Carlo Gavazzi RA 24.. .. 06, RA 44.. .. 08, RA 48.. .. 12 Catalog Page

Specifications are subject to change without notice 1

• AC Solid State Relay

• Zero switching or instant-on switching

• Direct copper bonding technology

• Rated operational current: 10, 25, 50 and 90 AACrms

• Non-repetitive voltage: Up to 1200 Vp

• 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

• Insulation: OPTO (input-output) 4000 VACrms

Product Description

The zero switching relay with
antiparallel thyristor output is
the most widely used indus­trial SSR due to its multiple
application possibilities. The
relay can be used for resis-

Solid State Relay
Switching mode
Rated operational voltage
Rated operational current
Control voltage
Non-rep. peak voltage

Ordering Key

Solid State Relays

tive, inductive and capacitive
loads. The zero switching re­lay switches ON when the
sine curve just crosses zero
and switches OFF when the
current crosses zero.

Type Selection

Switching mode Rated operational Rated operational Control voltage Non-rep. voltage

voltage current

A: Zero switching 24: 230 VACrms 10: 10 AACrms -D: 3 to 32 VDC 06: 650 Vp
Optional: 44: 400 VACrms 25: 25 AACrms LA: 10 to 90 VAC/DC 08: 850 Vp
B: Instant-on switching 48: 480 VACrms 50: 50 AACrms HA: 90 to 280 VAC/DC 12: 1200 Vp

90: 90 AACrms

Selection Guide

Rated opera- Non-rep. Control voltage Rated operational current
tional voltage voltage 10 AACrms 25 AACrms 50 AACrms 90 AACrms

3 to 32 VDC RA 2410 -D 06 RA 2425 -D 06 RA 2450 -D 06 RA 2490 -D 06

230 VACrms 650 Vp 10 to 90 VAC/DC RA 2410 LA 06 RA 2425 LA 06 RA 2450 LA 06 RA 2490 LA 06

90 to 280 VAC/DC RA 2410 HA 06 RA 2425 HA 06 RA 2450 HA 06 RA 2490 HA 06

3 to 32 VDC RA 4410 -D 08 RA 4425 -D 08 RA 4450 -D 08 RA 4490 -D 08

400 VACrms 850 Vp 10 to 90 VAC/DC RA 4410 LA 08 RA 4425 LA 08 RA 4450 LA 08 RA 4490 LA 08

90 to 280 VAC/DC RA 4410 HA 08 RA 4425 HA 08 RA 4450 HA 08 RA 4490 HA 08

3 to 32 VDC RA 4810 -D 12 RA 4825 -D 12 RA 4850 -D 12 RA 4890 -D 12

480 VACrms 1200 Vp 10 to 90 VAC/DC RA 4810 LA 12 RA 4825 LA 12 RA 4850 LA 12 RA 4890 LA 12

90 to 280 VAC/DC RA 4810 HA 12 RA 4825 HA 12 RA 4850 HA 12 RA 4890 HA 12

Industrial, 1-Phase ZS/(IO), Standard Range

Types RA 24.. .. 06/RA 44.. .. 08/RA 48.. .. 12

RA 24 10 LA 06

2 Specifications are subject to change without notice

RA 24.. .. 06, RA 44.. .. 08, RA 48.. .. 12

RA 24.. .. 06 RA 44.. .. 08 RA 48.. .. 12

Operational voltage range 24 to 280 VACrms 42 to 480 VACrms 42 to 530 VACrms

Non-rep. peak voltage ≥ 650 V

p

≥ 850 V

p

≥ 1200 V

p

Zero voltage turn-on ≤ 20 V ≤ 40 V ≤ 40 V

Operational frequency range 45 to 65 Hz 45 to 65 Hz 45 to 65 Hz

Power factor ≥ 0.5 @ 230 VACrms ≥ 0.5 @ 400 VACrms ≥ 0.5 @ 480 VACrms

Approvals UL, CSA (10, 25, 50 A) UL, CSA (10, 25, 50 A) UL, CSA (10, 25, 50 A)

CSA (90 A) CSA (90 A) CSA (90 A)

General Specifications

RA .... -D .. RA .... LA .. RA .... HA ..

