Solid State Relays
Industrial, 1-Phase ZS, Standard Range
Types RA 24.. .. 06/RA 44.. .. 08/RA 48.. .. 12
• AC Solid State Relay
• Zero switching
• Direct copper bonding technology
• Rated operational current: 25, 50 and 90 AACrms
• Blocking voltage: Up to 1200 V
p
• Rated operational voltage: Up to 480 VACrms
• 3 input ranges: 3 to 32 VDC, 10 to 90 VAC/DC and
90 to 280 VAC/DC
• Isolation: OPTO (input-output) 4000 VACrms
Product Description
The zero switching relay with
antiparallel thyristor output is
the most widely used indus-
trial SSR due to its multiple
application possibilities. The
relay can be used for resis-
tive, inductive and capacitive
loads. The zero switching re-
lay switches ON when the
sine curve just crosses zero
and switches OFF when the
current crosses zero.
Ordering Key
Solid State Relay
Switching mode
Rated operational voltage
Rated operational current
Control voltage
Blocking voltage
RA 24 25 LA 06
Type Selection
Switching mode
A: Zero switching
Rated operational
voltage
24: 230 VACrms
44: 400 VACrms
48: 480 VACrms
Rated operational
current
25: 25 AACrms
50: 50 AACrms
90: 90 AACrms
Control voltage
-D: 3 to 32 VDC
LA: 10 to 90 VAC/DC
HA: 90 to 280 VAC/DC
Blocking voltage
06: 650 V
p
08: 850 V
p
12: 1200 V
p
Selection Guide
Rated opera- Blocking
tional voltage voltage
Control voltage
Rated operational current
25 AACrms
50 AACrms
RA 2425 -D 06
RA 2425 LA 06
RA 2425 HA 06
RA 4425 -D 08
RA 4425 LA 08
RA 4425 HA 08
RA 4825 -D 12
RA 4825 LA 12
RA 4825 HA 12
RA 2450 -D 06
RA 2450 LA 06
RA 2450 HA 06
RA 4450 -D 08
RA 4450 LA 08
RA 4450 HA 08
RA 4850 -D 12
RA 4850 LA 12
RA 4850 HA 12
90 AACrms
RA 2490 -D 06
RA 2490 LA 06
RA 2490 HA 06
RA 4490 -D 08
RA 4490 LA 08
RA 4490 HA 08
RA 4890 -D 12
RA 4890 LA 12
RA 4890 HA 12
3 to 32 VDC
230 VACrms
650 V
p
10 to 90 VAC/DC
90 to 280 VAC/DC
3 to 32 VDC
400 VACrms
850 V
p
10 to 90 VAC/DC
90 to 280 VAC/DC
3 to 32 VDC
480 VACrms
1200 V
p
10 to 90 VAC/DC
90 to 280 VAC/DC
Specifications are subject to change without notice (28.04.2015)
1
RA 24.. .. 06, RA 44.. .. 08, RA 48.. .. 12
General Specifications
RA 24.. .. 06
Operational voltage range
Blocking voltage
Zero voltage turn-on
Operational frequency range
Power factor
Approvals
24 to 280 VACrms
≥
650 V
p
≤
20 V
45 to 65 Hz
≥
0.5 @ 230 VACrms
UL, CSA
RA 44.. .. 08
42 to 480 VACrms
≥
850 V
p
≤
40 V
45 to 65 Hz
≥
0.5 @ 400 VACrms
UL, CSA
RA 48.. .. 12
42 to 530 VACrms
≥
1200 V
p
≤
40 V
45 to 65 Hz
≥
0.5 @ 480 VACrms
UL, CSA
Input Specifications
RA .... -D ..
Control voltage range
Pick-up voltage
Drop-out voltage
Reverse voltage
Input impedance
Response time pick-up
Control pulse width
Response time drop-out
3 to 32 VDC
≤
3 VDC
≥
1 VDC
≤
32 VDC
1.5 kΩ
≤
1/2 cycle
≥ 0.5
ms
≤
1/2 cycle
RA .... LA ..
