12 best current monitoring relays

Product description

CrocSee AC Current Switch is designed for AC current monitoring, motor overload protection, automatic control system and other applications. This device senses a current draw of between 1amp and 50 amps and closes a set of contacts while AC current is passing through sensor.



Main Specifications:

Enclosure Dimensions(LxWxH): 88 x 25 x 50mm; Or approx. 3.46 x 0.98 x 1.97 inch

Sensor Hole Diameter: 20mm (0.79 inch)

Mounting Holes: 2x5mm holes spaced 76mm on base (2 x 0.19”holes spaced 3”on base)

Voltage Range: 120-240VAC

Switch Rating: 2.5 A @ 120 VAC/240VAC (Only works with AC current, not for DC current)

Contact Type：Normally Open

Operating Temperature: -20 to 45℃（-4 to 113℉）

Humidity Limits: 0-95% RH, non-condensing

Response Time: ≤200ms

Accuracy: 1%

Hysteresis: ≤1%



NOTE:

1. Disconnect and lock-out all power sources prior to installation.

2. The current switch has a rating of 2.5 Amps maximum. If the secondary device (which is conncted with the switch) draws more than 2.5 Amps, then you will need a separate high current relay.

3. A load must be applied across the NO switch to work. If no load is applied across the NO switch, these NO terminals will not close with correct operating primary current.

4. The switching current is NOT calibratable. However, it is sensitive enough to detect any current draw of between 1amp and 50 amps.



Package includes:

1x AC Current Switch

1x Instruction Manual



Warranty:

1-year free replacement or full refund without return.

If the item you have received is defective in any way, please message us for free replacement or refund without return.

• N.O. Universal Outputs: 2.5A @ 120 VAC/240VAC; In 240V circuit, only one 120V hot line is connected.
• Self-powered, no external power supply required
• Accurate & Dependable: Offers a sensing range of 1 to 50 amps and universal, solid-state outputs; Accuracy: 1%
• Faster Response Time: Once current flow is detected, it closes a set of contacts immidiately; Response Time: ≤200ms
• 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.

User questions & answers

Question:	Will this work switching 1a @ 240vac
Answer:	Yes, it will work switching 1a @ 240vac, but only loop one HOT power wire trough the current sensor.
Question:	Is the sensing current adjustable
Answer:	No.
Question:	Need this to sense ac current and switch 12v dc. Will this work
Answer:	It has a dry set of contacts which close when sensing 1 to 50amps a/c, so weather you are switching a/c or d/c it doesn’t matter as long as you don’t exceed its current rating which is 2.5 amps.
Question:	Would this be able to control the secondary load at 1A @240vac or is that too much for the unit
Answer:	Yes, this current switch is able to control the secondary load at 1A @240vac. In 240V circuit, only one 120V hot line is connected. Also, if the current being meaured is less than 1A, loop the wire through the sensor coil to incease the current field. Cross-core current = actual current X number of loops around sensor coil e.g. If the current draw from the measured device is 0.5 amp, then loop the wire around the sensor coil 3 times and it will produce 1.5A current.

Product description

• Current sensing relay for monitoring electrical current
• Current carrying wire is routed through an aperture
• Magnetic modulator technology for a stable and repeatable current trip
• Variable trip point range with adjustable timer for stability
• UL recognized for safety, CSA certified for quality assurance, and RoHS compliant for hazardous substances

Product description

SZC23 series AC current sensing switch is designed and manufactured to solve the AC current monitoring. It uses the principle of mutual inductance to sense the AC straight-through current, isolate the AC current, and output a normally open or normally closed switching signal to directly control various automation industrial equipment, such as flash, buzzer, relay, single-chip or other power load equipment. Compared with traditional mutual inductors, thermal protectors and other devices, using this device can not only get more accurate and more timely control, but can also greatly simplify the design and reduce costs.

