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To ensure accuracy, please note that images may be representative. Refer to the product data sheet for detailed specifications.
| Manufacturer | Macromatic |
| Manufacturer Product Number | CUH20A8BJ |
| Description | Current Monitor Relay; AC Undercurrent; 2...20 A; 24V AC/DC |
| Datasheet | Download Datasheet |
The Macromatic CUH20A8BJ is a current monitor relay with SPDT output and rated 10 A at 240 V AC general purpose, 8 A at 28 V DC resistive, driven by a 24V AC/DC input.
It watches the monitored current for AC undercurrent.
The current is sensed by a toroidal current transformer (through-hole).
Its trip point adjusts anywhere across 2 to 20 A.
It begins sensing 6 s after power is applied.
It trips after 0.5 to 50 s (adjustable).
It is encapsulated for protection in harsh environments.
It has Surface Mount mounting and Quick Connect - 0.250" (6.3mm) terminals.
| Category | |
| Manufacturer | Macromatic |
| Monitoring Function | AC Undercurrent |
| Sensor Type | Toroidal current transformer (through-hole) |
| Selector Switch | No |
| Setting Adjustment | Analog |
| Current Range | 2...20 A |
| Construction | Encapsulated for protection in harsh environments |
| Input Voltage | 24V AC/DC |
| Input Operating Range | +10%/-15% of nominal |
| Trip Delay | 0.5...50 s adjustable |
| Sensing Delay on Power-Up | 6 s |
| Setting Accuracy | maximum setting +10%/-0%, minimum setting +0%/-50% |
| Hysteresis | +5% |
| Reset Delay | 100 ms, with a 400 ms full reset time |
| Reset Method | Automatic |
| Status Indicator | Red steady when a fault occurs |
| Contact Configuration | SPDT |
| Number of Poles | 1 |
| Output Rating | 10 A at 240 V AC general purpose, 8 A at 28 V DC resistive |
| Mounting Type | Surface Mount |
| Termination Style | Quick Connect - 0.250" (6.3mm) |
| Rated Power | 2 VA |
| Operating Temperature (Storage) | -28...+65 °C (-40...+85 °C) |
| Mechanical Life | 10,000,000 |
| Electrical Life | 100,000 |