10 to 90 VAC/DC
≤
10 VAC/DC
≥
1 VAC/DC
5.4 kΩ
≤
1 cycle
≥ 0.5 ms
≤
1/2 cycle
RA .... HA ..
90 to 280 VAC/DC
≤
90 VAC/DC
≥
10 VAC/DC
44 kΩ
≤
1 cycle
≥ 0.5 ms
≤
1/2 cycle
Output Specifications
RA..25 .. ..
Rated operational current AC 51
AC 53a
Minimum operational current
Rep. overload current t=1 s
Non-rep. surge current t=10 ms
Off-state leakage current
@ rated voltage and frequency
I
2
t for fusing t=10 ms
On-state voltage drop
@ rated current
Critical dV/dt commutating
Critical dV/dt off-state
25 Arms
5 Arms
150 mArms
≤
55 Arms
325 A
p
≤
3 mArms
≤
525 A
2
s
RA ..50 .. ..
50 Arms
15 Arms
250 mArms
≤
125 Arms
600 A
p
≤
3 mArms
≤
1800 A
2
s
RA ..90 .. ..
90 Arms
20 Arms
400 mArms
≤
150 Arms
1150 A
p
≤
3 mArms
≤
6600 A
2
s
≤
1.6 Vrms
≥ 500 V/µs
≥ 500 V/µs
≤
1.6 Vrms
≥ 500 V/µs
≥ 500 V/µs
≤
1.6 Vrms
≥ 500 V/µs
≥ 500 V/µs
Thermal Specifications
RA ..10 .. ..
Operating temperature
Storage temperature
Junction temperature
R
th
junction to case
R
th
junction to ambient
-20 to +70 °C
(-4° to +158°F)
-40 to +100 °C
(-40° to +212°F)
≤125
C (
≤
257°F)
≤
2.0 K/W
≤
12.5 K/W
RA ..25 .. ..
-20 to +70 °C
(-4° to +158°F)
-40 to +100 °C
(-40° to +212°F)
≤125
C (
≤257°F)
≤
1.25 K/W
≤
12 K/W
RA ..50 .. ..
-20 to +70 °C
(-4° to +158°F)
-40 to +100 °C
(-40° to +212°F)
≤125
C (
≤257°F)
≤
0.65 K/W
≤
12 K/W
RA ..90 .. ..
-20 to +70 °C
(-4° to +158°F)
-40 to +100 °C
(-40° to +212°F)
≤125
C (
≤
257°F)
≤
0.3 K/W
≤
12 K/W
2
Specifications are subject to change without notice (28.04.2015)
RA 24.. .. 06, RA 44.. .. 08, RA 48.. .. 12
Isolation
Rated isolation voltage
Input to output
Rated isolation voltage
Output to case
Insulation resistance
Input to output
Insulation resistance
Ouput to case
Insulation capacitance
Input to output
Insulation capacitance
Output to case
≥
4000 VACrms
≥
10
10
W
≥
10
10
W
≤
8 pF
≤
100 pF
≥
4000 VACrms
Accessories
Protection cover
Heatsinks
DIN rail adapter
Varistors
Fuses
For further information refer
to "General Accessories".
Wiring Diagram
Functional Diagram
Mains input/load output
Control
input
Line/load
Control
input
Load output/mains input
Dimensions
**
***
***
Housing Specifications
Weight
Housing material
Base plate
Potting compound
Relay
Mounting screws
Mounting torque
Control terminal
Mounting screws
Mounting torque
Power terminal
Mounting screws
Mounting torque
25, 50 A
90 A
Approx. 110 g
Noryl GFN 1, black
Aluminium, nickel-plated
Copper, nickel-plated
Polyurethane
M5
≤
1.5 Nm
M3 x 6
≤
0.5 Nm
M5 x 6
≤
2.4 Nm
** =
±
0.4 mm
*** =
±
0.5 mm
All dimensions in mm
***
***
**
Specifications are subject to change without notice (28.04.2015)
3
RA 24.. .. 06, RA 44.. .. 08, RA 48.. .. 12
Heatsink Dimensions
RA ..25 .. ..
