Macromatic - Current Sensing Relay; Over/Under; 120VAC; 2-20A SPDT Adj Trip Dela

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.

Features

• Detects either an Overcurrent or Undercurrent Fault (selectable)
• 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 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 CAH20A:
⁃ 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:
⁃  Range: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
⁃  Range:Time Delay on Reset (Relay OFF): 100ms
⁃  Range: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)

See datasheets for more details

• macromatic - cah20a2ac instruction sheet.pdf