3 Phase Monitoring Relay, SPDT, Phase Failure/Undervoltage/Overvoltage
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Low price 3 phase voltage monitoring relay with SPDT (1 C/O) contact, used for monitoring phase failure/loss, phase sequence, phase unbalance, overvoltage and undervoltage at the rated voltage of AC 220V, 380V, 440V, 460V, or 480V 50/60Hz, LED lights indicating working state, compact size and DIN rail mounting, provide a safe protection for electric motors, air compressors, pumps and other equipment or devices.
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Delivery date: 6-12 days
Three phase monitoring relay with SPDT (1 C/O) contact, performs the monitoring functions including phase loss, phase sequence, phase unbalance, overvoltage and undervoltage in the 3 phase AC power system of 220V AC, 380V AC, 440V AC, 460V AC, or 480V AC 50/60Hz. The phase failure/voltage monitoring relay is widely applied in air compressors, electric motors, pumps, fans, air-conditioning system, blowers, lifts, elevators, cranes, refrigeration units, mining excavators and conveyors, etc.
Features
- Compact size in DIN rail mounting
- Three-phase monitoring of phase sequence, phase loss (phase failure), phase unbalance, overvoltage and undervoltage
- Powered by the measuring circuit
- Monitoring relay with 1 C/O (SPDT) contacts
- 5 LED lights for status indication
Specification
| Model | ATO-JVR | |||
| Measuring Circuit | 3-Phase AC: L1, L2, L3 | |||
| Monitoring Functions | Phase Sequence (Reversal), Phase Loss (Failure), Phase Unbalance Overvolatege, Undervoltage | |||
| Rated Voltage (line voltage) (Optional) | 220V AC, 380V AC, 440V AC, 460V AC, 480V AC 50/60Hz | |||
| Voltage Setting Range (Optional) | Model Suffix | Undervoltage | Overvolatege | |
| Blank | -15% | +15% | ||
| A | -10% | +10% | ||
| B | -10% | +12.5% | ||
| C | -12.5% | +15% | ||
| Voltage Unbalance Threshold | 15% fixed | |||
| Delay Time for Undervoltage & Overvoltage | 5-8s fixed | |||
| Delay Time for Phase Loss, Phase Unbalance, Phase Sequence | 1-2s fixed | |||
| Reset Time | 0.5s fixed | |||
| Indicator | LED indicating phase sequence, phase loss, overvolatege, undervoltage, and normal status | |||
| Output Contacts | 1 C/O (SPDT or 1 Form C) | |||
| Contact Capacity | 3A, 250V AC (resistive load) | |||
| Degree of Protection | IP 20 | |||
| Working Conditions | Operating Temperature | -25℃~65℃ | ||
| Humidity | ≤85%RH, non-condensing | |||
| Mechanical Durability | 1,000,000 cycles | |||
| Dielectric Strength | ＞2kVAC 1min | |||
| Mounting | 35mm DIN rail | |||
| Weight | 110g | |||
| Dimensions (H*W*D) | 68*30*76mm | |||
Wiring Diagram 
Monitoring relay contacts position shown in "Power-off" condition
Dimensions (Unit: mm)
Tips: Working Principle of Phase Sequence Monitoring Relay
Sampling three-phase power supply for processing, when the phase sequence of the power supply matches the phase sequence of the input of the phase sequence monitoring relay, the output of the relay is turned on, and the main control circuit of the device is turned on.
When the phase sequence of the power supply changes, the phase sequence does not match, and the output of the phase sequence monitoring relay cannot be turned on, thereby protecting the device and avoiding accidents. The other type of phase monitoring relay uses digital micro-core technology products, which can realize automatic phase sequence identification and automatic phase sequence conversion to ensure that the motor rotates in a constant phase sequence.
The three-phase power supply is connected to the U, V, W (some are R, S, T or L1, L2, L3) of the monitoring relay in sequence. The phase sequence monitoring relay generally have one normally open and one normally closed auxiliary contacts. For the connection to the control loop, the specific connection of normally open or normally closed contacts should be based on the control principle or wiring diagram. When the phase sequence is wrong or the phase is losing, the auxiliary contact of the relay acts from normally open to normally closed, and normally closed to normally open.
3-Phase Monitoring Relay Phase Failure & Phase Sequence Testing
In this video, we will give you a test of ATO 3-phase monitoring relay on phase failure and phase sequence, and the relay does the job at such these cases to protect the motor. In addition, this multi-purpose monitoring relay has other monitoring functions such as undervoltage, overvoltage, voltage unbalance, timer & counter.
Existing reviews of 3 Phase Monitoring Relay, SPDT, Phase Failure/Undervoltage/Overvoltage
I am interested in your monitoring relay, and would like to ask some questions about it?
I have a solar application that I am looking at using your DC voltage monitoring relay to detect low voltage on our battery array. On the contact side, I would like to either wire it into dry contact or a very low voltage digital input on our controller. Our current application is powered by a 12V source. Can I do that? Also, what is the power consumption of this module during normal operation and when an undervoltage occurrence is in?
From: Rochoa | Date: 03/12/2021
Was this review helpful? Yes No (0/0)
1. Yes, you can do that.
2. The power consumption of this module is ≤2W during normal operation, and when the under-voltage occurs, the power consumption will be smaller than this.
3. You can adjust over-voltage and under-voltage threshold as you like.
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Source: https://www.ato.com/3-phase-monitoring-relay
