Voltage sensing relay to turn equipment on or off based on voltage.  

Battery protection – to disconnect loads when the batteries are low at the voltage you set,
Dump load – connect to one of our 200A relays to turn on a dump load when the batteries are full at the voltage you set,
Warning – connect to a warning light or sound buzzer to turn on at set voltage.
Auto switch battery banks – connect to our solenoids and auto switch battery banks at a set voltage.

The relay is 10A but you can connect it to one of our larger 200A relays to control larger loads.

This controller, with LED digital display, adopts high-quality components and fully automatic SMT process for good performance. It has 1 voltage detection channel and a set of relay switch output(normally open and normally closed).

Features:
LED digital display, mounting boss on the case, convenient and simple for user’s needs.
Procedures for intelligent control, realise over-voltage/under-voltage function.
Wide range of working power: DC 8-35V; the voltage detection range is DC 0-99.9V. (can use on 48V battery bank if you power the controller via a 48v to 12v converter)
Adjustable input voltage detection sensitivity: 0.1-0.9s.
The relay output timing range is 0-999s.
To ensure stability, use industrial grade PCB board.

Working Modes Selection: 
P-1: Delay Setting(set the delay time and pull time);
P-2: Voltage Detection Control(detect the voltage to control the relay operation, initial release);
P-3: Voltage Detection Control(detect the voltage to control the relay operation, initial pull);
P-4: Over-voltage/under-voltage Control(voltage limit alarm).

Specifications:
Operating Power: DC 8-35V
Voltage Detection Range: 0-99.9V ±0.1V
Detection Sensitivity: 0.1-0.9s
Timing Range: 0-999s
Contract Load: 10A/277V AC  10A/30V DC
Contract Resistance: ≤100mΩ(1A 6V DC)
Mechanical Durability: >10 millions
Electricity Durability: >100,000 (10A-250V AC)
Standby Current: 15mA/12V
Min. Current(Close the Nixie Tube): 6mA/12V
Relay Pull-in Current: 45mA/12V
Operating Temperature: -40~85°C
Dimension: 78 * 53 * 30mm / 3.07 * 2.08 * 1.18in
Weight: 74g / 2.61oz

Manual available here