RM4TG20 TELEMECANIQUE, RM4TG20 Datasheet - Page 12

• Manufacturer Part Number: RM4TG20
• Description: PHASE MONITORING RELAY, DPDT-2CO, 484VAC
• Manufacturer: TELEMECANIQUE
• Series: RM4r

Specifications of RM4TG20

• Contact Configuration: DPCO
• Phase Type: 3 Phase
• Supply Voltage Max: 484VAC
• Switching Voltage Max: 440VAC
• Relay Mounting: DIN Rail
• Length/height, External: 78mm
• External Width: 22.5mm
• External Depth: 80mm
• Carry Current: 8A

Characteristics:
page 3/40
References:
page 3/41
Dimensions, schemes:
page 3/42
Setting-up:
page 3/43
Zelio Control - measurement and control relays
Voltage measurement relays RM4-UA
Presentation
Operating principle
The supply voltage is connected to terminals A1-A2.
The voltage to be monitored is connected to terminals B1, B2 or B3 and C.
Hysteresis is adjustable between 5 and 30 %:
for overvoltage h = (US1 - US2) / US1, for undervoltage h = (US2 - US1) / US1.
A measurement cycle lasts only 80 ms, which allows rapid detection of changes in voltage.
Relays set for overvoltage detection (RM4-UA0i or selector on “>” for model RM4-UA3i):
If the voltage is greater than the threshold setting US1, the output relay is energised, with or without a time delay. When
the voltage returns to a value US2 below the threshold, depending on the hysteresis setting, the relay is instantaneously
de-energised.
Relays set for undervoltage detection (selector on “<”, model RM4-UA3i only):
If the voltage is less than the threshold setting US1, the output relay is energised, with or without a time delay. When the
voltage returns to a value US2 above the threshold, depending on the hysteresis setting, the relay is de-energised.
Function diagrams
Overvoltage control
U supply A1-A2
Voltage
measured
t:
Undervoltage control
U supply A1-A2
Note: the measurement ranges can be extended above 500 V by adding a resistor, see page 3/43.
The measurement range on c supply can be extended by means of a voltage transformer, the secondary of which is
connected to the measuring terminals of the corresponding RM4 .
Voltage
measured
time delay
Relay
Relay
US2
US1
US1
US2
15-18
15-16
25-28
25-26
15-18
15-16
25-28
25-26
(continued)
t
t
Function “<”
Function “>”
< t
< t
Te
3/39
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