SEG – XUF1 – DC Voltage Monitoring Relay, 100–500 V DC, DIN-Rail

The SEG (Woodward) XUF1 is a precision digital relay for DC voltage supervision, suited for applications like UPS battery systems, intermediate DC circuits, and starter battery monitoring. It features separate under‑ and over‑voltage protection with fine adjustment, LEDs for indication, and a versatile auxiliary supply (36–520 VAC or 50–750 VDC), all packaged in a compact DIN-rail unit .

Key Features:

• Model: XUF1 (SEG Professional Line)

• Voltage Ranges: 100–500 V DC (XU1‑DC‑1), also variants for 24–60 V DC 

• Protection Elements: Independently adjustable undervoltage (U<) and overvoltage (U>) thresholds with fine/coarse settings 

• Delay Settings: DIP‑switch time multipliers; coarse/fine adjust potentiometers for time delays 

• LED Indicators: “ON,” flashing LEDs for pickup, solid for trip states 

• Test Function: Manual hardware test via 5 s push‑button 

• Auxiliary Supply:

– 36–520 VAC or 50–750 VDC via A1–A3

– Lower range version uses 19–55 VDC via A1–A2 

• Relay Outputs: Two changeover contacts, 5 A @ 250 VAC, 24 VDC inductive rating()

• Mounting: 35 mm DIN‑Rail, transparent sealable cover, IP40