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Monitoring Relays – Reliable Protection & Control

  • Monitor voltage, current, phase, and frequency parameters.
  • Compact DIN rail design with status LEDs.
  • Adjustable threshold and delay settings.
  • Detects phase failure, asymmetry, over/under-voltage.
  • Available in 1-phase and 3-phase models.
  • Relay output for alarms or system shutdown.
  • Plug-in or screw terminal versions available.
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Product parameters Order Code Relevant information
Specification Description
Monitoring Type Voltage, current, phase sequence, frequency
Input Voltage Range 24 V AC/DC – 3 x 500 V AC (model dependent)
Output Contacts 1 or 2 changeover relays (SPDT)
Mounting DIN rail (EN 60715)
Width 22.5 mm
Indicators LEDs for operational and fault status
Settings Threshold, delay time, hysteresis via rotary switches
Article Number Product Name Description
2900990 EMD-SL-3V400 3-phase voltage monitoring relay, 3 x 400 V AC, monitors overvoltage, undervoltage, phase sequence, and failure.
2900991 EMD-BL-1V24 1-phase voltage monitoring relay, 24 V DC, compact design, SPDT relay output, adjustable threshold.
2900992 EMD-SL-3V400-2R 3-phase monitoring relay with 2 SPDT contacts, detects phase failure, asymmetry, and incorrect sequence.
2900993 EMD-SL-1I-10 Current monitoring relay for 1-phase, input range up to 10 A, adjustable response delay.
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