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RZ3A40D75 – SSR 3/P 24-440V 75A 4-32VDC
Carlo Gavazzi RZ3A40D75 three phase solid state relay with 75 A load rating, 24–440 V AC operation and 4–32 V DC control input for industrial switching applications.
£225.44
Why Choose the Carlo Gavazzi RZ3A40D75 Solid State Relay?
The Carlo Gavazzi RZ3A40D75 is a powerful three-phase solid state relay (SSR) designed for reliable switching of industrial electrical loads including heating elements, motors and transformers. As part of the proven Carlo Gavazzi RZ3A solid state relay series, it provides zero-cross switching, high electrical isolation and dependable semiconductor-based control for demanding automation and process applications.
This relay uses advanced solid state switching technology to provide silent operation, long service life and reliable performance where frequent switching cycles are required. The RZ3A series incorporates built-in overvoltage protection, integral snubber protection and robust construction suitable for industrial control panels and machinery applications.
With a 75 A rated operational current, 24–440 V AC operating voltage range and a 4–32 V DC control input, the RZ3A40D75 is ideal for three-phase industrial load switching in heating control, process equipment and automation systems.
Key Advantages
- Industrial three-phase solid state relay designed for reliable switching.
- 75 A load current capability for high-power industrial applications.
- Zero-cross switching technology reduces electrical stress during operation.
- 4–32 V DC control input compatible with PLCs and automation controllers.
- Built-in overvoltage protection with integral varistor.
- Silent semiconductor switching with high switching cycle capability.
Key Features
- Carlo Gavazzi RZ3A solid state relay series.
- Three-phase panel mount solid state relay.
- 75 A rated operational current.
- 24–440 V AC operating voltage range.
- 4–32 V DC control voltage range.
- Zero-cross switching operation.
- Built-in varistor and snubber network protection.
- LED indication of control input status.
- Screw terminals with captive clamp connection.
Reliable Solid State Switching for Industrial Control
Solid state relays such as the Carlo Gavazzi RZ3A40D75 provide fast, silent and reliable switching for industrial loads. Semiconductor technology eliminates mechanical wear points, making these relays suitable for applications requiring frequent operation and long service life.
The RZ3A series is designed for machine builders and automation engineers requiring dependable three-phase switching performance. Its integrated protection features, zero-cross switching and robust panel mounting format enable reliable operation in modern industrial systems.
Typical Applications
- Industrial heating systems and heating elements.
- Plastic processing and extrusion machinery.
- Thermoforming and moulding equipment.
- Industrial ovens and dryers.
- Motors, transformers and process equipment.
- Automation and machine control systems.
Technical Specifications
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| Device Type | Solid State Relay | |
|---|---|---|
| Terminal Type | Screw | |
| Mounting Type | Panel | |
| Switching Current (A) | 75 A | |
| Coil / Supply Voltage | 12 V DC, 24 V DC, 5 V DC | |
| IP Rating | IP10 | |
| Manufacturer | Carlo Gavazzi | |
| Series | RZ3A | |
| Model | RZ3A40D75 | |
| Product type | Three-phase solid state relay | |
| Number of poles | 3 | |
| Switching mode | Zero-cross switching | |
| Rated operational current | 75 A AC | |
| AC-53a motor current rating | 20 A | |
| Operating voltage | 24–440 V AC | |
| Control voltage | 4–32 V DC | |
| Frequency range | 45–65 Hz | |
| Protection rating | IP10 | |
| Mounting type | Panel mounting | |
| Terminal type | Screw connection with captive clamp | |
| Dimensions (H × W × D) | approx. 103 × 73.5 × 41 mm | |
| Weight | approx. 380 g | |
| Operating temperature | -30 to +80 °C |
Frequently Asked Questions
What is the Carlo Gavazzi RZ3A40D75 used for?
The RZ3A40D75 is a three-phase solid state relay used for switching industrial loads including heating elements, motors and transformers.
What current rating does this solid state relay support?
The relay supports a rated operational current of 75 A AC for suitable industrial applications.
What control voltage does the RZ3A40D75 require?
The relay uses a 4–32 V DC control input suitable for industrial automation controllers.
What switching method does this relay use?
The RZ3A40D75 uses zero-cross switching to reduce electrical stress and improve switching reliability.
Where is this solid state relay installed?
The relay is typically installed on electrical panels or control systems with suitable heat dissipation for the connected load.
Trusted by Industrial Automation Engineers
Carlo Gavazzi RZ3A solid state relays are widely used in industrial automation, heating control and machine applications where reliable three-phase switching performance is required.
