RA4825-D12

SSR, PANEL MOUNT, 530VAC, 32VDC, 25A

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Manufacturer: CARLO GAVAZZI
Product type: Solid State Relays
Load Current: 25A
Relay Mounting: Panel Mount
Switching Mode: Zero Crossing
Relay Terminals: Screw
Control Voltage Max: 32VDC
Control Voltage Min: 3VDC
Contact Configuration: SPST-NO
Operating Voltage Max: 530VAC
Operating Voltage Min: 42VAC

Delivery and price
Units per pack	1
Price	51.19 €
Current stock	10+
Lead time	30 days

Datasheet

## **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: 10, 25, 50  and 90 AACrms** 

- **Blocking 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** 

- **Isolation: OPTO (input-output) 4000 VACrms** 

## **Product Description** ~~om~~ 

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- 

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. 

## **Ordering Key** 

**Solid State Relay Switching mode Rated operational voltage Rated operational current Control voltage Blocking voltage** 

## **RA 24 10 LA 06** 

## **Type Selection** 

|**Type Selectionype Selectione Selection**|**Type Selectionype Selectione Selection**||
|---|---|---|
|**Switching mode**||**Rated operational**<br>**Rated operational**<br>**Control voltage**<br>**Blocking voltage**<br>**voltage**<br>**current**|
|A: Zero switching<br>24: 230 VACrms<br>10: 10 AACrms<br>-D:   3 to 32 VDC<br>06: 650 Vp<br>44: 400 VACrms<br>25: 25 AACrms<br>LA: 10 to 90 VAC/DC<br>08: 850 Vp<br>48: 480 VACrms<br>50: 50 AACrms<br>HA: 90 to 280 VAC/DC<br>12: 1200 Vp<br>90: 90 AACrms<br>**Selection Guide**|||
|**Rated opera-**<br>**Blocking**<br>**Control voltage**<br>**Rated operational current**|||
|**tional voltage**<br>**voltage**||**10 AACrms**<br>**25 AACrms**<br>**50 AACrms**<br>**90 AACrms**|
|||3 to 32 VDC<br>**RA 2410 -D 06**<br>**RA 2425 -D 06**<br>**RA 2450 -D 06**<br>**RA 2490 -D 06**|
|230 VACrms<br>650 Vp||10 to 90 VAC/DC<br>**RA 2410 LA 06**<br>**RA 2425 LA 06**<br>**RA 2450 LA 06**<br>**RA 2490 LA 06**|
|||90 to 280 VAC/DC<br>**RA 2410 HA 06**<br>**RA 2425 HA 06**<br>**RA 2450 HA 06**<br>**RA 2490 HA 06**|
|||3 to 32 VDC<br>**RA 4410 -D 08**<br>**RA 4425 -D 08**<br>**RA 4450 -D 08**<br>**RA 4490 -D 08**|
|400 VACrms<br>850 Vp||10 to 90 VAC/DC<br>**RA 4410 LA 08**<br>**RA 4425 LA 08**<br>**RA 4450 LA 08**<br>**RA 4490 LA 08**|
|||90 to 280 VAC/DC<br>**RA 4410 HA 08**<br>**RA 4425 HA 08**<br>**RA 4450 HA 08**<br>**RA 4490 HA 08**|
|||3 to 32 VDC<br>**RA 4810 -D 12**<br>**RA 4825 -D 12**<br>**RA 4850 -D 12**<br>**RA 4890 -D 12**|
|480 VACrms<br>1200 Vp||10 to 90 VAC/DC<br>**RA 4810 LA 12**<br>**RA 4825 LA 12**<br>**RA 4850 LA 12**<br>**RA 4890 LA 12**|
|||90 to 280 VAC/DC<br>**RA 4810 HA 12**<br>**RA 4825 HA 12**<br>**RA 4850 HA 12**<br>**RA 4890 HA 12**|



**2-60** 

Specifications are subject to change without notice (28.02.2007) 

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

## **General Specifications** 

||**RA 24.. .. 06**||**RA 44.. .. 08**||**RA 48.. .. 12**|
|---|---|---|---|---|---|
|Operational voltage range|24 to 280 VACrms||42 to 480 VACrms||42 to 530 VACrms|
|Blockingvoltage|≥650 Vp||≥850 Vp||≥1200 Vp|
|Zero voltage turn-on|≤20 V||≤40 V||≤40 V|
|Operational frequencyrange|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||UL, CSA||UL, CSA|



