KCA-E4E Leach International, KCA-E4E Datasheet - Page 8
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KCA-E4E
Manufacturer Part Number
KCA-E4E
Description
Electromechanical Relay 3PDT 25A 28VAC Flange Mount
Manufacturer
Leach International
Type
Non Latching Relayr
Datasheet
1.KCA-E4E.pdf
(12 pages)
Specifications of KCA-E4E
Contact Arrangement
3PDT
Coil Current
225 mA
Mounting
Flange Mount
Types of suppressors:
Passive devices.
The resistor capacitor circuit
It eliminates the power dissipation problem, as well as fast voltage rises. With a proper match between coil and resistor,
approximate capacitance value can be calculated from:
C = 0.02xT/R, where
T = operating time in milliseconds
R = coil resistance in kiloOhms
C = capacitance in microFarads
The series resistor must be between 0.5 and 1 times the coil resistance. Special consideration must be taken for the
capacitor inrush current in the case of a low resistance coil.
The record shown opposite is performed on the same relay as above. The operation time becomes:
- time to start the movement 2.3ms
- transfer time 1.2ms
The major difficulty comes from the capacitor volume. In our example of a relay with a 290
coil and time delay of 8 ms, a
capacitance value of C=0.5 uF is found. This non polarized capacitor, with a voltage of 63V minimum, has a volume of about
3
3
1cm
. For 150V, this volume becomes 1.5 cm
.
Date of issue: 6/00
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