Best Current Monitoring Relays in 2026

Electric relay for controlling electric signals in low current applications

Plug-in/solder terminals for plugging into a socket or soldering contacts

DPDT for simple change-over switching

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.

Screw Terminals

Long Life Contacts

Molded Plastic Barrier Insulation

PRODUCT NAME---Voltage Monitoring Relay; Protection function: over voltage, under voltage; Rated voltage: DC 12V/24V/36V/48V; Overvoltage regulation range: 13-17v; Undervoltage adjustment range: 10-14v; Contact capacity: 6A 250VAC (resistivity)

REAL-TIME MONITORING---The voltage monitoring relay could achieve real-time monitoring of dc overvoltage and undervoltage faults, and over-voltage, under-voltage value, and action time can be adjusted

MAIN FEATURES---The voltage monitoring relay is of 2 sets of normally open and normally closed contacts, 2 indicator lights indicate various working conditions, no additional auxiliary power supply is required

This is a simple and practical passive relay module, which is very convenient to use. It can support both Normally Open and Normally Close.

Input control signal: AC/DC 5V, AC/DC 12V, AC/DC24V, AC/DC48V, AC 115V, AC 230V Selectable.

Output switch DPST 1NO 1NC(Double Pole Single Throw, 1x Normally Open and 1x Normally Close ), rated current 8A/250VAC or 8A/30VDC (one switch).

This is a simple and practical passive relay module, which is very convenient to use. It can support both Normally Open and Normally Close.

Input control signal: AC/DC 5V, AC/DC 12V, AC/DC24V, AC/DC48V, AC 115V, AC 230V Selectable.

Output switch DPST 1NO 1NC(Double Pole Single Throw, 1x Normally Open and 1x Normally Close ), rated current 8A/250VAC or 8A/30VDC (one switch).

This is a simple and practical passive relay module, which is very convenient to use. It can support both Normally Open and Normally Close.

Input control signal: AC/DC 5V, AC/DC 12V, AC/DC24V, AC/DC48V, AC 115V, AC 230V Selectable.

Output switch DPST 1NO 1NC(Double Pole Single Throw, 1x Normally Open and 1x Normally Close ), rated current 8A/250VAC or 8A/30VDC (one switch).

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 speed reaches the ms level.The outer casing is made of self-extinguishing material ABS.

Current sensing relay for monitoring electrical current

Current carrying wire is routed through an aperture

Electrical isolation between circuits (SPDT)

SELF-POWERED: Self-powered, no external power supply required.

CONTACTLESS ELECTRONIC SWITCH: High-power MOS tube contactless electronic switch.

STRUCTURE DESIGN: Straight-through structure design, isolation withstand voltage up to 2000V.

Multi-Purpose: M3050 AC with rails 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.

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.

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.

Weight: 0.67lb

Product Dimensions: 8.00 x 8.00 x 7.00 inches

Condition: Used - Like New

Multi-Purpose: M3080 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.

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: 0-200A AC Rated load: 0.3A@240V AC/DC.

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.

Normally open current sensor: when the perforation line current exceeds the set value, the red light is on and the output signal is a closed; when the current is below the set value, the green light is on and the switch is open

Mutual inductive current monitoring, safety isolation of input and output, self-current monitoring

The range of the monitored current is up to 30 A, the monitoring threshold is adjustable

Universal Outputs: Input through current: 0.2-30A AC Rated load: 0.3A@240V AC/DC.

Accurate & Dependable: Offers a sensing range of 0.2 to 30 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

【Adjustable AC Current】Action current 0.2-30A AC, adjustable with a potentiometer. Straight-through structure design, isolation withstand voltage up to 2000V. Self-powered, no external power supply required.

【Widely Used】Suitable for AC current measurement and monitoring, AC motor overload protection, electronic switch of automatic control system and so on. 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.

【Quickly Responsive】High-power MOS tube contactless electronic switch. The switch has no limit on the number of opening and closing, and the speed reaches the ms level. LED indicator can conveniently and intuitively indicate the working status of the switch.

Dual function — monitors current and motor start and stop

100% solid-state output — has no moving parts to fail

Polarity insensitive output — provides easier wiring

Operating voltage: power supply 1, DC 6.5-25V; power supply 2, DC 5V

Operating Current: Standby current (all relays closed) 13MA, 1 relay open 44MA, 2 relays open 76MA, 3 relays open 109MA, 4 relays open 140MA

Send commands via Android Bluetooth APP control relay turned on and off (we provide Bluetooth APP, you can also use your own APP to control relays, sending commands to control)

【Quick Response】High-power MOS tube non-contact electronic switch, the current sensing switch has no limit on the number of times of opening and closing, and the response speed reaches the millisecond level.

【Widely Applicable】The shell is made of self-extinguishing material ABS, IP30 waterproof level, suitable for AC current measurement and monitoring, AC motor overload protection, automatic control system electronic switch.

【Stable Performance】The current sensing relay adopts a straight-through structure design. The isolation withstand voltage is up to 2000V, the hysteresis is less than 1%, and it can be used under strong magnetic conditions.

22.5 mm wide

Can be digitally set and with LCD display

Fault memory that can be switched-in

Price For: Each

4 or 16 analog outputs

16-bit resolution

100 S/s update rate

Small Size: 2021 Improved Version, This 3-Phase Monitoring Relay has a smaller compact size for easier 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

Small size allows mounting in small enclosure

Solid-state switching contains no moving parts to fail

Low 0.5 ampere activation allows monitoring of most small equipment circuit loads

Anti Interference Performance--DPA51CM44 3-Phase monitoring relay features strong anti-interference performance

Monitoring Phase Sequence--3-phase monitoring relay for phase sequence and phase loss

Detects Correct Sequence--Detects when all phases are present and have the correct sequence