## **Input 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-upvoltage|≤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 timepick-up|≤1/2 cycle||≤1 cycle||≤1 cycle|
|Controlpulse width|≥0.5 ms||≥0.5 ms||≥0.5 ms|
|Response time drop-out|≤1/2 cycle||≤1/2 cycle||≤1/2 cycle|



## **Output Specifications** 

||**RA ..10 .. ..**|**RA ..25 .. ..**|**RA ..50 .. ..**|**RA ..90 .. ..**|
|---|---|---|---|---|
|Rated operational current AC 51|16 Arms|25 Arms|50 Arms|90 Arms|
|AC 53a|3 Arms|5 Arms|15 Arms|20 Arms|
|Minimum operational current|150 mArms|150 mArms|250 mArms|400 mArms|
|Rep. overload current t=1 s|≤35 Arms|≤55 Arms|≤125 Arms|≤150 Arms|
|Non-rep. surge current t=10 ms|160 Ap|325 Ap|600 Ap|1150 Ap|
|Off-state leakage current|||||
|@rated voltage and frequency|≤2.5 mArms|≤3 mArms|≤3 mArms|≤3 mArms|
|I2t for fusingt=10 ms|≤130 A2s|≤525 A2s|≤1800 A2s|≤6600 A2s|
|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|



## **Thermal Specifications** 

||**RA ..10 .. ..**||**RA ..25 .. ..**||**RA ..50 .. ..**||**RA ..90 .. ..**|
|---|---|---|---|---|---|---|---|
|Operating temperature|-20°to +70°C<br>(-4° to +158°F)||-20°to +70°C<br>(-4° to +158°F)||-20°to +70°C<br>(-4° to +158°F)||-20°to +70°C<br>(-4° to +158°F)|
|Storage temperature|-40°to +100°C<br>(-40° to +212°F)||-40°to +100°C<br>(-40° to +212°F)||-40°to +100°C<br>(-40° to +212°F)||-40°to +100°C<br>(-40° to +212°F)|
|Junction temperature|≤125°C(≤257°F)||≤125°C(≤257°F)||≤125°C(≤257°F)||≤125°C(≤257°F)|
|Rth junction to case|≤2.0 K/W||≤1.25 K/W||≤0.65 K/W||≤0.3 K/W|
|Rthjunction to ambient|≤12.5  K/W||≤12 K/W||≤12 K/W||≤12 K/W|



**2-61** 

Specifications are subject to change without notice (28.02.2007) 

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

## **Isolation** 

## **Accessories** 

|**Isolation**||
|---|---|
|Rated isolation voltage||
|Input to output|≥4000 VACrms|
|Rated isolation voltage<br>Output to case<br>Insulation resistance|≥4000 VACrms|
|Input to output|≥1010 Ω|
|Insulation resistance||
|Ouput to case|≥1010 Ω|
|Insulation capacitance||
|Input to output|≤8pF|
|Insulation capacitance||
|Output to case|≤100 pF|



Protection cover Heatsinks DIN rail adapter Varistors Fuses 

For further information refer to "General Accessories". 

## **Wiring Diagram** 

## **Functional Diagram** 

**==> picture [209 x 114] intentionally omitted <==**

**----- Start of picture text -----**<br>
Mains input/load output<br>(2)<br>L+/L@—4 —-4<br>Control<br>input D<br>p<br>L-/L(4)“ A sf, = | ex<br>Load output/mains input<br>**----- End of picture text -----**<br>


**==> picture [217 x 16] intentionally omitted <==**

**----- Start of picture text -----**<br>
Control<br>input vk] Line/load<br>**----- End of picture text -----**<br>


## **Housing Specifications** 

## **Dimensions** 

** Weight Approx. 110 g Housing material Noryl GFN 1, black Base plate          10, 25, 50 A Aluminium, nickel-plated 90 A Copper, nickel-plated ~~__sdsi—iwsti(~~ Potting compound Polyurethane a ~~———ll LF~~ Relay 2XM5 Mounting screws M5 Mounting torque ≤ 1.5 Nm Control terminal Mounting screws M3 x 6 Mounting torqueg torque torquequeue ≤ 0.5 Nm ~~ltt i tti‘i—sS~~ Power terminal “) | | | | COMPOUND | ~~—_~~ Mounting screws M5 x 6 ** = ± 0.4 mm ** Mounting torque ≤ 2.4 Nm *** = ± 0.5 mm aidan 2XM3 

