The Macromatic CUH05A2BC is a current sensing relay. This encapsulated relay has an input voltage of 120V AC. It checks for under current faults and has an output of 10A SPDT. It monitors AC current, with an adjustable range of 0.5-5A and a trip time delay of 0.5-50 seconds. There is no sensing time delay on startup. The integrated current transformer provides easy access and greater sensitivity. The encapsulated housing is ideal 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- None
• 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

When the input voltage is introduced, the relay then starts monitoring for faults. For an undercurrent situation, the current needs to go under the set Fault Trip Current for longer than the time delay. The relay energizes after the time delay and will de-energize once the current goes over the reset level. The CUH05A2BC has an LED indicator which glows red to show if an undercurrent fault is detected. Has pilot duty rating. Applications such as process control, monitoring for locked rotor or load loss, and open heater or lamp are all suited for this type of relay.

Macromatic CUH Series Relay Installation Manual

Macromatic CUH05A2BC Under Current Sensing Relay