The Macromatic CAH05A2BC is a current sensing relay. This encapsulated relay has an input voltage of 120V. It can monitor for either over or undercurrent errors and has an output of 10A SPDT. It checks AC current, featuring an adjustable range of 0.5-5A and a trip time delay of 0.5-50 seconds. There is no time delay on startup. The built-in current transformer creates better access and sensitivity, as the wire can be looped more than once. The encapsulated housing makes it ideal 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- 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% 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 can choose whether the relay monitors for over or under current conditions with the selector switch. The relay starts checking for possible faults once the input voltage is introduced. For an overcurrent situation, this occurs when the AC current goes above 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 situation, the current needs to go 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 rises above the reset level. The CAH05A2BC has an LED indicator which glows red to show when a fault is found. Has pilot duty rating. Application examples include process control, monitoring for locked rotor or load loss, or open heater or lamp.

Macromatic CAH Series Relay Installation Manual

Macromatic CAH05A2BC 120V Current Sensing Relay