Current Monitoring Relays of 2025
Best Choice1
Veris IndustriesVeris,Current Switch and SPST Relay,N.O., H735
Main highlights- These units combine a current switch and relay into a single package, reducing the space required for total control of fans and pumps.
- These devices allow start/stop control and status monitoring with one device instead of two.
- The current switch and relay operate independently of one another.
- The Hawkeye Relay Combination Series is the ideal solution for the automation installer.
9.9Exceptional
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Value for Money2
MECCANIXITYMECCANIXITY Miniature Current Switch 8-35V 0-50A DC Current Sensing Switch Sensor Monitoring Relay Adjustable Normally Open/Normally Close, D360
Main highlights- The DC current sensing switch uses the principle of mutual induction to sense AC, isolate DC current, and output a normally open or normally closed switch signal. Compared with traditional transformers, thermal protectors, etc., it can detect and control more accurately and timely.
- Please select the appropriate current size before purchasing.(The product comes with instructions)
- Normally open: When the through-current is lower than the set value (the cutoff point is adjustable), the disconnection signal is always output; when the through-current is greater than the set value, the closing signal is output. Normally closed: When the through-current is lower than the set value (cutoff point is adjustable), the closed signal is always output; when the through-current is greater than the set value, the open signal is output.
- LED indication: When the current is lower than the set value, the green signal light is on; when the current is greater than the set value, the red signal light is on; ABS material: The sensor monitoring relay shell uses ABS fireproof material, which is heat-resistant, high in impact strength and stable in performance. High performance: the number of switch opening and closing is unlimited, the response speed is extremely fast, and the response time is <200ms
- Current monitoring relay type: normally open/normally closed; Rated load: 0.3A@240V AC/DC; Monitoring current: 0-50A DC; Auxiliary voltage: 8-35V; Response time: <200ms.
9.7Exceptional
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3
CrocSeeCrocSee Miniature Current Switch, CS-TS0, Normally Open Amp Sensor Monitoring Relay, AC 1-50A Detectable
Main highlights- Self-powered, no external power supply required
- NOTE: If you want to test the operation of the sensor switch, a load must be applied across the NO contacts; otherwise, it will not work.
- N.O. Universal Outputs: 2.5A @ 120 VAC/240VAC; In 240V circuit, only one 120V hot line is connected.
- Faster Response Time: Once current flow is detected, it closes a set of contacts immidiately; Response Time: ≤200ms
- Accurate & Dependable: Offers a sensing range of 1 to 50 amps and universal, solid-state outputs; Accuracy: 1%
9.6Exceptional
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4
YWBL-WHAC Current Sensing Switch 0.2~30A Self-Powered Current Sensor Monitoring Relay (Normally Open)
Main highlights- Widely used in substation, frequency control device, inverter device, electrolytic plating, electric locomotive, street lamp monitoring, coal mine and other need current monitoring automation industry.
- Using the electromagnetic mutual inductance principle of current, the advanced switch output detection, monitoring and alarm type products without power supply technology are adopted.
- The current sensing switch is for , convenient monitoring or detecting the current of electric equipment. An ideal choice for automatic industrial control equipment and electric power monitoring.
- Controlling of various automatic industrial control equipment, flash, buzzer, relay, single chip, or other power load equipment.
- Compared with traditional transformer and thermal protector, it has the advantages of high accuracy, stable performance and long service life.
9.4Excellent
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5
nodehawkCurrent Sensing Relay AC Current Sensing Switch 0-30A Normally Closed Current Sensor Monitoring Relay (N30)
Main highlights- Universal Outputs: Input through current: 0.2-30A AC Rated load: 0.3A@240V AC/DC.
- Normally open current sensor:Suitable for AC current measurement and monitoring, AC motor overload protection, electronic switch of automatic control system and so on.
- Mutual inductance current monitoring,security isolatino of input and output,Self-powered,adjustable with a potentiometer.LED indicator can conveniently and intuitively indicate the working status of the switch.
- Faster Response Time: Once current flow is detected, it closes a set of contacts immidiately; Response Time: ≤200ms
- Accurate & Dependable: Offers a sensing range of 0.2 to 30 amps and universal, solid-state outputs; Accuracy: 1%
9.3Excellent
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6
nodehawkCurrent Sensing Relay AC Current Sensing Switch 0-50A Normally Closed Current Sensor Monitoring Relay (M3050)
Main highlights- Upgrade: Compared with traditional transformers, thermal protectors and other devices, using this device can not only get more accurate and timely control, but also greatly simplify the design and reduce costs. Self-powered, no external power supply required. Input through current: 0-30A AC Rated load: 0.3A@240V AC/DC.
- Multi-Purpose: M-3050 AC current sensing switch is specially designed and manufactured to solve AC current monitoring. It uses the principle of mutual inductance to sense AC direct current, isolate the AC current, output normally open or normally closed switch signals, and directly control various automated industrial equipment, such as flash lamps, buzzers, relays, microcontrollers or other power load equipment.