Load
current [A]
Thermal resistance
[K/W]
(load current versus ambient temperature)
RA ..50 .. ..
Power
dissipation [W]
Load
current [A]
Thermal resistance
[K/W]
Power
dissipation [W]
25
22.5
20
17.5
15
12.5
10
7.5
5
2.5
2
2.5
3.1
4.
4.9
6.2
8.1
11.3
-
-
20
1.7
2.1
2.7
3.5
4.3
5.4
7.1
9.9
15.6
-
30
1.4
1.8
2.3
3
3.7
4.6
6.1
8.5
13.3
-
40
1
1.4
1.9
2.5
3.1
3.9
5.1
7.1
11.1
-
50
0.71
1
1.4
2
2.5
3.1
4
5.6
8.9
18.7
60
0.40
0.66
1
1.4
1.9
2.3
3
4.2
6.7
14
70
32
27
23
20
16
13
10
7
5
2
T
A
50
45
40
35
30
25
20
15
10
5
0.92
1.2
1.5
1.9
2.4
3
3.9
5.5
8.6
17.9
20
0.76
0.99
1.3
1.6
2.1
2.7
3.5
4.8
7.5
15.6
30
0.60
0.80
1.1
1.4
1.8
2.3
3
4.1
6.4
13.4
40
0.45
0.62
0.85
1.1
1.5
1.9
2.5
3.4
5.4
11.2
50
0.29
0.44
0.63
0.89
1.2
1.5
2
2.7
4.3
8,9
60
-
0.26
0.42
0.63
0.91
1.1
1.5
2.1
3.2
6.7
70
63
55
47
40
33
26
20
15
9
4
T
A
Ambient temp. [°C]
Ambient temp. [°C]
RA ..90 .. ..
Load
current [A]
Thermal resistance
[K/W]
Power
dissipation [W]
90
80
70
60
50
40
30
20
10
0.63
0.81
1
1.3
1.7
2.2
3.1
4.8
10
20
0.53
0.69
0.89
1.2
1.5
1.9
2.7
4.2
8.8
30
0.42
0.57
0.75
1
1.3
1.7
2.3
3.6
7.5
40
0.32
0.45
0.61
0.83
1.1
1.4
1.9
3
6.3
50
-
0.33
0.47
0.66
0.85
1.1
1.5
2.4
5
60
-
-
0.33
0.49
0.64
0.83
1.2
1.8
3.8
70
97
84
71
59
47
36
26
17
8
T
A
Ambient temp. [°C]
4
Specifications are subject to change without notice (28.04.2015)
RA 24.. .. 06, RA 44.. .. 08, RA 48.. .. 12
Heatsink Selection
Ordering Key
•
•
•
•
Heatsinks and fans
5.40
o
C/W to 0.12
o
C/W thermal resistance
DIN, panel or thru wall mounting
Single or multiple SSR mounting
RHS..
Heatsink Range Overview:
http://www.productselection.net/PDF/UK/ssr_accessories.pdf
Heatsink Selector Tool:
http://www.productselection.net/heatsink/heatsinkselector.php?LANG=UK
Applications
This relay is designed for use
in applications in which it is
exposed to high surge condi-
tions. Care must be taken to
ensure proper heatsinking
when the relay is to be used at
high sustained currents. Ade-
quate electrical connection
between relay terminals and
cable must be ensured.
Thermal characteristics
The thermal design of Solid
State Relays is very impor-
Heat flow
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.
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 high thermal fatigue
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:
I
rms
=
I
ON2
x t
ON
t
ON
+ t
OFF
Ex: RA 24 50 -D 06:
Load current = 45 A
t
ON
= 30 s
t
OFF
= 15 s
I
rms
=
45
2
x 30
30 + 15
The rms current will be
36.7 A.
R
th
j-c
Junction
temperature
R
th
c-s
Case
temperature
R
th
s-a
Heatsink
temperature
Ambient
temperature
ON
OFF
t
off
t
on
Thermal resistance:
R
th
j-c = junction to case
R
th
c-s = case to heatsink
R
th
s-a = heatsink to ambient
Specifications are subject to change without notice (28.04.2015)
5
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