Diode Battery Isolators Series - Battery Isolator 200A

External overview image
Roll Over to Zoom
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 alternators

Access specifications, certifications, check availability and order parts below

Catalog #Current Rating (Continuous) in AmpsVoltage Rating MaxIngress ProtectionOutput TerminalsHousingCompare
4805175Fully SealedTwo 1/4 StudsBlue Heatsink
48051-BX
48051-BX75Fully SealedBlue Heatsink
480707036Fully SealedThree 1/4 StudsBlue Heatsink
48070-BX
48070-BX7036Fully SealedBlue Heatsink
480909036Fully SealedThree 1/4 StudsBlue Heatsink
48090-BX
48090-BX9036Fully SealedBlue Heatsink
4812014036Fully SealedThree 5/16 StudsBlue Heatsink
48120-BX
48120-BX14036Fully SealedBlue Heatsink
4812214036Fully SealedThree 5/16 Studs and one #10 studBlue Heatsink
48122-BX
48122-BX14036Fully SealedBlue Heatsink
4816020036Fully SealedThree 5/16 StudsBlue Heatsink
48160-BX
48160-BX2036Fully SealedBlue Heatsink
4816125024Fully SealedThree 5/16 StudsBlue Heatsink
48161-BX
48161-BX25024Fully SealedBlue Heatsink
4816220036Fully SealedThree 5/16 Studs and one #10 studBlue Heatsink
48162-BX
48162-BX20036Fully SealedBlue Heatsink
48092
Obsolete: 2019 -01-01
Fully SealedThree 1/4 Studs and one #10 stud
To request product environmental information, please complete the Product Environmental Information Request Form.