48525 LITTELFUSE | Alldatasheet

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Technical content

© 2016 Littelfuse Commercial Vehicle Products Rev: 120116 littelfuse.com 1 of 4 Product Datasheet SMART BATTERY ISOLATOR Prevents Loads On Auxiliary Battery From Draining The Starting Battery Specifications Overview Max Input Voltage: 16V Continuous Current: 48525 – 85A 48530 – 200A Ingress Protection: IP65 Vibration: 10-500Hz Operating Temperature Range: -40 to +85 °C Web Resources Download technical resources at: littelfuse.com/SmartBatteryIsolator Datasheet Replaces Hotfeed Number D-617

Description

More flexible than traditional Isolators and works with all alternator types. The Smart Battery Isolators are smaller, lighter, less heat generated. No diode efficiency losses and reduces charging system workload by not connecting auxiliary battery until primary battery is charged to 13.2V . Lower strain on expensive charging components extends their useful life. Allows bi-directional charging from alternator or from shore/ campground power charger/converter when available. Features and Benefits

  • Simple installation - Connect to starting battery, auxiliary battery, and ground.
  • LED status indicator.
  • Optional Start Assist – Momentary switch allows the auxiliary battery to assist the starting battery.

Ordering Information

2.93” [74.4mm] 0.71” [18.0mm] 3.34” [85.0mm] TO AUX BATTERY PURPLE: BOOST BLACK TO GROUND WHITE: STATUS 3.27” [83.1mm] 1.74” [44.2mm] TO MAIN BATTERY

© 2016 Littelfuse Commercial Vehicle Products Rev: 120116 littelfuse.com 2 of 4 Product Datasheet Environmental Specifications T erminal T orque Specifications

Electrical Characteristics

PER SAE J1455 PARAMETER NOTES Operating Temperature Range -40 to +85 °C Operating condition Ingress Protection IP65 Per IEC Humidity 0 to 90% RH Vibration 10-500Hz per SAE J1455 Shock per SAE J1455 Thermal Shock per SAE J1455 EMI/RF per SAE J1455 & J1113 Battery Terminals 5/16-24 50 in-lbs (5.78 Nm) CHARACTERISTIC MIN TYPICAL MAX NOTES Normal Input Voltage 9V 16V Voltage range unit is guaranteed to function within specification. Continuous Current 48525 48530 85A 200 A Connect Voltage 13.2V After 2 minutes at this level Disconnect Voltage 12.7V After 1 minute at this level Quiescent Current 5mA 8mA Relay off, start signal input open or grounded SMART BATTERY ISOLATOR Visit Littelfuse.com for the most up-to-date product information. Littelfuse products are designed for specific applications and should not be used for any purpose (including, without limitation, automotive applications) not expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse product documentation. 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 product documentation. Datasheet Replaces Hotfeed Number D-617

© 2016 Littelfuse Commercial Vehicle Products Rev: 120116 littelfuse.com 3 of 4 Product Datasheet Normal Operation Sequence When the vehicle has been running, the alternator charges both battery banks through the Smart Isolator. When the engine is turned off, the alternator no longer supplies a charge to the batteries, and the loads on the batteries begin to deplete them. When the vehicle is restarted, the starting battery has enough power to crank the engine, but the auxiliary battery is significantly depleted. The Smart Battery Isolator is open and the battery banks are separated. Now both batteries are charged again. When batteries reach 12.7V , the Smart Battery Isolator senses it, opens the solenoid relay to separate the battery banks, and turns off the status light. This protects the starting battery while allowing the auxiliary battery to continue to power the auxiliary loads. The engine is powering the alternator, and the starting battery has reached 13.2V . Only now does the Smart Battery Isolator reconnect, enabling the depleted auxiliary battery to be charged. By not reconnecting until the main battery is charged, the alternator is protected from excessive loads. HOW A SMART BATTERY ISOLATOR WORKS

© 2016 Littelfuse Commercial Vehicle Products Rev: 120116 littelfuse.com 4 of 4 Product Datasheet HOW A SMART BATTERY ISOLATOR WORKS Using the Auxiliary Battery for a Start Boost Connection Schematic Suggested Part Numbers: The main battery has been depleted and does not have enough power to start the engine. Voltage is greater than 9.5V The boost switch is pressed. It closes the Smart Battery Isolator solenoid for one minute. Now the power in the auxiliary battery is available for starting. The alternator begins to charge the batteries. After one minute the Smart Battery Isolator reverts to the automatic mode. If the starting battery has not reached 13.2V , it isolates the batteries to reduce stress on the alternator. Once the main battery reaches 13.2V , it reconnects and charges the auxiliary battery. REMOTE STATUS LIGHT PL-612-R PL-118-RC M-326-RC M-328-RC REMOTE STATUS LIGHT 9216-03 55020-04 M-626-02 M-58031-07