Legrand RX3 RCCB, 30mA Sensitivity, 415V AC (Four Pole)

Product Highlights

• Brand: Legrand
• Product: RX³ Four Pole RCCB, 30mA
• Variants: 25A, 40A, 63A
• Product Codes: 402519 (25A), 402520 (40A), 402521 (63A)
• Poles: 4 Pole (3 Phase + Neutral)
• Sensitivity: 30mA, Type AC
• Voltage: 400 / 415V AC, 50 Hz
• Size: 4 modules (71.2 mm), 35 mm DIN rail mount
• Packaging: 01 Nos
• Not Included (Purchase Separately): MCBs and distribution board
• Application: Earth leakage protection for three-phase homes, offices, shops and workshops

Product Description

Legrand RX³ Four Pole RCCB protects three-phase 415V installations against earth leakage. It constantly compares the current flowing through all three phases and the neutral, and switches off the supply as soon as current leaks to earth – for example through damaged insulation, a faulty appliance or a person touching a live part. Its 30mA sensitivity is the standard level for protecting people from electric shock.

It takes 4 modules (71.2 mm) on a standard DIN rail, with touch-proof IP20 terminals for safer wiring and a front test button to check it is working. Choose 25A, 40A or 63A to match your installation. Please note an RCCB protects against earth leakage only – it does not protect against overload or short circuit, so it must always be used with suitable MCBs.

Key Features

• 3-Phase Earth Leakage Protection: Monitors all three phases and the neutral
• 30mA Sensitivity: Standard level for protection against electric shock
• Test Button: Front button to check the RCCB trips correctly
• Touch-Proof Terminals: IP20 terminal protection for safer wiring
• 10 kA Conditional Short-Circuit Rating: When protected by a suitable upstream MCB or fuse
• Three Ratings: 25A, 40A and 63A

Product Specifications Table

Technical Specifications (Quick Reference)

Which Rating to Choose

• 25A: Smaller three-phase installations
• 40A: Medium-sized three-phase homes and small commercial units
• 63A: Larger homes and commercial installations with higher loads
• Match the MCB: The RCCB rating should be equal to or higher than the main MCB protecting it

Installation & Safety

Important – Read Before Use

• Licensed Electrician Only: Three-phase 415V work must be done by a licensed electrician
• Always Use MCBs: An RCCB does not protect against overload or short circuit
• Connect the Neutral: The neutral must pass through the RCCB for it to work correctly
• Test Regularly: Press the test button about once a month to check it trips

FAQs

1) Does an RCCB protect against overload and short circuit?

No. An RCCB only protects against earth leakage. It must be used together with suitable MCBs, which protect the wiring against overload and short circuit.

2) Why is a three-phase RCCB still 30mA?

30mA is the standard sensitivity for protecting people from electric shock. The danger to a person is the same whether the supply is single-phase or three-phase, so the same 30mA level is used.

3) Does the neutral have to be connected?

Yes. The RCCB works by comparing the current in the three phases with the current returning through the neutral. If the neutral is not connected through the RCCB, it cannot detect leakage correctly and may not work as intended.

4) What does Type AC mean?

Type AC RCCBs detect standard alternating-current leakage, which suits typical lighting, heating and general household loads. Some modern equipment with electronic drives (such as certain inverter appliances or EV chargers) may need a Type A RCCB – check the equipment manufacturer's advice.

5) Which rating should I choose?

25A suits smaller three-phase installations, 40A suits most medium-sized homes and small commercial units, and 63A suits larger installations. The RCCB rating should be equal to or higher than the main MCB that protects it – your electrician can confirm the right size.

6) Can I run it above its rated current?

No. Never run a continuous load above the RCCB's rating (25A, 40A or 63A). Doing so can overheat the contacts and make the device unsafe.

• Authentic Legrand Product: Verified genuine product sourced from authorized channels
• 60-Minute Bangalore Delivery: Express delivery to active service zones for urgent needs
• Three Ratings: 25A, 40A and 63A to match your distribution board

Returns & Exchange Policy

1. Return within 24 hours of delivery for:
   • Damaged or defective product
   • Wrong or missing item
2. Product cannot be returned once installed or used
3. Refer to Refund Policy for complete details