Current Sensing Relays Series
May not be exact product – for reference only.
CUH50A8BF
Lead Time:Â
10
Days
Undercurrent Only
10A SPDT
5 – 50A
0.5 – 50 Sec
3 Sec
Encapsulated
function
Undercurrent Only
control voltage
24V AC/DC
output:
10A SPDT
CURRENT RANGE
5 – 50A
TRIP DELAY
0.5 – 50 Sec
SENSING DELAY ON POWER
3 Sec
ENCLOSURE STYLE
Encapsulated
$139.16
Description of Function
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
Product Overview
Features:
Detects Undercurrent only Monitors single phase AC current Three separate adjustable Fault Trip Current ranges covering 0.5 – 50 amperes 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
Configuration / Contact Rating:
SPDT • 10 Amperes @ 240VAC, General Purpose; 8 Amperes @ 28VDC, Resistive; 1/4HP @ 120/240VAC; B300
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:
Operations
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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