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Low Voltage Disconnect

SureStart Compact Low Voltage Disconnect Switch

    Compact LVD
-01    LVD & Harness
-03    LVD, Harness and Rocker Switch
    Harness

12 or 24V, 125A at 60ºC, 100A at 85ºC

Electronically senses battery voltage and conserves starting power. Automatically disconnects and reconnects loads based on battery condition; no operator action is required to protect the batteries. Prolongs battery life by preventing damage due to excessive discharge.

Eliminates the need for both separate timer or voltage sensing delay relay devices and high current relay or solenoid, and simplifies wiring and installation. Small size and lightweight design means easier and more discrete mounting, to use space more efficiently, eliminate hardware, and give better routing of wires.

When battery voltage falls below programmed voltage setting for 2 minutes non-critical loads are automatically disconnected. Waterproof and dustproof to IP67 international standard.

(Submersible to 3 feet.) Sealed connector makes it ideal for harsh environments. Advanced technology enables a robust product in a small lightweight package. Programmable timer feature automatically disconnects loads after key off, regardless of battery condition. Harness fits this LVD.

Specifications

• 4.5"W x 4.3"L x 3.1"H (114.3 x 108.6 x 79.0mm).
• Operating Temperature Range: -40° to +85°C (-40° to +185°F). 100A at 85°C, 125A at 60°C.
• Ingress Protection: IP66 per IEC 529.
• Humidity: 0 to 90 %RH.
• Vibration: 10-500 Hz per SAE J.
• Shock and Thermal Shock: per SAE J.
• Inductive Transient: +/- 600V per SAE J.
• Load Dump: + 100V per SAE J.
• Battery Terminal Torque: 50 in-lbs max.
• Operating Voltage: 9V min, 12V typical, 16V max if used with 12V DC systems.
• Disconnect Voltage: 12.05V min, 12.1V typical, 12.15V max
• When voltage drops below 12.1V, system activates the alarm for one minute and then disconnects loads.
• Quiescent Current: 1mA typical, 2mA max. Circuit operating current.
• Load Current: 100A at 85°C, 125A at 60°C.
• Overcurrent Protection: 150A. System will disconnect load and sound alarm after 5 seconds of excessive current.
• Key-Off Ttimer: 5 minutes minimum, 15 minutes typical. Option feature. After key off, unit will wait a set time before activating alarm. One minute later loads are shut off.

SureStartTM Automatic Low Voltage Disconnect Switch

Ensures ample starting capacity and prolongs battery life. Automatically disconnects non-critical loads from a battery when the battery voltage falls below a predefined threshold. Automatically reconnects the loads to the battery when it is being charged. Manual override permits a user to make or break the connection, regardless of battery voltage. Overcurrent, short-circuit and over-temperature protection.

200A at 12V DC

Contact us to discuss your requirements of llvd and blvd. Our experienced sales team can help you identify the options that best suit your needs.

150A at 12V DC

No more stranded vehicles! Avoid the time and expense of getting your vehicles towed. The SureStartTM LVD ensures there's enough power to start, and saves the batteries on vehicles that aren't used every day.

Specifications

• 6.0"L x 5.1"W x 3.0"H (152.4 x 130.2 x 76.2mm).
• Environmental: -40˚C to 85˚C. SAE J & J.
• Electrical: 150A or 200A continuous. Inrush: 500A
• (for 5 seconds). 2mA max quiescent current.
• Ignition-proof to ISO .
• Disconnects when battery drops below 12.1V for 2 minutes, reconnects when battery meets or exceeds 13.0V for 10
• seconds. (Factory programmable).
• Alarm: Active low, 50mA.
• Activates 1 minute before disconnect. (Factory programmable) Accuracy: ±100mV.
• Electronics sealed to IP67.

LVD Accessories

-06 Rocker Switch
Mom On-Off-On SPST switch for use with LVDs. Uniform with series & switches on page 4. Use with .
Harness
Harness kit (Deutsch connector & wires) fits
Compact LVD.
Milliamp Rocker & Alarm
Digital switch with piezo alarm. Use with and .

Battery Management

1- BLVD : Battery Low Voltage Disconnection. 2- LLVD: Load Low Voltage Disconnection. The electrical equipments in sites is divided into two categories: critical equipment (transmission) & non-critical equipment(BTS). for example the critical equipment such as transmission equipment in site high cascade It is important to keep the transmission devices running for as long as possible When the power is cut off it is logical that we want to keep the critical equipment supplied with power for a longer period of time and this is what it does LLVD & BLVD Where a LLVD contactor disconnects the DC current from BTS and BLVD contactor It is still working and extending transmission devices with power from batteries. How the rectifier works: 1- AC power reaches the PSU (Power Supply Unit) which it converts AC to -48V DC. 2- Batterise being charged and When the AC input voltage is interrupted, the battery pack begins to discharge. 3- When the voltage is reached to the set value in the configuration for LLVD contactor, the LLVD contactor disconnect the non-critical equipment (BTS) and goes out of the circuit. 4- The BLVD is still working and the batteries continue to discharge while powering critical equipments (transmission). 5- When the batteries voltage drops to the Disconnect Voltage value, the BLVD will cut off all the load to protect the batteries pack over discharge phenomenon.

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