The Macromatic CUH05A2BG is a current sensing relay. This encapsulated relay has an input voltage of 120V AC. It monitors for under current conditions and has an output of 10A SPDT. It checks AC current, with an adjustable range of 0.5-5A and a trip time delay of 0.5-50 seconds. There is a 4 second sensing time delay on startup. The built-in current transformer promotes easy access and greater sensitivity. The encapsulated casing makes it perfect for use in harsher environments. Note: Image is an approximation. Actual part may differ.

Specifications

• Relay Function- Undercurrent
• Current Monitor Range- 0.5-5A
• Time Trip Delay- 0.5-50 seconds
• Sensing Time Delay on Startup- 4 seconds
• Input Voltage- 120V AC
• Output- 10A SPDT
• Input Voltage Tolerance- +10/-15% of nominal
• Load- 2VA
• Current Sensing- 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%
• Response Time- Time Delay on Reset (Relay OFF): 100ms
  Reset Time: 400ms
• Operating Temperature- -28 C to 65 C (-18 F to 149 F)
• Storage Temperature- -40 C to 85 C (-40 F to 185 F)
• 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
• Mounting- Surface mount with 2 #6 screws
• Termination- 0.25" male quick-connect terminals
• Overall Dimensions- 3.5" Height x 2.5" Width x 1.5" Depth
• Approvals- UL & CUL Recognized

Once the input voltage is introduced and the startup time delay has passed, the relay starts checking for faults. For an undercurrent situation, the current needs to go below the set Fault Trip Current for a longer period than the adjusted time delay. The relay energizes after the time delay and will de-energize once the current goes back above the reset level. The CUH05A2BG features an LED indicator which glows red to show if an undercurrent is detected. Has pilot duty rating. Useful applications include process control, monitoring for locked rotor or load loss, and open heater or lamp.

Macromatic CUH Series Relay Installation Manual

Under Current Sensing Relay with 4 Second Delay CUH05A2BG