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Macromatic
Macromatic CU Series Undercurrent - AC Current Sensing Relays

Macromatic CU Series Undercurrent - AC Current Sensing Relays (Plug-In)
   
The CU Series is used to detect an undercurrent condition. The drop-out current setting is user-adjustable within one of three ranges as shown in the Product Selection Table below. An external current transformer can be used to extend the range beyond 10 amperes.

The pick-up current setting is fixed at +5% of the selected drop-out setting. The relay will energize when the monitored AC current is above the pick-up setting. It will de-energize when the monitored AC current is below the drop-out setting for a period longer than the adjustable time delay (t) of 0.1-10 seconds. This delay prevents nuisance tripping caused by momentary line dips. The relay will energize when the current rises 5% above the drop-out setting.
Macromatic CU Series
Approvals Approvals Approvals
   
Features:
  • Monitors AC single phase currents for undercurrent conditions
  • Three separate current monitoring ranges covering 0.1 - 10 amperes
  • External CT can be used to extend ranges
  • Adjustable Drop-out Setting with Fixed Pick-up Setting
  • Adjustable time delay of 0.1-10 seconds on drop-out
  • LED indicates output relay status
  • Choice of compact 8 Pin SPDT or 11 Pin DPDT plug-in case
  • 10A output contacts
CU Series Graph
 
Click here for specifications and dimensions in .pdf format PDF
SPDT 8 Pin Plug-In
Part Number Pick-Up Setting Drop-Out Setting Input Voltage Current Range Monitored Wiring
Add part number CUP01A68 to your Quote. CUP01A68 Fixed (At +5% of Drop-Out) Adjustable (Across Monitored Range) 24V AC 0.1-1A Diagram 21
Add part number CUP05A68 to your Quote. CUP05A68 0.5-5A
Add part number CUP10A68 to your Quote. CUP10A68 1-10A
Add part number CUP01A62 to your Quote. CUP01A62 120V AC 0.1-1A
Add part number CUP05A62 to your Quote. CUP05A62 0.5-5A
Add part number CUP10A62 to your Quote. CUP10A62 1-10A
 
DPDT 11 Pin Plug-In
Part Number Pick-Up Setting Drop-Out Setting Input Voltage Current Range Monitored Wiring
Add part number CUP01A28 to your Quote. CUP01A28 Fixed (At +5% of Drop-Out) Adjustable (Across Monitored Range) 24V AC 0.1-1A Diagram 22
Add part number CUP05A28 to your Quote. CUP05A28 0.5-5A
Add part number CUP10A28 to your Quote. CUP10A28 1-10A
Add part number CUP01A22 to your Quote. CUP01A22 120V AC 0.1-1A
Add part number CUP05A22 to your Quote. CUP05A22 0.5-5A
Add part number CUP10A22 to your Quote. CUP10A22 1-10A
 
Input Voltage Tolerance: AC Operation: +10/-15% of nominal at 50/60 Hz.
Load (Burden): Less than 5VA
Current Settings (Pick-Up): Fixed at 5% above adjustable drop-out setting
Current Settings (Drop-Out): Adjustable throughout current range monitored
Response Times: Pick-Up: Fixed 100ms
Drop-Out: Adjustable 0.1-10 seconds
Output Contacts: 10A @ 240V AC/30V DC, 1/2HP @ 120/240V AC (N.O.), 1/3HP @ 120/240V AC (N.C.)
Life: Mechanical: 10,000,000 operations
Full Load: 100,000 operations
Temperature: -28° to 55°C (-18° to 131°F)
Indicator LED: Green when Input Voltage is applied; Red when Relay is energized
Reset: Automatic
Mounting: Requires an 8 or 11 pin octal socket