Increasingly higher demands are being placed on safety and system availability – across all sectors. Processes are becoming more and more complex, not only in mechanical engineering and the chemical industry, but also in plant and automation technology. Demands on power engineering are also increasing constantly.
Error-free and therefore cost-effective operation can only be achieved through continuous monitoring of important network and system parameters. Electronic monitoring relays in the EMD series are available for a wide range of monitoring tasks to avoid the consequences of errors or to keep them within limits.
The operating states are indicated using colored LEDs, errors that may occur can be sent to a control system via a floating contact or can shut down a part of the system. Some device versions are equipped with startup and response delays in order to briefly tolerate measured values outside the set monitoring range.
Ambient temperature (operation)
-25 °C ... 55 °C
-25 °C ... 40 °C (corresponds to UL 508)
Ambient temperature (storage/transport)
-25 °C ... 70 °C
Nominal input voltage UN
3 N ~ 400/230 V
Maximum temperature coefficient
< 0.1 %/K
Window, with neutral conductor connection
Min. setting range
-30 % ... 20 % (From UN)
Max. setting range
-20 % ... 30 % (From UN)
Min setting range of the voltage threshold value
280 V AC ... 480 V AC
Max. setting range of the voltage threshold value
320 V AC ... 520 V AC
Setting range for response delay
0.2 s ... 10 s
± 5 % (of scale end value)
≤ 5 % (of scale end value)
≤ 2 %
≤ 0.5 %
1 floating PDT
Maximum switching voltage
250 V AC (in acc. with IEC 60664-1)
Interrupting rating (ohmic load) max.
750 VA (3 A/250 V AC, module aligned, ≤ 5 mm spacing)
1250 VA (5 A/250 V AC, module not aligned, ≥ 5 mm spacing)
5 A (fast-blow)
Supply voltage range
24 V AC ... 230 V AC (see Power modules)
24 V DC (see Power modules)
Mechanical service life
Approx. 2 x 107 cycles
100% operating factor
on standard DIN rail NS 35 in accordance with EN 60715
Conformance with EMC Directive 2004/108/EC
III, basic insulation (as per EN 50178)
Housing insulation material
Polyamide PA, self-extinguishing
Rated insulation voltage
300 V (According to EN 50178)
UL, USA / Canada
UL/C-UL listed UL 508
Conductor cross section flexible min.
Conductor cross section flexible max.
Conductor cross section solid min.
Conductor cross section solid max.
Conductor cross section AWG min.
Conductor cross section AWG max.
PDF of Monitoring relay for monitoring 3-phase voltages of 280...520 V AC, - PHOENIX CONTACT - EMD-SL-3V-400-N - 2885278