Product Description
Description: Current Monitor Relays • Type: Undercurrent • Coil Voltage: 110-120 VAC • Contact Configuration : 1C SPDT • Mounting: Surface Mount • Current Range Monitored: 20 Amps • Trip Delay: 0.150-7 Sec • Sensing Delay On Power Up: 3 Sec • Indicator LED: Red ON Steady when Fault occurs
| Product Information | Resources |
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| Specifications |
| Product Attribute | Attribute Value |
| Type | Undercurrent |
| Coil Voltage | 110-120 VAC |
| Contact Configuration | 1C SPDT |
| Mounting | Surface Mount |
| Current Range Monitored | 20 Amps |
| Trip Delay | 0.150-7 Sec |
| Sensing Delay On Power Up | 3 Sec |
| Indicator LED | Red ON Steady when Fault occurs |
| Input Voltage Tolerance | AC Operation: +10/-15% of nominal at 50/60 Hz. DC Operation: +10/-15% of nominal |
| Load (Burden) | 2VA for all voltages |
| 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 |
| Temperature | Operating: -28o to 65oC (-18o to 149oF) Storage: -40o to 85oC (-40o to 185oF) |
| Mounting: | Surface mount with two (2) #6 screws |
| Termination | 0.25 male quick-connect terminals |
| Series Features |
| CAH, COH & CUH Series AC OVERCURRENT & UNDERCURRENT |
| Series Description: The CxH Series is an AC current sensing relay that is available in three versions: CAH Series--can detect either an overcurrent or undercurrent fault (selectable); COH Series--overcurrent only; and CUH Series--undercurrent only. The current- carrying wire is run through the built-in current transformer and can be looped multiple times for greater sensitivity. These relays include user-adjustable settings for Fault Trip Current & Time Delay on Fault Trip as well as an LED to indicate fault condition. The encapsulated construction offers protection in harsh environments. Applications such as monitoring for locked rotor or load loss condition, open heater or lamp, and process control are perfect for these products. Overcurrent Sensing After input voltage is applied & the sensing delay on power-up (tS) is completed, the unit will begin sensing for a fault condition. A fault will occur when the monitored AC current (I) goes above the Fault Trip Current setting & remains above the Reset level for a period longer than the adjustable time delay period (t). The LED will turn ON immediately and the relay will energize after the time delay on pick-up (t) is completed. The relay will de-energize & the LED will turn OFF when the monitored AC current goes below the Reset level. Undercurrent Sensing After input voltage is applied & the sensing delay on power-up (tS) is completed, the unit will begin sensing for a fault condition. A fault will occur when the monitored AC current (I) goes below the Fault Trip Current setting & remains below the Reset level for a period longer than the adjustable time delay period (t). The LED will turn ON immediately and the relay will energize after the time delay on pick-up (t) is completed. The relay will de-energize & the LED will turn OFF when the monitored AC current goes above the Reset level. |
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