Newmar LVD 48-30 Low Voltage Disconnect 48V DC 30A Positive Ground (NEW In Box)

The Newmar LVD 48-30 is a 48 volt, 30 amp low voltage disconnect from Newmar Powering the Network in California. It protects a 48 volt battery bank from over discharge damage, which is the usual requirement at telecom and network sites running battery backed DC plant. The unit wires in series in the load leg between the battery and the load, with a separate sense wire to the battery terminal so it measures true terminal voltage rather than voltage depressed by load current.

When the bank falls to the disconnect setpoint the internal contactor opens and sheds the load, stopping the discharge before the cells are permanently damaged. It stays open, drawing only its small standby current, until a charge source lifts the bank to the higher reconnect setpoint, then closes automatically. The hysteresis between the two setpoints prevents the contactor cycling as the bank sags and recovers. Both setpoints are adjustable through the cover.

Specifications

Brand: Newmar Powering the Network

Model: LVD 48-30

Part Number: LVD 48-30

Alternate Part Number: 490-3270-2 REV -1

Product Type: DC low voltage disconnect, battery over discharge protection

Nominal System Voltage: 48 V DC, positive ground

Maximum Continuous Current: 30 A

Factory Disconnect Setpoint: 42.0 V DC

Factory Reconnect Setpoint: 49.0 V DC

Disconnect Adjustment Range: 42 to 60 V DC

Reconnect Adjustment Range: 38 to 60 V DC

Quiescent Draw, Load Connected: 0.10 A

Quiescent Draw, Load Disconnected: 50 mA maximum

Terminals: Studs with supplied ring lugs, 2 x quarter inch for input and output, 1 x number 10 for sense

Sense Circuit Protection: 1 A fast blow fuse

Indicator LEDs: None

Alarm Contacts: None

Mounting: Wall, bulkhead or mobile via case flanges, horizontal or vertical

Enclosure: Vinyl clad aluminium, electrically isolated case

Operating Temperature: 0 to +50 degrees C

Dimensions: Approximately 133 x 133 x 89 mm (5.25 x 5.25 x 3.5 in)

Unit Weight: Approximately 0.45 kg

Serial Number: 16460013

Country of Origin: United States of America

Condition: New, in the original box

Key Features

• Protects a 48 V battery bank from deep discharge damage
• Positive ground design, matching standard telecom DC plant practice
• Both disconnect and reconnect setpoints adjustable on board
• Separate sense lead reads true battery terminal voltage under load
• Automatic reconnection once the bank recovers, no manual reset
• Very low 0.10 A operating and 50 mA standby draw
• Rugged vinyl clad aluminium case, isolated for mounting on any surface
• Made in the USA

Typical Applications

• 48 V telecom and network site battery banks
• Radio, microwave and repeater sites with DC backup
• Off grid 48 V solar battery systems
• Any 48 V load that must be shed before the battery is damaged

Package Includes

• 1 x Newmar LVD 48-30 low voltage disconnect
• 2 x quarter inch ring lugs for input and output
• 1 x number 10 ring lug for the sense connection
• Rubber insulating boots
• No cabling, battery or mounting hardware is included

Additional Information

This is a positive ground unit. The switched leg and the sense polarity are inverted relative to Newmar's 12 V and 24 V models, so the sense wire runs from battery positive to the LVD positive sense terminal. It is not interchangeable with the negative ground models in wiring topology. Please confirm your system is positive ground before ordering.

A low voltage disconnect is battery protection, not load protection. It responds to voltage, not to overcurrent, so it is not a circuit breaker and does not replace one. Fusing or breaker protection is still required.

Newmar does not assign an IP or NEMA rating to the LVD series, so this should be treated as an indoor or protected enclosure product. There are no status LEDs and no alarm or dry contact outputs on this model.

The LVD 48-30 remains a current Newmar product, though Australian distribution is thin and most stock in this market is imported from the United States.

Installation must be carried out by a suitably qualified person.

The item is new in the manufacturer's original packaging.

Shipping from Sydney, Australia.