  

Specification:

Model: SZC23-NO-AL-CH

Power supply: Not required

Rated load: ≤ 0.5A@240V AC/DC

Input current: 0.2-30A AC

Switch on minimum: 0.5±0.2A

Maximum overload: 100%

Leakage current: ≤0.1A

Accuracy: 1%

Hysteresis: ≤1%

Response time: ≤200ms

Waterproof: IP30

Dimensions: 65*25*47mm / 2.56*0.98*1.85in

Hole diameter: 10mm / 0.4in

Package weight: Approx. 56g/2.0oz

 

Package list:

1 * Current Sensing Switch

• 【2000V Resistant】The outer casing is made of self-extinguishing material ABS. Straight-through structure design, isolation withstand voltage up to 2000V.
• 【LED Indicator】Self-powered, no external power supply required. LED indicator can conveniently and intuitively indicate the working status of the switch.
• 【Electronic Switch】High-power MOS tube contactless electronic switch. The switch has no limit on the number of opening and closing, and the reaction speed reaches the ms level.
• 【Adjustable】Action current 0.2-30A AC, adjustable with a potentiometer. Hysteresis is less than 1% and can be used under strong magnetic conditions.
• 【Used for】Suitable for AC current measurement and monitoring, AC motor overload protection, electronic switch of automatic control system and so on.

Product description

Only two versions from 2 mA to 10 A. Can be variably set to over range, under range or window monitoring. Freely parameterizable delay times and reset switch. Actual value and fault type are permanently displayed. All of the versions have removable terminals. All of the versions have screw terminals or, alternatively, innovative Cage Clamp terminals

• 22.5 mm wide
• Can be digitally set and with LCD display
• Fault memory that can be switched-in
• Simultaneous monitoring for current over range/under range over the complete measuring range
• Wide-voltage versions reduce stock inventory costs

Product description

Features:

DPA51CM44 3-Phase monitoring relay features strong anti-interference performance. Compact size and convenient for installation. Maintain constant and efficient work of the motor. Widely used in motor protection, elevator, air conditioning system, power system and other industries. 3-phase monitoring relay for phase sequence and phase loss. Detects when all phases are present and have the correct sequence.

Specifications:

Model: DPA51CM44

Contact load: 5A/ 250VAC; 5 A / 24 VDC

Rated current: 5A

Rated voltage: 208-480VAC

Protective features: IP20

3C rated voltage range: below 36V

Measuring range: 208-480VAC

Contact switching voltage: 250V

Contact switching current: 5A

Output: 1*SPDT relay

Maximum load capacity: 5A/250VAC, 5 A / 24 VDC

Electrical life: > 100,000 times

Size: 8.1 x 6.7 x 1.75cm/3.1 x 2.6 x 0.6inch

Package Included:

1 x 3-Phase Monitoring Relay

• 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 protection, elevator, air conditioning system, power system and other industries, very helpful tool during daily life
• 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
• 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
• LED Indication: This DPA51CM44 Monitoring Relay features an LED indication for easier installation and trouble shooting, which permits a maximum degree of protection to be achieved for machines, plants and systems, and avoid far more significant subsequent damage, very convenient and useful

User questions & answers

Question:	Amp rating of 5, Is this referring to the control voltage? In other words the amperage to the coil on the contactor
Answer:	Contact load: 5A/ 250VAC; 5 A / 24 VDC Contact switching current: 5A Maximum load capacity: 5A/250VAC, 5 A / 24 VDC

Product description

The Hawkeye relay combination Series is the ideal solution for the automation installer. These units combine a current switch and relay into a single package, reducing the space required for total control of fans and pumps. The current switch and relay operate independently of one another. These devices allow start/stop control and status monitoring with one device instead of two. made in United States. Manufactured by Vermis Industries.

User questions & answers

Question:	tell me ? Is there any way to check the sensor at which current it works? email me please scheme how to check? I need operating current of 100 amperes
Answer:	I’d guess that BMW doesn’t manufacture these. Try the Bosch website

Product description

• Current sensing relay for monitoring electrical current
• Current carrying wire is routed through an aperture
• Electrical isolation between circuits (SPDT)
• Variable trip point range with adjustable timer for stability
• UL recognized for safety and RoHS compliant for hazardous substances

Product description

SZC23 series AC current sensing switch is designed and manufactured to solve the AC current monitoring. It uses the principle of mutual inductance to sense the AC straight-through current, isolate the AC current, and output a normally open or normally closed switching signal to directly control various automation industrial equipment, such as flash, buzzer, relay, single-chip or other power load equipment. Compared with traditional mutual inductors, thermal protectors and other devices, using this device can not only get more accurate and more timely control, but can also greatly simplify the design and reduce costs.

