Datasheet

ManualsBrandsSelectron ManualsMonitoring RelaysVoltage Monitoring Relay

ESG 6.10

3-phase voltage monitoring relay

EMR DU21D

Functions

Monitoring of phase sequence, phase failure and detection of return

voltage (by means of evaluating the asymmetry).

• Voltage monitoring in 3-phase mains

• Measuring range 230 ... 400 Vac 3Ph

• Monitoring of phase sequence and phase failure

• Detection of reverse voltage

• Connection of neutral wire optional

• 2 changers

Reference data

Selectron

EMR Article no.

DU21D 230 ... 400 Vac 3Ph 41230001

(Order data see chapter 1)

Connecting voltages

3(N) ~230/400 V, Terminals (N)-L1-L2-L3 (= supply voltage)

Tolerance: 3(N) ~230/400 V, 3(N) ~342 ... 457 V

Indicators

Green LED ON: indication of supply voltage

Yellow LED ON/OFF: indication of relay output

Output relay

2 potential free change-over contacts

Rated voltage: 250 Vac

Switching capacity (distance <5 mm): 750 VA (3 A / 250 Vac)

Switching capacity (distance >5 mm): 1250 VA (5 A / 250 Vac)

Fusing: 5A fast acting

Time ranges

Start-up suppression time: max. 500 ms

Tripping delay: max. 350 ms

EMR DU21D

Summary of content (5 pages)

PAGE 1
3-phase voltage monitoring relay EMR DU21D • Voltage monitoring in 3-phase mains • Measuring range 230 ... 400 Vac 3Ph • Monitoring of phase sequence and phase failure • Detection of reverse voltage • Connection of neutral wire optional • 2 changers Functions Monitoring of phase sequence, phase failure and detection of return voltage (by means of evaluating the asymmetry). EMR DU21D Time ranges Start-up suppression time: Tripping delay: max. 500 ms max.
PAGE 2
3-phase voltage monitoring relay EMR DU21D Technical data Nominal consumption Nominal frequency Drop-out voltage Recovery time Measuring circuit: Input: 3(N) ~230/400 V Overload capacity: 3(N) ~230/400 V Input resistance: 3(N) ~230/400 V Asymmetry: 3(N) ~230/400 V, 9 VA 48 ... 63 Hz >20% of the supply voltage 500 ms Terminals (N)-L1-L2-L3 (= supply voltage) 3(N) ~264/457 V 15 kΩ typ. 30% Type key EMR D U 2 1 D ...
PAGE 3
-phase voltage monitoring relay EMR DU21D Function description LED SEQ L1 L2 L3 L1 L2 L3 Phase sequence monitoring When all the phases are connected in the correct sequence and the measured asymmetry is less than the fixed value, the output relays switch into on-position (yellow LED illuminated). When the phase sequence changes, the output relays switch into off-position (yellow LED not illuminated).
PAGE 4
Technical safety advice This manual contains the information necessary for the correct utilisation of the products described therein.
PAGE 5
Prescriptions and standards Mechanical data Housings in self-extinguishing plastic material. Protection mode IP 40 Mounting: snapping mode: Fixing on profile rail according DIN 46277/3 (EN 50 022) Connection via contact protected terminals up to 4 mm2, protecting mode IP 20 Environmental conditions Admissible environmental temperatures from -25 ºC ... +55 ºC (corresponds IEC 68-1) Storage and transport temperature from -25 ºC ...