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ABB U5-8 - Under Voltage Release 250 VAC/VDC (6 VA)

ABB
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ABB U5-8 is an undervoltage release accessory from the SACE Isomax family, designed to trip compatible circuit breakers when voltage drops to 35-70% of its rated value for reliable protection and control. It operates with a control voltage of 250 VAC/VDC and consumes 6 VA, allowing the breaker to close when voltage reaches approximately 85% of the rated voltage. Weighing 5 lb, this factory-mounted unit is installed on the left pole of the breaker and cannot be used simultaneously with shunt trips. It is compatible with ABB S3B, S3N, S3H, S3L, S4N, S4H, S4L, S5N, S5H, and S5L frames. This accessory is suitable for industrial and commercial electrical protection applications.

Key Features & Specifications
  • Manufacturer: ABB
  • Item Subcategory: Under Voltage Release
  • Family: SACE Isomax
  • Type: U5
  • Weight: 5 lb
  • Control Voltage Minimum: 250 VAC/VDC
  • Control Voltage Maximum: 250 VAC/VDC
  • Power Consumption: 6 VA
  • Mounting: Left pole mounted, factory installation
  • Function: Trips breaker at 35-70% undervoltage
  • Allows breaker closing at ~85% rated voltage
  • Cannot be used with shunt trip
  • Compatible Frames: S3B, S3N, S3H, S3L, S4N, S4H, S4L, S5N, S5H, S5L