 

Specification:

Model: SZC23-NO-AL-CH

Power supply: Not required

Rated load: ≤ 0.5A@240V AC/DC

Input current: 0.2-30A AC

Switch on minimum: 0.5±0.2A

Maximum overload: 100%

Leakage current: ≤0.1A

Accuracy: 1%

Hysteresis: ≤1%

Response time: ≤200ms

Repeatability: 100%

Working temperature: -20~60℃

Waterproof: IP30

Dimensions: 65*25*47mm / 2.56*0.98*1.85in

Hole diameter: 10mm / 0.4in

Package weight: Approx. 56g/2.0oz

 

Package list:

1 * Current Sensing Switch

 

Note:

1. Due to the difference between monitors and light effects, the pictures may not reflect the actual color of the item.

2. Please allow slight error due to manual measurement. Thanks for your understanding.

• Self-powered, no external power supply required.Suitable for AC current measurement and monitoring, AC motor overload protection, electronic switch of automatic control system and so on.
• Action current 0.2-30A AC, adjustable with a potentiometer. The outer casing is made of self-extinguishing material ABS.
• LED indicator can conveniently and intuitively indicate the working status of the switch.
• High-power MOS tube contactless electronic switch.
• The switch has no limit on the number of opening and closing, and the reaction speed reaches the ms level.

Product description

Sensor Power Induced from monitored conductor. Insulation Class 600VAC RMS. Temperature Range -15° to 60°C (5° to 140°F). Humidity Range 10 - 90% RH non-condensing. Frequency 50/60 Hz. Terminal Block Maximum Wire Size 14 AWG. Terminal Block Torque (nominal) 4 in-lbs (0.45 N-m). Agency Approvals UL 508 open device listing. Do not use the LED status indicators as evidence of applied voltage.

• The Hawkeye Relay Combination Series combines an on/off status sensor and command relay in one package, saving the labor, wire runs, and space required to mount a separate relay.
• The switch and relay (not electrically connected) are in the same housing, saving space and cost.
• It is ideal for monitoring and controlling motors where belt loss is not a concern.
• Applications include: Monitoring direct drive units, exhaust fans, and other fixed loads. Monitoring on/off status of electrical loads. Starting/stopping motors. On/off status sensors and command relay for direct-drive fans, pumps and process motors. Reduce the number of installed components.

• Self-powered, no external power supply required.Action current 0.2-30A AC, adjustable with a potentiometer.
• LED indicator can conveniently and intuitively indicate the working status of the switch.Hysteresis is less than 1% and can be used under strong magnetic conditions.
• The switch has no limit on the number of opening and closing, and the reaction speed reaches the ms level.The outer casing is made of self-extinguishing material ABS.
• High-power MOS tube contactless electronic switch.Straight-through structure design, isolation withstand voltage up to 2000V.
• Suitable for AC current measurement and monitoring, AC motor overload protection, electronic switch of automatic control system and so on.

User questions & answers

Question:	Can this be used to shut off a 12 volt DC linear actuator if it gets jammed
Answer:	I have one USE in perfect condition for $150

Product features

Good Choice

SZC23 series AC current sensing switch is designed and manufactured to solve the AC current monitoring. It uses the principle of mutual inductance to sense the AC straight-through current, isolate the AC current, and output a normally open or normally closed switching signal to directly control various automation industrial equipment, such as flash, buzzer, relay, single-chip or other power load equipment.

Compared with traditional mutual inductors, thermal protectors and other devices, using this device can not only get more accurate and more timely control, but can also greatly simplify the design and reduce costs.

Product description

Parameter:

Product Name: 0-5A AC Current Detection Sensor Module

Output mode: relay switching output.

Relay load: AC 250V 10A Max , DC 30V 10A Max.

Operating voltage: DC 5V / 12V / 24V ± 0.2V. (Select the corresponding version of the product according to your needs).

Working current: <10mA.

Response time: <50ms.

Induction sensitivity: Potentiometer is adjustable.

The overcurrent signal setting is adjustable and the resolution is set to 0.3A.

The main chip: op amp, transformer.

The current detection resolution can be changed by the resistance parameter setting.

