Selectron – GZU 20/21 – Universal 11‑Pin Timer Relay 0.05 s–320 min (220 V)

The Selectron GZU 20/21 is a versatile universal time-delay relay in an 11-pin plug-in format, offering a broad timing range and robust contact capacity suitable for industrial control panels. Featuring a visible rotary dial and built-in LED, it enables precise timing control from fractions of a second up to several hours, housed in a compact rectangular case.

Key Features:

• Model / P/N: GZU 20/21 (Selectron GZ series)

• Coil Voltage: Typically 220 VAC (variants exist for 110 VAC)  

• Timing Range: 0.05 s to 320 min, across multiple scale bands

• Contacts: 11-pin relay configuration, rated 250 VAC at 5 A (1.4 A for inductive loads)  

• Indicators & Controls:

  • Rotary potentiometer dial with labeled scale

  • Internal LED shows coil activation

• Housing:

  • Dimensions: 38 × 86 × 76.5 mm

  • Weight: ~0.2 kg  

• Condition: Typically offered as used or surplus unit from industrial sources