LR2K0310 TELEMECANIQUE, LR2K0310 Datasheet - Page 25
LR2K0310
Manufacturer Part Number
LR2K0310
Description
RELAY, OVERLOAD, MINIATURE, CLASS 10, 2.6 TO 3.7 AMPS
Manufacturer
TELEMECANIQUE
Type
Overloadr
Datasheet
1.LP1K0910BD.pdf
(28 pages)
Specifications of LR2K0310
Contact Rating
2.6 to 3.7 A
Current, Rating Max
3.7
Function
Overload
Number Of Circuits
1
Number Of Poles
3
Primary Type
Contactor
Relay Type
Electro Mechanical
Reset Type
Manual or Auto
Standard Tripping Time
Between 4 and 10 Sec. for 7.2 Times the Setting Current
Dimensions (l × W × H, Mm)
58 × 45 × 65
04/01
Voltage Drop Caused by the Inrush Current (continued)
What cable c.s.a. is required for the control circuit of an CAD50G7 relay, operated from a distance of 500 meters.
CAD50G7, voltage 120 V, 60 Hz: inrush power: 70 VA.
On the left-hand graph on page 24, point X is at the intersection of the vertical line corresponding to 70 VA and the a 120 V (estimated) voltage curve.
On the right-hand graph on page 24 point Y is at the intersection of the vertical line corresponding to 500 m and the horizontal line passing through point X.
Use the conductor c.s.a. indicated by the curve which passes through point Y, between # 14 and # 16 AWG.
If point Y lies between two c.s.a. curves, choose the larger of the c.s.a. values. In this case # 14 AWG.
Calculating the maximum cable length
The maximum permissible length for acceptable line voltage drop is calculated by the formula:
Where:
L: distance between the contactor and the control device in m, (length of the cable),
U: supply voltage in V,
SA: apparent inrush power drawn by the coil in VA, (Vac) or W (Vdc)
s: conductor c.s.a. in mm
K: factor given in the table below.
a.c. supply
d.c. supply
L
=
U
------ - s.K.
SA
2
2
,
SA in VA
K
Irrespective of the inrush power SA, expressed in W
K = 1.38
©
2001 Schneider Electric All Rights Reserved
20
1.38
40
1.5
100
1.8
Long Distance Control Data
150
2
200
2.15
25