With fixed mounting holes.

The main chip: op amp, transformer.

Module size: 48x40x30mm (length x width x height).

Working temperature: -10 - +50 °C.

Working humidity: 5-95% RH.

Application: Intelligent trolley motor over-current detection, motor stall protection current detection, short-circuit protection detection, etc.



Package Included:

1pcs NOYITO 0-5A AC Current Detection Sensor Module

• Current detection range: AC 0-5A.
• Operating voltage: DC 5V / 12V / 24V ± 0.2V. (Select the corresponding version of the product according to your needs).
• Output mode: relay switching output.
• Relay load: AC 250V 10A Max , DC 30V 10A Max.
• Application: Intelligent trolley motor over-current detection, motor stall protection current detection, short-circuit protection detection, etc. (The second picture on the left is the schematic and the third picture is the wiring diagram)

User questions & answers

Question:	What is the lowest current this can detect and what sort of hysteresis is there? Looking to monitor a solar charging circuit and turn on a small fan
Answer:	Hello, thanks for your message, yes, it is comparable with Samsung TV, TVs generally have HDMI interface. You said "plug from tv larger than hdmi", is it DisplayPort? If so, you have to extra use one HDMI to DisplayPort Converter. Thank you.
Question:	What is the inductor part number
Answer:	No, this will not fit. There are fuel pumps on Amazon for your Honda.
Question:	Noyito, do you have a 0-20 amp dc module? i need 2 of them that will operate on 12 vdc
Answer:	Hi there, This will not fit your application. I believe the Delphi HP10001 is the SKU that will fit your truck Nik B. buyautopartsonline.ca
Question:	Can you make a version with a leaded coil
Answer:	just to make sure, go to rock auto and check the number on their site and match it up with the part on amazon, I used this on a 2001 Silverado with the 5.3

Product description

Specification:

Model: SZC23-NO-AL-CH

Power supply: Not required

Rated load: ≤ 0.5A@240V AC/DC

Input current: 0.2-30A AC

Switch on minimum: 0.5±0.2A

Maximum overload: 100%

Leakage current: ≤0.1A

Accuracy: 1%

Hysteresis: ≤1%

Response time: ≤200ms

Repeatability: 100%

Working temperature: -20~60℃

Waterproof: IP30

Dimensions: 65*25*47mm / 2.56*0.98*1.85in

Hole diameter: 10mm / 0.4in

Package weight: Approx. 56g/2.0oz



Package Included:

1 * Current Sensing Switch



Note:

1. Due to the difference between monitors and light effects, the pictures may not reflect the actual color of the item.

2. Please allow slight error due to manual measurement. Thanks for your understanding.

• Easy To Use: Current sensing switch is self-powered, requires no external power supply, operates at 0.2-30A AC, and can be adjusted with a potentiometer.
• Convenient And Intuitive: The switch does not limit the number of opening and closing, the reaction speed reaches ms level, and the LED indicator can indicate the working state of the switch.
• Accurate And Timely: Current switch is a straight-through structure design with isolation withstand voltages up to 2000V and hysteresis of less than 1%. It can be used under strong magnetic conditions.
• High Quality: High-power MOS tube non-contact electronic switch, the outer casing is made of self-extinguishing material ABS.
• Widely Used: it is suitable for AC current measurement and monitoring, AC motor overload protection, automatic control system electronic switch.

User questions & answers

Question:	will this sense an 24vac line and turn on
Answer:	Hi, this product Rear Trunk Lid Tailgate Back Door Control Module Unit 7335274 7317419 is fit for your bmw x6. Thank you!
Question:	Will this work with 120v as well as 240v
Answer:	Per the 3rd bullet in the description "With 8 Pcs 4.9ft(1.5m) HDMI USB KVM Dedicated Cable, eliminate the troubles you find matching cable, save your time and extra expenses."
Question:	Can it sense 12 VAC door buzzer current
Answer:	Dear Friend, How are you? Thanks you are interested in our TESmart KVM Switch 16 ports kvm switch comes with 8* 4.9ft hdim usb kcm cables This kvm switch is worthy to own Best Regards
Question:	Would this switch be compatible with an Arduino
Answer:	yes, this is pretty laggy and wouldn't be good for gaming.