Monitoring relays and current monitors – The inexpensive solution for monitoring key system parameters

Monitoring relays and current relays

Monitoring relays are an inexpensive solution for monitoring important electrical and physical system parameters. EMD monitoring relays can be used to monitor overvoltage, undervoltage, overcurrent, undercurrent, phase failure, phase sequence, phase asymmetry, power factor, active power, motor winding temperature, and fill levels. The current relay detects and monitors sinusoidal alternating currents in the frequency range from 45 to 65 Hz.

More information

Your advantages

  • Increase system availability and reduce downtime
  • Easy configuration with user-friendly user interface
  • Targeted control or shutdown when a limit value is exceeded or not met

New products

New MACX-MR smart monitoring relay on a DIN rail

Smart monitoring relays

Intelligent, small, precise, and user-friendly

The new MACX-MR monitoring relay offers two intuitive methods of operation. Either with OLED and keys or with a smartphone app via NFC. This allows you to make precise settings as well as read detailed module information and error logs about measured values.

These are the advantages

  • 24 V AC/DC ... 240 V AC/DC integrated power supply, isolated from the measuring input
  • Setting accuracy: 1% of the set value
  • Operating temperature: -25°C … +70°C
  • CE, CCC, UL
  • Compliance with railway standard EN 50155, GB/T 25119

These are the main features

  • Intuitive operation thanks to high-contrast OLED display with keys as well as an app for NFC communication for making settings directly without having to check and calculate
  • Comprehensive error logging and error retrieval as well as configurable output contacts to distinguish between different errors
  • Single-channel extended measuring range to avoid wiring errors for the customer
  • Electrical isolation ensures a high degree of safety and accuracy

Monitoring relay with display and buttons

Versatile monitoring functions with intuitive operation

Smart monitoring relays

The smart MACX-MR monitoring relay provides you with many monitoring functions with extended setting options, large measuring ranges, and a broad supply voltage range.

Your advantages with our smart monitoring relay:

  • High-contrast OLED display for on-site configuration and measured value display
  • Smart configuration and easy transfer of configurations with the MACX-MR app via NFC communication
  • Wide supply voltage range with galvanic isolation from the measuring circuit
  • Extended measuring ranges and high measuring accuracy with true RMS measurement
  • PIN protection against unauthorized changes
  • Precise limit value setting without checking or calculating potentiometer settings

MACX-MR monitoring relay in detail

Smart monitoring relays, configuration via display and button
MACX-TR monitoring relay, error evaluation via smartphone app
Smart monitoring relays, portfolio overview
Smartphone with configuration app for monitoring relays
Smart monitoring relays, configuration via display and button

Start a precise device configuration with the intuitive menu navigation, without long tests and calculations. Use either the easy-to-read OLED display and the pushbuttons on the device or the smartphone app with extended functions.

MACX-TR monitoring relay, error evaluation via smartphone app

Have an overview of even small deviations from normal operation. The recording of the error code, error value, value deviation, and error time help to quickly analyze and fix the cause of the error. You can configure the error output contacts to distinguish between different errors.

Smart monitoring relays, portfolio overview

Experience the versatility of the MACX-MR monitoring relay with its extended setting options, wide measuring range and wide supply voltage range. The electrical isolation of the measuring and supply circuit guarantees you high safety and accuracy.

Smartphone with configuration app for monitoring relays

Use the many options of the smartphone app to intuitively configure your monitoring relay. The extended functions include the readout and transfer of stored settings to additional monitoring relays as well as the availability of device information. A function diagram, a description, and a reminder function in the event of setting errors have been integrated into the app to ensure that making the settings is even more intuitive. The MACX-MR app is used to perform an accurate parameter configuration, which is downloaded to the device in batches. Protect the configurations of the monitoring relay against unauthorized access using a PIN code.

Four compact monitoring relays on a DIN rail

Compact monitoring relays – quick and tool-free wiring

Compact monitoring relays

The compact EMD-BL monitoring relays are ideal for simple monitoring tasks, especially in building installation and series production.

Your advantages with our compact monitoring relays:

  • Space saving with the compact installation housing
  • Easy handling with rotary switches on the housing front for parameter setting
  • Clear diagnostics with status LED
  • Ideal for series production thanks to a price-optimized solution for numerous monitoring functions

EMD-BL monitoring relays in detail

Four monitoring relays side by side with hand for size comparison
Two monitoring relays with one line wired via push-in direct-connection technology
Monitoring relay with screwdriver for setting parameters via rotary switch
Conveyor drive with motor, connector, and connection to the monitoring relay
Four monitoring relays side by side with hand for size comparison

The devices of the EMD-BL series stand out in particular due to their slim design and belong to the compact monitoring relays of our product family. With the increasing amounts of electronics in the control cabinet, lack of space is a constant challenge. With the space-saving design, our monitoring relay is ideally suited for building installation and series production.

Two monitoring relays with one line wired via push-in direct-connection technology

Reduce wiring time many times over with the proven push-in direct-connection technology. Without tools and up to 50% lower insertion forces, you reduce not only the time required but also process costs. Both voltage and phase monitoring relays are quickly installed because they are supplied from the measuring circuit.

Monitoring relay with screwdriver for setting parameters via rotary switch

Desired parameters, such as monitoring ranges and tripping delay, are set conveniently via rotary switches on the front of the housing. Easy-to-read LEDs also allow rapid on-site analysis.

Conveyor drive with motor, connector, and connection to the monitoring relay

Current monitoring: Check electrical loads for functionality or wire breaks with undercurrent monitoring and avoid overload situations or blockages with overcurrent monitoring.

Phase monitoring: Monitor all phase parameters (phase failure, phase sequence, and asymmetry) in a 3-phase network

Temperature monitoring: Detect motor heating with temperature-dependent resistors that activate the relay to signal.

Voltage monitoring: Protect machinery and equipment from the damaging effects of overvoltages and undervoltages.

Current relays

Current relays: current values at a glance

Current relays

The current relay converts sinusoidal 50 Hz/60 Hz alternating currents into binary switching signals. Current detection takes place inductively via the conductor led through the module. The switching thresholds are set roughly via internal DIP switches, with fine adjustment performed using a potentiometer on the front. A high-quality changeover contact relay with a gold layer is located on the output side. It can be operated in both open and closed circuit current behavior.

Your advantages with the current relay

  • Adjustable switching hysteresis
  • Relay changeover contact output
  • 3-way isolation
  • Adjustable open and closed circuit current behavior
  • Switching point can be freely selected in the measuring range from 0 to 16 A AC
E-paper
The entire portfolio at a glance
You will find our expertise in switching, isolating, and amplifying here. Select the ideal relay for your application from the range stretching from solid-state relays, electromechanical relays, coupling relays, optocouplers, monitoring relays, timer relays, right through to logic modules.
Open the e-paper
Product family relays, optocouplers, monitoring relays, and current monitors