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Current Monitoring Relays

Current monitoring relays prevent issues due to overcurrent or undercurrent. If an overcurrent or undercurrent occurs within an application, the current monitoring relay will activate, signaling an alarm or switch off the flow of energy through the circuit.

Schneider Electric Harmony Control Relays monitor and detect abnormal operating conditions concerning current, phase, voltage, frequency, liquid level, temperature, speed and pump control. This information allows users to initiate the necessary corrective actions before serious breakdowns occur. Settings can be configured digitally using the Zelio NFC App. Monitoring parameters can be set precisely to the desired value and time delay can be set to minutes, seconds or milliseconds.

Phoenix Contact EMD-BL compact monitoring relays are ideal for simple monitoring tasks and are particularly suited for use in the series production of machines and systems, as well as in building installation. They monitor currents, voltages, phase sequence and temperature. The EMD monitoring relays monitor electrical and physical system parameters. They monitor currents, voltages, phase sequences, real powers, loads and temperatures.

Products

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$175.57
Littelfuse TCSHAB is a current sensor with a steady state output load rating of 1 A and inrush rating of 10 A. It features 0.25 in. (6.3 mm) male quick connect terminals for easy termination. With a sensor hole size of 0.36 in. (9.14 mm), it can accommodate up to #4 AWG THHN wire. The sensor has a response time of ≤200 ms for overcurrent and ≤1 s for undercurrent. It has a sensor range of 2-20 A, adjustable with a guaranteed range, and a maximum steady state rating of 50 A. The sensor is toroid type and requires properly insulated wiring. The output voltage ranges from 24-240 volts with a voltage drop of approximately 2.5 V. Humidity up to 95% non-condensing is tolerated. The insulation resistance is ≥100 ohms, and the dielectric breakdown is ≥2000 terminals to the mounting surface. The burden is ≤0.5 VA.
$175.57
Littelfuse TCSHAA is a current sensor with a range of 2-20 A, adjustable within the guaranteed range. It has a response time of ≤200 ms for overcurrent and ≤1 s for undercurrent. The sensor has a 0.36 in. (9.14 mm) sensor hole and 0.25 in. (6.3 mm) male quick connect terminals for easy installation. It operates between 24-240 Volts with a voltage drop of ≅2.5 V and a burden of ≤0.5 VA. The sensor is designed for use with #4 AWG (21.1 mm²) THHN wire and has a dielectric breakdown of ≥2000 terminals to mounting surface.
$175.57
Littelfuse TCSH2B is a current sensor with a 2A fixed range and 50A maximum rating. It has quick connect terminals for easy installation and a sensor hole size of 0.36 inches. The sensor operates with a response time of ≤200ms for overcurrent and ≤1s for undercurrent. It has an output voltage range of 24-240 Volts and a voltage drop of approximately 2.5V. With a compact design and high insulation resistance, it is reliable and suitable for various applications.
$175.57
Littelfuse TCSH2A is a current sensor with a fixed range of 2 A, a maximum range of 50 A turns, and a reset at approximately 95% of the actuate current. It has a response time of ≤200 ms for overcurrent and ≤1 s for undercurrent. The sensor uses a toroid, through-hole wiring system and requires properly insulated wires. It has a termination type of 0.25 in. (6.3 mm) male quick connect terminals, and a sensor hole size of 0.36 in. (9.14 mm) for up to #4 AWG (21.1 mm²) THHN wire. The output load rating is 1 A steady state and 10 A for inrush. The output voltage range is 24 - 240 Volts, with a voltage drop of approximately 2.5 V. The product is humidity resistant up to 95% non-condensing. It has an insulation resistance of ≥100 and a dielectric breakdown of ≥2000 terminals to mounting surface. The product has a burden of ≤0.5 VA.
$175.57
