The Macromatic CAH05A2BH is a current sensing relay. This encapsulated relay has an input voltage of 120V. It monitors for either over or undercurrent conditions and has an output of 10A SPDT. It is made for AC current, and has an adjustable range of 0.5-5A with a trip time delay of 0.5-50 seconds. There is a 5 second time delay on startup. The integrated current transformer promotes better access and sensitivity, as the wire can be looped more than once. The encapsulated housing makes it perfect for use in harsher environments. Note: Image is an approximation. Actual part may differ.

Specifications

• Relay Function- Over/undercurrent
• Current Monitor Range- 0.5-5A
• Time Trip Delay- 0.5-50 seconds
• Sensing Time Delay on Startup- 5 Second
• 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% 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 Amp @ 240VAC, General Purpose; 8 Amp @ 28VDC, Resistive; 1/4HP @ 120/240VAC; B300
• Life- Mechanical: 10,000,000 Operations, Full Load: 100,000 Operations
• Mounting- Surface mount with two #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 user chooses whether the relay checks for over or under current faults by means of a selector switch. The relay starts monitoring for possible faults once the input voltage is introduced. In an overcurrent situation, the AC current goes over the set Fault Trip Current for longer than the adjusted time delay. The relay energizes after the time delay and stays energized until the current drops below the reset level. For an undercurrent error, the current falls below the set Fault Trip Current for longer than the time delay. Again, the relay energizes after the time delay and de-energizes once the current rises above the reset level. The CAH05A2BH has an LED which glows red to indicate when a fault is detected. Has pilot duty rating. Examples of common applications include process control, monitoring for locked rotor or load loss, or open heater or lamp

Macromatic CAH Series Relay Installation Manual

CAH05A2BH Macromatic Relay for Over/Under Current Faults