Features: Standard modular structure, guide rail type installation Real-time monitoring of dc overvoltage and undervoltage faults No additional auxiliary power supply is required Both over - voltage and under - voltage value can be adjusted Action time can be adjusted 2 sets of normally open and normally closed contacts 2 indicator lights indicate various working conditions Typical applications: dc motor, battery,UPS power supply, dc switchgear, dc panel, industrial control system Specification: Protection function: over voltage, under voltage Model: DVRD - 12/24/36/48(Optional) Rated voltage: DC 12V/24V/36V/48V(Optional) Monitoring circuit: direct current circuit Protection function: over voltage, under voltage Overvoltage regulation range: DC 12V: 13-17V DC 24V: 26-34V DC 36V: 39-51V DC 48V: 52-68V Undervoltage adjustment range: DC 12V: 10-14V DC 24V: 20-28V DC 36V: 30-42V DC 48V: 40-56V Action delay range: 0.1-15s Display mode: normal, action 2 LED lights indicate the working status Contact form: 2 set of normally open and normally closed contacts Contact capacity: 6A 250VAC (resistivity) Installation: 35mm guide rail Overall dimension: Approx. 79 * 23 * 79mm / 3.1 * 0.9 * 3.1in Weight: 200 g / 7.1 oz(approx.) Package list: 1 x Overvoltage Undervoltage Protector .Note: Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.