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 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.

• Monitors AC single phase currents for undercurrent conditions
• Adjustable time delay of 0.1-10 seconds on drop-out
• 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
• Choice of compact 8 Pin SPDT or 11 Pin DPDT plug-in case
• 10A output contacts

Application Data

Input Voltage Tolerance:
AC Operation: +10/-15% of nominal at 50/60 Hz.

Load (Burden): Less than 5VA

Current Settings:
Pick-up: Fixed at 105% of drop-out setting
Drop-out: Adjustable throughout current range monitored

Temperature: -28^o to 65^oC (-20^o to 150^oF)

Response Times:
Pick-up: 100ms
Drop-out: Adjustable 0.1 - 10 seconds

Output Contacts:
10A Resistive @ 240VAC/30VDC, 1/2HP @ 240VAC (N.O.), 1/3HP @ 240VAC (N.C.)

Life:
Mechanical: 10,000,000 operations
Full Load: 100,000 operations

Indicator LED: Green when Input Voltage is applied; Red when Relay is energized

Reset: Automatic

Mounting: Requires an 8 or 11 pin octal socket--see Sockets & Accessories.

Approvals:

Dimensions