RA4825-D12 CARLO GAVAZZI, RA4825-D12 Datasheet - Page 5

• Manufacturer Part Number: RA4825-D12
• Description: SSR, PANEL MOUNT, 530VAC, 32VDC, 25A
• Manufacturer: CARLO GAVAZZI

Specifications of RA4825-D12

• Control Voltage Range: 3VDC To 32VDC
• Operating Voltage Range: 42VAC To 530VAC
• Load Current: 25A
• Isolation Voltage: 4000Vrms
• Control Voltage Type: DC
• Relay Terminals: Screw
• Output Device: Thyristor
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

This relay is designed for use
in applications in which it is
exposed to high surge condi-
tions. Care must be taken to
ensure
when the relay is to be used at
high sustained currents. Ade-
quate electrical connection
between relay terminals and
cable must be ensured.
RA 24.. .. 06, RA 44.. .. 08, RA 48.. .. 12
Applications
Thermal characteristics
The thermal design of Solid
State Relays is very impor-
Thermal resistance:
R
2-64
th
Junction
temperature
j-c = junction to case
proper
R
th
j-c
Heat flow
heatsinking
Case
temperature
R
th
c-s
R
R
tant. It is essential that the user
makes sure that cooling is ad-
equate and that the maximum
junction temperature of the re-
lay is not exceeded.
If the heatsink is placed in a
small closed room, control
panel or the like, the power
dissipation can cause the
ambient temperature to rise.
The heatsink is to be cal-
culated on the basis of the
ambient temperature and the
increase in temperature.
th
th
Heatsink
temperature
c-s = case to heatsink
s-a = heatsink to ambient
R
th
s-a
Ambient
temperature
Direct bonding
In the design of the output
power semiconductor direct
bonding of the copper layer
and the ceramic substrate has
been applied. This is to en-
sure uninhibited heat transfer
and
strength.
The relay has been designed
for applications requiring lar-
ge numbers of load cycles.
Power dissipation
The power dissipation for in-
termittent use is calculated ac-
cording to the following for-
mula:
Specifications are subject to change without notice (28.02.2007)
OFF
ON
high
t
on
thermal
t
off
fatigue
The rms current will be
36.7 A.
I
Ex: RA 24 50 -D 06:
Load current = 45 A
t
t
I
rms
rms
ON
OFF
= 30 s
= 15 s
=
=
I
t
45
30 + 15
ON
ON
2
2
+ t
x t
x 30
OFF
ON