The Macromatic CAH05A8AD is a current sensing relay. This encapsulated relay has an input voltage of 24V AC/DC. It checks for over or undercurrent conditions 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 0.15-7 seconds. There is a 1 second sensing time delay on startup. The integrated current transformer adds easier access and greater sensitivity, as the wire can be looped around more than once. The encapsulated housing is perfect for more demanding environments. Note: Image is an approximation. Actual part may differ.

Specifications

• Relay Function- Over/undercurrent
• Current Monitor Range- 0.5-5A
• Time Trip Delay- 0.15-7 seconds
• Sensing Time Delay on Startup- 1 Second
• Input Voltage- 24V AC/DC
• 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% Overcurrent sensing +5% Undercurrent sensing
• 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

The relay has a switch that allows the user to select whether the relay monitors over or under current conditions. The relay starts monitoring for possible faults once the input voltage is introduced. For an overcurrent fault, it occurs when the AC current goes above the set Fault Trip Current for a longer period than the adjusted time delay. The relay energizes after the time delay and stays energized until the current goes below the reset level. For an undercurrent condition, the current goes under the set Fault Trip Current for longer than the time delay. Again, the relay energizes after the time delay and will de-energize once the current goes above the reset level. The CAH05A8AD features an LED indicator which glows red to display when a fault is detected. Has pilot duty rating. Application examples include process control, checking for locked rotor or load loss, or open heater or lamp.

Macromatic CAH Series Relay Installation Manual

Macromatic CAH05A8AD Encapsulated 24V Current Sensing Relay