- LED Indication: The action current is 0-30A AC, which can be adjusted by the potentiometer. The LED indicator light can easily and intuitively indicate the working status of the switch.
- High Performance: The switch has no limit on the number of times of opening and closing, and the response speed reaches the millisecond level. The hysteresis is less than 1% and can be used under strong magnetic conditions. Through structure design, isolation withstand voltage up to 2000V.
- ABS material: High-power MOS tube non-contact electronic switch is used, and the shell is made of self-extinguishing material ABS, which is heat-resistant, acid-alkali-resistant, high impact strength and stable in performance.
9.0Excellent
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7
HilitandCurrent Sensing Switch, Normally Open Current Sensing Relay Adjustable AC 0.2A -30A (SZC23 No AL-CH Model)
Main highlights- The switch has no limit on the number of opening and closing, and the speed reaches the ms level.
- Self-powered, no external power supply required.
- LED indicator can conveniently and intuitively indicate the working status of the switch.
- High-power MOS tube contactless electronic switch.
- Action current 0.2-30A AC, adjustable with a potentiometer.
8.9Very Good
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8
WalfrontDPA51CM44 3 Phase Monitoring Relay Current Voltage Monitoring Relay Phase Sequence Protector 208-480VAC Phase Sequence Protector with Indicator for 3 Phase Motor
Main highlights- Work Well: DPA51CM44 3-Phase Monitoring Relay features with strong anti-interference performance, so it helps maintain a constant and efficient work of the motor, it will provide an excellent performance during the working process
- Small Size: This 3-Phase Monitoring Relay has a small compact size for easy and convenient use and install, and the size of the Monitoring Relay is 8.1 x 6.7 x 1.75 cm/3.1 x 2.6 x 0.6 inch, you can install it on any places around the room, saving a lot of place
- Multi-functioanl: This DPA51CM44 3-Phase Monitoring Relay has a widely use on the electric filed, and it can be applied to motor , elevator, air conditioning system, power system and other industries, very helpful tool during daily life
- LED Indication: This DPA51CM44 Monitoring Relay features an LED indication for easier installation and trouble shooting, which permits a maximum degree of to be achieved for machines, plants and systems, and avoid far more significant subsequent damage, very convenient and useful
- 3-Phase Design: This Current Monitoring Relay is designed with 3-Phase Monitoring Relay to provide a correct phase sequence, without neutral, phase Loss and Incorrect phase sequence, so it can detect when all phases are present and have the correct sequence
8.6Very Good
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9
Tyenaza3-Phase Monitoring Relay, Current/Voltage Monitoring Relay Phase Sequence Protector for Three-Phase System, Without Neutral(GRV8-04,M460)
Main highlights- 【Rated Voltage】: Rated Voltage up to 552AC Voltage measurement accuracy<1%.
- 【LED Indicator】The working status of the voltage control relay is indicated by the LED indicator.
- 【High Accuracy】: The voltage relay has 8 adjustable rated voltages, and the voltage measurement accuracy is less than 1%.
- 【Application】: Equipment protection and control (tower cranes, elevators, agricultural equipment, refrigerated trucks); prevent reverse operation of equipment; normal/emergency power switch; prevent phase failure of dynamic loads.
- 【3-Phase Design】: This Current Monitoring Relay is designed with 3-Phase Monitoring Relay to provide a correct phase sequence, without neutral, phase Loss and Incorrect phase sequence, so it can detect when all phases are present and have the correct sequence
8.5Good
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10
MECCANIXITYMECCANIXITY Miniature Current Switch 8-35V 0-300A DC Current Sensing Switch Sensor Monitoring Relay Adjustable Normally Open/Normally Close, D366
Main highlights- The DC current sensing switch uses the principle of mutual induction to sense AC, isolate DC current, and output a normally open or normally closed switch signal. Compared with traditional transformers, thermal protectors, etc., it can detect and control more accurately and timely.
- Normally open: When the through-current is lower than the set value (the cutoff point is adjustable), the disconnection signal is always output; when the through-current is greater than the set value, the closing signal is output. Normally closed: When the through-current is lower than the set value (cutoff point is adjustable), the closed signal is always output; when the through-current is greater than the set value, the open signal is output.
- LED indication: When the current is lower than the set value, the green signal light is on; when the current is greater than the set value, the red signal light is on; ABS material: The sensor monitoring relay shell uses ABS fireproof material, which is heat-resistant, high in impact strength and stable in performance. High performance: the number of switch opening and closing is unlimited, the response speed is extremely fast, and the response time is <200ms
- Delay function: The current sensor can be set with a power-off delay, which can be adjusted within 0~100 seconds; clockwise delay increases, counterclockwise delay decreases.(The product comes with instructions)
- Current monitoring relay type: normally open/normally closed; Rated load: 0.3A@240V AC/DC; Monitoring current: 0-300A DC; Auxiliary voltage: 8-35V; Response time: <200ms.
8.3Good
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