Control voltage range 3 to 32 VDC 10 to 90 VAC/DC 90 to 280 VAC/DC

Pick-up voltage ≤ 3 VDC ≤ 10 VAC/DC ≤ 90 VAC/DC
Drop-out voltage ≥ 1 VDC ≥ 1 VAC/DC ≥ 10 VAC/DC
Reverse voltage ≤ 32 VDC
Input impedance 1.5 kΩ 5.4 kΩ 44 kΩ

Response time pick-up

RA ≤ 1/2 cycle ≤ 1 cycle ≤ 1 cycle

RB ≤ 1 ms ≤ 1 ms ≤ 1 ms
Control pulse width ≥ 0.5 ms ≥ 0.5 ms ≥ 0.5 ms
Response time drop-out ≤ 1/2 cycle ≤ 1/2 cycle ≤ 1/2 cycle

Input Specifications

Output Specifications

RA ..10 .. .. RA ..25 .. .. RA ..50 .. .. RA ..90 .. ..

Rated operational current AC 1 10 Arms 25 Arms 50 Arms 90 Arms

AC 3 3 Arms 5 Arms 15 Arms 20 Arms

Minimum operational current 20 mArms 20 mArms 20 mArms 20 mArms

Rep. overload current t=1 s ≤ 35 Arms ≤ 55 Arms ≤ 125 Arms ≤ 150 Arms

Non-rep. surge current t=20 ms 160 A

p

250 A

p

600 A

p

1000 A

p

Off-state leakage current

@ rated voltage, frequency ≤ 2.5 mArms ≤ 3 mArms ≤ 3 mArms ≤ 3 mArms

I

2

t for fusing t=1-10 ms ≤ 130 A2s ≤ 310 A2s ≤ 1800 A2s ≤ 5000 A

2

s

Critical dI/dt ≥ 100 A/µs ≥ 100 A/µs ≥ 100 A/µs ≥ 100 A/µs

On-state voltage drop

@ rated current ≤ 1.6 Vrms ≤ 1.6 Vrms ≤ 1.6 Vrms ≤ 1.6 Vrms
Critical dV/dt commutating ≥ 500 V/µs ≥ 500 V/µs ≥ 500 V/µs ≥ 500 V/µs
Critical dV/dt off-state ≥ 500 V/µs ≥ 500 V/µs ≥ 500 V/µs ≥ 500 V/µs

RA ..10 .. .. RA ..25 .. .. RA ..50 .. .. RA ..90 .. ..

Operating temperature -40°C to +100°C -40°C to +100°C -40°C to +100°C -40°C to +100°C
Storage temperature -40°C to +100°C -40°C to +100°C -40°C to +100°C -40°C to +100°C
Junction temperature ≤ 125°C ≤ 125°C ≤ 125°C ≤ 125°C

R

th

junction-case ≤ 2.0 K/W ≤ 1.25 K/W ≤ 0.65 K/W ≤ 0.3 K/W

R

th

junction to ambient ≤ 12.5 K/W ≤ 12 K/W ≤ 12 K/W ≤ 12 K/W

Thermal Specifications

Specifications are subject to change without notice 3

RA 24.. .. 06, RA 44.. .. 08, RA 48.. .. 12

Rated insulation voltage

Input to output ≥ 4000 VACrms

Rated insulation voltage

Output to case ≥ 4000 VACrms

Insulation resistance

Input to output ≥ 10

10

Ω

Insulation resistance

Ouput to case ≥ 1010Ω

Insulation capacitance

Input to output ≤ 8 pF

Insulation capacitance

Output to case ≤ 100 pF

Insulation

Wiring Diagram

Functional Diagram

Control
input

Mains input/load output

Control
input

Line/load

Dimensions

Load output/mains input

Weight Approx. 110 g
Housing material Noryl GFN 1, black
Base plate 10, 25, 50 A Aluminium, nickel-plated

90 A Copper, nickel-plated
Potting compound Polyurethane
Relay

Mounting screws M5

Mounting torque ≤ 1.5 Nm

Control terminal

Mounting screws M3 x 6

Mounting torque ≤ 0.5 Nm

Power terminal

Mounting screws M5 x 6

Mounting torque ≤ 2.4 Nm

Housing Specifications

** = ±0.4 mm
*** = ±0.5 mm

**

**

***

*** ***

***

Accessories

Protection cover
Heatsinks
DIN rail adapter
Varistors
Fuses

For further information refer
to "General Accessories".

4 Specifications are subject to change without notice

RA 24.. .. 06, RA 44.. .. 08, RA 48.. .. 12

Heatsink Dimensions (load current versus ambient temperature)

16

15

14

13

12

11

10

9

7

5

3

1

Load
current [A]

Thermal resistance
[K/W]

T

A

Ambient temp. [°C]

Power
dissipation [W]

Power
dissipation [W]

2 1.7 1.4 1 0.71 0.40 32

2.5 2.1 1.8 1.4 1 0.66 27

3.1 2.7 2.3 1.9 1.4 1 23

4. 3.5 3 2.5 2 1.4 20

4.9 4.3 3.7 3.1 2.5 1.9 16

6.2 5.4 4.6 3.9 3.1 2.3 13

8.1 7.1 6.1 5.1 4 3 10

11.3 9.9 8.5 7.1 5.6 4.2 7

- 15.6 13.3 11.1 8.9 6.7 5

- - - - 18.7 14 2

20 30 40 50 60 70

25

22.5

20

17.5

15

12.5

10

7.5

5

2.5

T

A

Ambient temp. [°C]

Load
current [A]

RA ..50 .. ..