Littelfuse TCSGAB is a current sensor with a 2-20 A adjustable range and a response time of ≤200 ms for overcurrent and ≤1 s for undercurrent. It has a sensor hole size of 0.36 in. and a termination type of 0.25 in. male quick connect terminals. The sensor operates at an output voltage of 3-50V DC and has a low burden of ≤0.5 VA.
$175.57
Littelfuse TCSGAA is a compact current sensor with a male quick connect termination for easy installation. It has a wide current sensor range of 2-20 A and a maximum output voltage of 50 Volts (DC). With a response time of ≤200 ms for overcurrent and ≤1 s for undercurrent, it guarantees reliable and quick protection. The sensor is suitable for up to #4 AWG wire and has a low burden of ≤0.5 VA. With its toroid sensor type and 95% non-condensing humidity resistance, it ensures accurate and durable performance.
$175.57
Littelfuse TCSG2A is a current sensor with a 2 A fixed range and a maximum of 50 A. It features quick connect terminals and a sensor hole size of 0.36 in. The sensor operates on a voltage range of 3-50 Volts DC with an output voltage drop of approximately 1.2 V. With a response time of ≤200 ms for overcurrent and ≤1 s for undercurrent, it offers reliable performance.
$262.70
Littelfuse TCSA50 is a current sensor with a 0-50A range and ±2% full scale accuracy. It features 0.25" male quick connect terminals and a 0.36" sensor hole size. With a response time of approximately 300ms and a sensor frequency range of 30-100Hz, this sensor provides reliable and precise current monitoring. It has a 4-20mA output range, with a zero adjust of 3.75-4.25mA. The sensor is reverse polarity protected and has a dielectric breakdown of ≥2000 terminals. It operates within a temperature range of -40 to 85°C, making it suitable for harsh environments.
$262.70
Littelfuse TCSA5 is a current sensor with a 0-5A range and a ±2% full-scale accuracy. It features a response time of approximately 300ms and a sensor hole size of 0.36 inches, accommodating up to #4 AWG THHN wire. The sensor is toroid type, with a frequency range of 30-100Hz. It has a 4-20mA output range and a zero adjust of approximately 3.75-4.25mA. The product is reverse polarity protected and has a momentary output voltage of 40V for 1m.
$262.70
Littelfuse TCSA20 is a current sensor with 0-20 A range and ±2% full-scale accuracy. It features a quick connect termination and reverse polarity protection. With a response time of approximately 300 ms and a sensor frequency of 20-100 Hz, it ensures precise monitoring. The sensor is compatible with #4 AWG THHN wire and has an output range of 4-20 mA. Its dimensions fit a 0.36 in. sensor hole and it operates at 10-30 VDC. The sensor has a momentary output voltage of 40 V for 1 m.
$262.70
Littelfuse TCSA10 current sensor is equipped with 0.25 in. male quick connect terminals for easy installation. With a humidity tolerance of 95% and repeat accuracy of ≤0.25%, it ensures reliable performance. The sensor can handle a current range of 0-10A and has reverse polarity protection. Its response time is approximately 300ms, making it suitable for various applications. The sensor is compatible with up to #4 AWG THHN wire and operates at a frequency range of 20-100Hz. It has an output voltage of 10-30V (DC) and an output range of 4-20mA. The zero adjust range is approximately 3.75-4.25mA. The sensor's insulation resistance is ≥100 and its dielectric breakdown is ≥2000 terminals to the mounting surface. The temperature coefficient is ±0.05% and the burden is ≤0.5VA. It offers a momentary output voltage of 40V for 1ms.
$1336.18
Littelfuse LSRX-OEM is a compact and versatile relay with a pilot duty output load rating of 480 VA at 240 volts B300. It also functions as a general-purpose relay with a load rating of 5 A at 240 volts. The relay features torque and wire termination options, allowing for easy installation with 12-26 AWG wire and 0.25 in quick-connect fast-on terminals. Powered through the AC conductor, it has a sensor hole size of 0.725 in diameter. The input current range is 5-200 A continuous, with a pull-in current of 4.5 A (typical) and 7.0 A (max).