Control terminal Mounting screws M3 x 6 Mounting torqueg torque torquequeue ≤ 0.5 Nm ~~ltt i tti‘i—sS~~ Power terminal ~~—_~~ Mounting screws M5 x 6 Mounting torque ≤ 2.4 Nm 

All dimensions in mm 

**2-62** 

Specifications are subject to change without notice (28.02.2007) 

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

## **Heatsink Dimensions (load current versus ambient temperature)** 

**RA ..10 .. ..** 

**==> picture [200 x 242] intentionally omitted <==**

**----- Start of picture text -----**<br>
||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
|Load|Thermal resistance|Power|
|current [A]|[K/W]|dissipation [W]|
|16|2.7|2.2|1.8|1.3|0.87|0.41|22|
|||||fT|tT|
|15|3.1|2.6|2.1|1.7|1.2|0.65|20|
|14|Sere|3.7|3,1|2.6|2|1.5|0.92|18|
|13|4.3|3.7|3.1|2.5|1.9|1.2|16|
|||||||||||
|12|5|4.3|3.7|3|2.3|1.6|15|
|ee|
|11|5.9|5.1|4.4|3.6|2.8|2.1|13|
|||||||||||ht|
|10|6.9|6|5.2|4.3|3.5|2.6|12|
|ee|
|9|7.9|6.9|5.9|4.9|4|3|10|
|||||||||||
|7|10.8|9.5|8.1|6.8|5.4|4.1|7|
|||||||||||
|5|-|14.2|12.2|10.2|8.1|6.1|5|
|3|||-|||-|||-|||-|||14.6|10.9|3|
|||||||vf|||
|1|-|-|-|-|-|-|1|
|||||||TT|
|20|30|40|50|60|70|TA|
|Ambient temp. [°C]|

**----- End of picture text -----**<br>


**RA ..25 .. ..** 

**==> picture [207 x 211] intentionally omitted <==**

**----- Start of picture text -----**<br>
|||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|Load|Thermal resistance|Power|
|current [A]|[K/W]|dissipation [W]|
|25|2|1.7|1.4|1|0.71|0.40|32|
|||||||||
|22.5|2.5|2.1|1.8|1.4|1|0.66|27|
|20|3.1|2.7|2.3|1.9|1.4|1|23|
|ee|
|17.5|4.|3.5|3|2.5|2|1.4|20|
|||||||||||
|15|4.9|4.3|3.7|3.1|2.5|1.9|16|
|ee|
|12.5|6.2|5.4|4.6|3.9|3.1|2.3|13|
|||||||||||
|10|8.1|7.1|6.1|5.1|4|3|10|
|||||||||
|7.5|11.3|9.9|8.5|7.1|5.6|4.2|7|
|5|Pp|-|||15.6|||13.3|||11.1|8.9|6.7|5|
|2.5|||-|of|-|||-||TT|-|18.7|14|2|
|P||20|||30||TT|40|50|60|70|TA|
|Ambient temp. [°C]|