T

A

Ambient temp. [°C]

50

45

40

35

30

25

20

15

10

5

Power
dissipation [W]

Thermal resistance
[K/W]

Load
current [A]

Thermal resistance
[K/W]

2.7 2.2 1.8 1.3 0.87 0.41 22

3.1 2.6 2.1 1.7 1.2 0.65 20

3.7 3,1 2.6 2 1.5 0.92 18

4.3 3.7 3.1 2.5 1.9 1.2 16

5 4.3 3.7 3 2.3 1.6 15

5.9 5.1 4.4 3.6 2.8 2.1 13

6.9 6 5.2 4.3 3.5 2.6 12

7.9 6.9 5.9 4.9 4 3 10

10.8 9.5 8.1 6.8 5.4 4.1 7

- 14.2 12.2 10.2 8.1 6.1 5

- - - - 14.6 10.9 3

------1

20 30 40 50 60 70

0.92 0.76 0.60 0.45 0.29 - 63

1.2 0.99 0.80 0.62 0.44 0.26 55

1.5 1.3 1.1 0.85 0.63 0.42 47

1.9 1.6 1.4 1.1 0.89 0.63 40

2.4 2.1 1.8 1.5 1.2 0.91 33

3 2.7 2.3 1.9 1.5 1.1 26

3.9 3.5 3 2.5 2 1.5 20

5.5 4.8 4.1 3.4 2.7 2.1 15

8.6 7.5 6.4 5.4 4.3 3.2 9

17.9 15.6 13.4 11.2 8,9 6.7 4

20 30 40 50 60 70

Thermal resistance
[K/W]

Load
current [A]

Power
dissipation [W]

RA ..90 .. ..

T

A

Ambient temp. [°C]

0.63 0.53 0.42 0.32 - - 97

0.81 0.69 0.57 0.45 0.33 - 84

1 0.89 0.75 0.61 0.47 0.33 71

1.3 1.2 1 0.83 0.66 0.49 59

1.7 1.5 1.3 1.1 0.85 0.64 47

2.2 1.9 1.7 1.4 1.1 0.83 36

3.1 2.7 2.3 1.9 1.5 1.2 26

4.8 4.2 3.6 3 2.4 1.8 17

10 8.8 7.5 6.3 5 3.8 8

20 30 40 50 60 70

90

80

70

60

50

40

30

20

10

Carlo Gavazzi Heatsink

(see Accessories)

No heatsink required
RHS 100 Assy
RHS 301 Assy
RHS 301 F Assy
Consult your distributor

Heatsink Selection

Thermal resistance

R

th s-a

> 12.5 K/W

3.0 K/W

0.8 K/W

0.25 K/W

< 0.25 K/W

Compare the value found in the current versus temperature
chart with the standard heatsink values and select the heat­sink with the next lower value.

RA ..10 .. .. RA ..25 .. ..

Specifications are subject to change without notice 5

Applications

Thermal characteristics

The thermal design of Solid
State Relays is very impor-

tant. It is essential that the user
makes sure that cooling is ad­equate and that the maximum
junction temperature of the re­lay is not exceeded.

This relay is designed for use
in applications in which it is
exposed to high surge condi­tions. Care must be taken to
ensure proper heatsinking
when the relay is to be used at
high sustained currents. Ade­quate electrical connection
between relay terminals and
cable must be ensured.

RA 24.. .. 06, RA 44.. .. 08, RA 48.. .. 12

Heat flow

Heatsink
temperature

R

th

j-c

R

th

c-s

Rths-a

Junction
temperature

Case
temperature

Ambient
temperature

Thermal resistance:
R

th

j-c = junction to case

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 en­sure uninhibited heat transfer
and high thermal fatigue
strength.

The relay has been designed
for applications requiring lar­ge numbers of load cycles.

Power dissipation

The power dissipation for in­termittent use is calculated ac­cording to the following for­mula:

t

on

t

off

OFF

ON

I

rms

=

I

ON

2

x t

ON

tON+ 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.

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 cal­culated on the basis of the
ambient temperature and the
increase in temperature.

R

th

c-s = case to heatsink

R

th

s-a = heatsink to ambient