batteries, these devices electrically isolate the batteries to prevent the battery with the higher charge from draining into that with the lower charge. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Thus, in most of the scenarios, Relay-based Isolator is the preferred choice for Dual Battery Applications involving battery banks of at least one Main Battery and one Auxiliary Battery.Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. motor vehicle air conditioner involving the refrigerant for. However, if the drain on the charging system by the auxiliary or main battery bank reduces the system voltage below a certain point, it will disconnect the battery banks from each other, protecting them from excessive drain.

The reserve battery system is used for vital loads like engine starting, navigation or communications. If the Relay-based Isolator determines that there’s not enough voltage in the primary source to perform an essential function, such as starting an engine, it will open the solenoid and allow current to flow from the auxiliary battery to make up the difference. Battery Isolators, Automatic Charging Relays (also called ACRs, combiners, or voltage sensitive relays) are all intended to keep a load (or loads) from discharging the reserve battery system. When the engine starter is engaged, the Relay-based Isolator compares the voltage in both main and auxiliary batteries. Relay-based Isolator is best seen as switch that can direct current, enabling primary and auxiliary bank of batteries to be charged from a single source, using a solenoid. The higher the current, the bigger the voltage drop and the lower the efficiency of charging the dual battery. A Relay-based Isolator have no apparent voltage drop while for Diode-based Isolator there will be minimally 0.7V – 1.5V drop across the diode depending on the amount of current pass through.

Battery isolator relay ac delco