RM4TA02 SQUARE D, RM4TA02 Datasheet - Page 6

• Manufacturer Part Number: RM4TA02
• Description: PHASE FAILURE RELAY 300V 5A RM4
• Manufacturer: SQUARE D

Product data sheet
Performance Curves
Electrical Durability and Load Limit Curves
AC Load
Curve 1: Electrical durability of contacts on resistive load in millions of operating cycles
X
Y
Curve 2: Reduction factor k for inductive loads (applies to values taken from durability Curve 1)
X
Y
Example: An LC1-F185 contactor supplied with 115 V/50 Hz for a consumption of 55 VA or a current consumption equal to 0.5 A and cos φ =
0.3.
For 0.5 A, curve 1 indicates a durability of approximately 1.5 million operating cycles.
As the load is inductive, it is necessary to apply a reduction coefficient k to this number of cycles as indicated by curve 2.
For cos φ = 0.3: k = 0.6
The electrical durability therefore becomes:
1.5 x 10
DC Load
Load limit curve
X
Y
1
2
3
6
Current broken in A
Millions of operating cycles
Power factor on breaking (cos φ)
Reduction factor K
Current in A
Voltage in V
L/R = 20 ms
L/R with load protection diode
Resistive load
6
operating cycles x 0.6 = 900 000 operating cycles
RM4TA02