LEGRAND 42724

Legrand 400VA Safety and Isolating Transformer

Description

The Legrand 427 24 is a high-quality, single-phase safety and isolating transformer designed for industrial control and automation applications. With a power rating of 400VA, it reliably steps down higher voltages to safe extra-low voltages (SELV). Its robust IP55 enclosure provides excellent protection against dust and water, making it suitable for demanding environments. This transformer is an essential component for powering control circuits, relays, contactors, and signaling devices safely and efficiently.

Specifications

• Manufacturer: Legrand
• Type: 427 24
• Power Rating: 400 VA
• Primary Voltage: 230 V / 400 V AC
• Secondary Voltage: 24 V / 48 V AC
• Frequency: 50/60 Hz
• Ingress Protection: IP 55
• Insulation Class: Class B
• Phase: 1

Label Info

• PRI: 0 – 230V – 400V
• SEC: 24V – 48V
• Standard: IEC/EN 61558-2-4

Application

This transformer is commonly used in machine building, panel construction, and industrial automation to create isolated low-voltage circuits for operator controls, sensors, and other sensitive electronic components, ensuring personnel safety and equipment protection.

Country of Origin

Made in France.

CO2 Impact

Choosing this reused Legrand transformer over a new one prevents the emission of approximately 94.5 kg of CO2, contributing to a more sustainable industrial operation.

Availability

This item is in stock and ready for immediate dispatch. Order now from spareparts2day for expert support and fast delivery.

FAQ

What is the primary application for an IP55 rated transformer like the Legrand 427 24?
The IP55 rating indicates protection against dust ingress and low-pressure water jets from any direction. This makes it ideal for industrial environments where it might be exposed to dust, moisture, or cleaning processes, such as in machine control cabinets or decentralized control stations on a factory floor.

How do I correctly wire the multi-tap primary (230/400V) and secondary (24/48V) windings?
The wiring diagram is printed on the transformer label. For the primary, you connect to the 0V and 230V terminals for a 230V supply, or the 0V and 400V terminals for a 400V supply. For the secondary, connecting between the two outer output terminals provides 48V, while connecting from the center tap to one of the outer terminals provides 24V. Always verify with the diagram and de-energize the circuit before making connections.

Is this a safety isolating transformer, and what does that mean?
Yes, according to the standard IEC/EN 61558-2-4, this is a safety isolating transformer. This means it has reinforced insulation between the primary and secondary windings, providing galvanic isolation. This is critical for creating safe extra-low voltage (SELV) or protected extra-low voltage (PELV) circuits, protecting personnel from electric shock.

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Last Update: Friday, March 13, 2026