CUH Series

CUH50A8BH

Lead Time: 10 Days

$131.90 (USD) / EACH

Description Of Function

<p><strong>Undercurrent Sensing</strong><br>After input voltage is applied & the sensing delay on power-up (t<sub>s</sub>) is completed, the unit will begin sensing for a fault condition. A fault will occur when the monitored AC current (I) goes below the Fault Trip Current setting & remains below the Reset level for a period longer than the adjustable time delay period (t). The LED will turn ON immediately and the relay will energize after the time delay on pick-up (t) is completed. The relay will de-energize & the LED will turn OFF when the monitored AC current goes above the Reset level.</p>

Function Chart

Product Overview

Features
  • Detects Undercurrent only
  • Monitors single phase AC current
  • Built-in toroidal through-hole current transformer allows easy access & multiple loops for increased sensitivity
  • Adjustable time delay on fault trip
  • LED indicates fault condition
  • 10A SPDT output contacts
  • Encapsulated for protection in harsh environments
Enclosure Style

Encapsulated 2.5" x 3.5" enclosure with dual screw mounting

Configuration / Contact Rating
  • SPDT
  • 10 Amperes @ 240VAC, General Purpose; 8 Amperes @ 28VDC, Resistive; 1/4HP @ 120/240VAC; B300
Application Information
  • Voltage Tolerance: AC Operation: +10/-15% of nominal at 50/60 Hz.
  • Load (Burden): 2 VA for all voltages
  • Indicator LEDs: Red ON Steady when Fault occurs
  • Current Sensing:
    Range: 0.5-5A
    Type: Toroidal, through hole wiring
    Setting Accuracy: Min: +0%, -50%; Max: +10%, -0%
    Maximum Allowable Current: Steady-25A Turns; 150A Inrush for 10 Seconds
    Trip Point Hysteresis: -5% Overcurrent sensing +5% Undercurrent sensing
  • Response Times:
    Trip Delay (Relay ON): A: 0.150 - 7 Sec; B: 0.5 - 50 Sec; F: Fixed times i.e., F2 = Fixed 2 Sec
    Sensing Delay on Start-up:C: No Delay, D: 1 Sec, E: 2 Sec, F: 3 Sec, G: 4 Sec, H: 5 Sec, J: 6 Sec
    Time Delay on Reset (Relay OFF): 100ms
    Reset Time: 400ms
  • Output Contacts: 10 Amperes @ 240VAC, General Purpose; 8 Amperes @ 28VDC, Resistive; 1/4HP @ 120/240VAC; B300
  • Life: Mechanical: 10,000,000 operations; Full Load: 100,000 operations
  • Temperature: -28° to 65° C (-18° to 149° F)
Approvals
UL #: E109466

Operation

The CUH Series is an AC current sensing relay that can detect undercurrent only. The current-carrying wire is run through the built-in toroidal current transformer and can be looped multiple times for greater sensitivity. These relays include user-adjustable settings for Fault Trip Current & Time Delay on Fault Trip as well as an LED to indicate fault condition. The encapsulated construction offers protection in harsh environments. Applications such as monitoring for locked rotor or load loss condition, open heater or lamp, and process control are perfect for these products.

Undercurrent Sensing

After input voltage is applied & the sensing delay on power-up (ts) is completed, the unit will begin sensing for a fault condition. A fault will occur when the monitored AC current (I) goes below the Fault Trip Current setting & remains below the Reset level for a period longer than the adjustable time delay period (t). The LED will turn ON immediately and the relay will energize after the time delay on pick-up (t) is completed. The relay will de-energize & the LED will turn OFF when the monitored AC current goes above the Reset level.

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