**----- End of picture text -----**<br>


## **RA ..50 .. ..** 

## **RA ..90 .. ..** 

**==> picture [463 x 211] intentionally omitted <==**

**----- Start of picture text -----**<br>
|||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|Load|Thermal resistance|Power|Load|Thermal resistance|Power|
|current [A]|[K/W]|dissipation [W]|current [A]|[K/W]|dissipation [W]|
|50|0.92|0.76|0.60|0.45|0.29|-|63|90|0.63|0.53|0.42|0.32|-|-|97|
|I|ee|
|45|1.2|0.99|0.80|0.62|0.44|0.26|55|80|0.81|0.69|0.57|0.45|0.33|-|84|
|||||||||rT||||||||Tt|
|40|1.5|1.3|1.1|0.85|0.63|0.42|47|70|1|0.89|0.75|0.61|0.47|0.33|71|
|||||||||ee|
|35|1.9|1.6|1.4|1.1|0.89|0.63|40|60|1.3|1.2|1|0.83|0.66|0.49|59|
|||||||||ft||||||||Tt|
|30|ee|2.4|2.1|1.8|1.5|1.2|0.91|33|50|ee|1.7|1.5|1.3|1.1|0.85|0.64|47|
|25|3|2.7|2.3|1.9|1.5|1.1|26|40|2.2|1.9|1.7|1.4|1.1|0.83|36|
|||||||ft|||||||||fT|||
|20|3.9|3.5|3|2.5|2|1.5|20|30|3.1|2.7|2.3|1.9|1.5|1.2|26|
|||||||||||a|
|15|5.5|4.8|4.1|3.4|2.7|2.1|15|20|4.8|4.2|3.6|3|2.4|1.8|17|
|||||||||||||||||||||
|10|8.6|7.5|6.4|5.4|4.3|3.2|9|10|10|8.8|7.5|6.3|5|3.8|8|
|||||||fT|||ee|
|5|ee|17.9|15.6|13.4|11.2|e|8,9|e|6.7|4|20|30|40|ee|50|ee|60|70|TA|
|20|30|40|50|60|70|TA|Ambient temp. [°C]|
|Ambient temp. [°C]|

**----- End of picture text -----**<br>


## **Heatsink Selection** 

**==> picture [209 x 80] intentionally omitted <==**

**----- Start of picture text -----**<br>
|||||
|---|---|---|---|
|Carlo Gavazzi Heatsink|Thermal resistance|
|(see Accessories)|
|No heatsink required|Rth s-a|> 12.5|K/W|
|RHS 100 Assy|3.0 K/W|
|RHS 301 Assy|0.8   K/W|
|RHS 301 F Assy|0.25 K/W|
|Consult your distributor|< 0.25 K/W|

**----- End of picture text -----**<br>


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

**2-63** 

Specifications are subject to change without notice (28.02.2007) 

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

## **Applications** 

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. 

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. 

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. 

## **Thermal characteristics** 

The thermal design of Solid State Relays is very impor- 

**==> picture [223 x 90] intentionally omitted <==**

**----- Start of picture text -----**<br>
Heat flow<br>Rth j-c Rth c-s Rth s-a<br>Junction  Case Heatsink Ambient<br>temperature temperature temperature temperature<br>**----- End of picture text -----**<br>


## **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: 

**==> picture [51 x 22] intentionally omitted <==**

**----- Start of picture text -----**<br>
ON<br>OFF<br>ton toff<br>**----- End of picture text -----**<br>


ION[2] x  tON Irms = tON + tOFF 

Ex: RA 24 50 -D 06: Load current = 45 A tON = 30 s t OFF = 15 s 

45[2] x 30 Irms = ‘ / 30 + 15 The rms current will be 36.7 A. 

Thermal resistance: Rth c-s = case to heatsink Rth j-c = junction to case Rth s-a = heatsink to ambient 

**2-64** 

Specifications are subject to change without notice (28.02.2007)

Updated at February 9, 2023

Founded in Milan in 1931, Carlo Gavazzi is a globally recognized leader in the design and manufacture of high-quality automation components. For nearly a century, the company has driven technological innovation in the industrial and building automation markets. With ISO 9001-certified production facilities across Europe and Asia, Carlo Gavazzi delivers state-of-the-art solutions tailored for demanding applications, including HVAC, renewable energy, semiconductor manufacturing, and electric vehicle charging infrastructure. Our extensive portfolio of Carlo Gavazzi components focuses heavily on their industry-leading switching and sensing technologies. We carry a comprehensive selection of solid state relays, contactors, and power relays engineered for exceptional reliability and thermal performance. Alongside these robust switching solutions, our range features a wide array of precision sensors, with a strong emphasis on proximity switches and light sensors that are critical for automated manufacturing processes, mobile equipment, and access control systems. Beyond core sensing and switching, the Carlo Gavazzi lineup extends into essential power management, circuit protection, and control devices. This includes highly efficient AC/DC converters, thermal magnetic circuit breakers, and advanced panel instrumentation designed to monitor and optimize energy efficiency. From current sensing transformers to motor starters, engineers consistently trust Carlo Gavazzi to provide competitive, dependable, and forward-thinking components for their most complex automation challenges.

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