CAH20A8BD

May not be exact product—for reference only.

  • CURRENT SENSING RELAY
  • 2 - 20A
  • TRIP DELAY: 0.5 - 50 SEC.
  • SENSING DELAY ON STARTUP: 1 SEC.
  • 24V AC/DC
  • 10A SPDT
Description Of Function

Overcurrent 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 above the Fault Trip Current setting & remains above 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 below the Reset level.

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.

Function Chart
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: 2-20A
    Type: Toroidal, through hole wiring
    Setting Accuracy: Min: +0%, -50%; Max: +10%, -0%
    Maximum Allowable Current: Steady-50A Turns; 300A Inrush for 10 Seconds
    Trip Point Hysteresis: -5% Overcurrent sensing +5% Undercurrent sensing
  • Response Times:
    Trip Delay (Relay ON): See Table Above
    Sensing Delay on Start-up: See Table Above
    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: (Storage) -40° to 85° C (-40° to 185° F); (Operating) -28o to 65o C (-18o to 149o F)
  • Approvals:

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Dimensions - Inches (Millimeters)
Macromatic Distributor Stock Status
  • Newark Distributor Part #: 40T0227 Info/Buy

  • Galco Distributor Part #: CAH20A8BD Info/Buy

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©2019 Macromatic Industrial Controls, Inc.

W134N5345 Campbell Drive
Menomonee Falls, WI 53051

800-238-7474 • 262-781-3366

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