Diode Battery Isolators Series - 2-, 3- & 4-Stud Battery Isolators for Various Alternators & Medical Vehicles
For 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. In addition, both batteries can be charged simultaneously from one source.
The amp rating of each item is the maximum alternator rating. Most alternators on new vehicles have an integral electronic voltage regulator that requires the use of the 4-stud battery isolator. The small 4th stud is for connection to a circuit switched by the ignition switch. The newer alternators were first introduced by Delco and are therefore sometimes called ‘Delcotron-type alternators’. 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.
Features
General purpose Battery Isolators for 12-36V DC negative ground systems
Electronic components are embedded to give excellent protection from adverse conditions, such as contamination and vibration
Integral heat sink provides efficient heat dissipation
Per Leg Ratings
Battery isolators have a ‘per leg’ rating which indicates the maximum current it can deliver to either battery. All Littelfuse–Cole Hersee brand battery isolators have a per leg rating equal to half the alternator rating. For example, the 48051 with a rating of 75A has a per leg rating of 37.5A per leg.
Ordering Information
Part Number
Amp
Notes
48051
75 A
Used to isolate medical equipment batteries from vehicle batteries. With Schottky diode, to comply with Federal Spec. KKK-A-1822B
48070
70 A
Use with alternators that do not have integral electronic voltage regulator
48090
90 A
Use with alternators that do not have integral electronic voltage regulator
48092
90 A
For use with Delcotron-type alternators
48120
140 A
Use with alternators that do not have integral electronic voltage regulator
48122
140 A
For use with Delcotron-type alternators
48160
200 A
Use with alternators that do not have integral electronic voltage regulator
48161
250 A
Used to isolate medical equipment batteries from vehicle batteries. With Schottky diode, to comply with Federal Spec. KKK-A-1822B
48162
200 A
For use with Delcotron-type alternatorsOrdering Information
| Catalog # | Description | Rating | Terminals | Sealing | Size | Installation | Details |
|---|---|---|---|---|---|---|---|
| 48051 | 75 A Battery Isolator | 12 Vdc Only | Two 1/4 studs | Fully Sealed | 3-1/2L X 4-15/16W x 3-11/32H | Two 9/32 dia holes | Schottky Diode - Comply With Federal Spec KKK-A-1822B for Ambulances |
| 48070 | 70 A Battery Isolator | 12-36 Vdc Negative Ground Systems | Three 1/4 studs | Fully Sealed | 5L x 3-1/4W x 2-3/16H | Two 9/32 dia holes | Use with Alternators without Integral Electronic Voltage Regulator |
| 48090 | 90 A Battery Isolator | 12-36 Vdc Negative Ground Systems | Three 1/4 studs | Fully Sealed | 6-1/2L x 3-1/4W x 2-13/16H | Two 9/32 dia holes | Use with Alternators without Integral Electronic Voltage Regulator |
| 48092 | 90 A Battery Isolator | 12-36 Vdc Negative Ground Systems | Three 1/4 studs and one #10 stud | Fully Sealed | 6-1/2L x 3-1/4W x 2-13/16H | Two 9/32 dia holes | Use with Delcotron-Type Alternators |
| 48120 | 140 A Battery Isolator | 12-36 Vdc Negative Ground Systems | Three 5/16 studs | Fully Sealed | 6L x 4-3/16W x 3-11/32H | Two 9/32 dia holes | Use with Alternators without Integral Electronic Voltage Regulator |
| 48122 | 140 A Battery Isolator | 12-36 Vdc Negative Ground Systems | Three 5/16 studs and one #10 stud | Fully Sealed | 6L x 4-3/16W x 3-11/32H | Two 9/32 dia holes | Use with Delcotron-Type Alternators |
| 48160 | 200 A Battery Isolator | 12-36 Vdc Negative Ground Systems | Three 5/16 studs | Fully Sealed | 8-1/2L x 4-3/16W x 3-13/32H | Two 9/32 dia holes | Use with Alternators without Integral Electronic Voltage Regulator |
| 48161 | 250 A Battery Isolator | 12-36 Vdc Negative Ground Systems | Three 5/16 studs | Fully Sealed | 8-1/2L x 4-3/16W x 3-13/32H | Two 9/32 dia holes | Schottky Diode - Comply With Federal Spec KKK-A-1822B for Ambulances |
| 48162 | 200 A Battery Isolator | 12-36 Vdc Negative Ground Systems | Three 5/16 studs and one #10 stud | Fully Sealed | 8-1/2L x 4-3/16W x 3-13/32H | Two 9/32 dia holes | Use with Delcotron-Type Alternators |
Resources
- Battery Isolators 2D Prints diode-battery-isolators
- Battery Isolator Wiring Guide for Delcotron Alternators diode-battery-isolators
