RM4TG20 TELEMECANIQUE, RM4TG20 Datasheet - Page 6

• 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

References :
page 3/35
Dimensions, schemes :
page 3/36
Setting-up :
page 3/37
Zelio Control - measurement and control relays
Current measurement relays RM4-JA
Presentation
Operating principle
The supply voltage is connected to terminals A1-A2.
The current to be monitored is connected to terminals B1, B2, B3 and C. See diagram below.
Hysteresis is adjustable between 5 and 30 %: for overcurrent h = (IS1 - IS2) / IS1, for undercurrent h = (IS2 - IS1) / IS1.
A measuring cycle lasts only 80 ms, which allows rapid detection of changes in current.
Relay set for overcurrent detection (RM4-JA01 or selector on “>” for model RM4-JA3i).
If the current is greater than the setting threshold IS1, the output relay is energised with or without a time delay, depending
on the model. When the current returns to a value IS2 below the threshold, depending on the hysteresis setting, the relay
is instantaneously de-energised.
Relay set for undercurrent detection (selector on “<”, model RM4-JA3i only).
If the current is less than the threshold setting IS1, the output relay is energised with or without a time delay, depending
on the model. When the current returns to a value IS2 above the threshold, depending on the hysteresis setting, the relay
is instantaneously de-energised.
Function diagrams:
Overcurrent detection
U supply
Current
measured
t :
Undercurrent detection
U supply
Current
measured
Note: The measurement ranges can be extended by means of a current transformer, the secondary of which is connected
to the terminals of the corresponding RM4, or by means of a resistor connected in parallel with the measuring input (see
example page 3/37 “Setting-up”).
time delay
B1, B2, B3
Relay
Relay
A1-A2
A1-A2
15-18
15-16
25-28
25-26
15-18
15-16
25-28
25-26
IS1
IS2
IS2
IS1
U drop < 1 V
(continued)
RM4-JA
t
Function “>”
t
Function “<”
C
Load
< t
< t
Te
3/33
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