Legrand 411761 DX3-ID 4P 63 A 30 mA Type A RCCB

411761: Legrand DX3-ID 4-pole 63 A 30 mA type A RCCB, decoded

The Legrand 411761 is a DX3-ID residual current circuit breaker (RCCB) with four poles, a rated current of 63 A, a rated residual current of 30 mA and type A detection. Type A means the device responds to sinusoidal AC residual currents and to pulsating DC residual currents. The RCCB is 4 modules wide (71.2 mm), has the neutral on the right-hand side and works on 400 V AC, 50 Hz. Seven Star LLC supplies 411761 in Oman and the GCC as an independent supplier in Muscat.

An RCCB protects people and installations against earth leakage, but it does not protect against overload or short circuit. It must always be paired with an upstream or series circuit breaker or fuse, which is a point that designers and buyers often overlook when specifying residual current devices.

Decoding the description of 411761

Technical specifications for 411761

How the 411761 detects leakage

Inside the device a toroidal sensor encircles all four conductors. In a healthy circuit the vector sum of the currents is zero. When part of the current flows to earth, for example through a damaged cable or a person, the sum becomes non-zero and an electromagnetic relay opens the contacts. The DX3-ID is described in the data sheet as an electromagnetic residual current function with a current-sensing relay.

The data sheet states that the device is tested with 20,000 mechanical operations, 10,000 operations under load and 2,000 trips by the test button or by fault current. It is not suitable for direct current or 400 Hz, and the data sheet adds a note for 60 Hz use that excludes some 40, 63 and 80 A type A and AC versions with 30 mA sensitivity, so 411761 should be applied on 50 Hz networks.

Where 411761 fits and related parts

Fit 411761 at the head of a group of final circuits, each protected by its own MCB, such as 407929 or 409071 for four-pole feeders or smaller single-phase breakers for lighting and sockets. Several RCCBs in a board give discrimination between groups: a fault trips only the affected group. The same DX3-ID series covers 25, 40, 63, 80 and 100 A, in AC, A, AC-S and A-S types with 30, 100, 300 and 500 mA sensitivity. The 30 mA type A version here is the usual choice for socket outlets, workshops and areas where people can touch live equipment. Upstream protection should be sized so that the RCCB 63 A rating is not exceeded.

Selection checklist for 411761

• Rated current: 63 A or more than the sum of group loads, with a series MCB no larger than 63 A.
• Sensitivity: 30 mA for people protection; use 100 to 500 mA or selective versions for fire or discrimination.
• Type: A covers pulsating DC; consider F or B types where inverters or drives are present.
• Network: 400 V, 50 Hz, with neutral on the right-hand side.
• Back-up protection: 10 kA conditional short-circuit rating needs an appropriate MCB or fuse upstream.
• Environment: the data sheet lists operation in humid atmospheres, including chlorine-polluted pool-type areas.

Installation, testing and maintenance of 411761

Snap the device onto the rail and connect three phases and the neutral to the marked terminals. The neutral is on the right side, so connect it correctly or the device will not work. Tighten the terminals to the torque in the instruction sheet, and strip conductors to the length shown. After installation press the test button; the device should trip. Repeat the test periodically, for example every six months, and record the result alongside the reference 411761. Because the device is installed in a row, it can be replaced mid-row without disconnecting neighbouring products when the busbar is used.

Typical applications in Oman and the GCC

RCCBs with 30 mA sensitivity are common in commercial buildings, camps, workshops and utility boards in Oman and the GCC, where wet cleaning, outdoor sockets and temporary power increase earth-leakage risk. The data sheet notes suitability for humid atmospheres with chlorine, such as pool areas. In hot rooms, keep the operating temperature below 60 °C and avoid dense packing with heavily loaded neighbours.

Family table around 411761

Information to send with an RFQ for 411761

• Reference 411761 and the quantity, including spares for panel maintenance.
• Rated current, number of poles and sensitivity (30, 100, 300 or 500 mA).
• Residual current type (AC, A, F or B) and the type of loads on the circuit.
• Upstream breaker rating and board layout.
• Delivery location (Muscat, Sohar, Salalah or elsewhere in the GCC) and the date you need the goods.
• Any documents you need with the quotation, such as a technical data sheet or a compliance statement.

Documents and quotation

The Legrand technical data sheet that covers 411761 is attached on this page. It gives the range table, dimensions, curves and accessories, so check its notes against your design before you order.

To request a quotation, send reference 411761, the quantity and your delivery location. Seven Star LLC is an independent supplier in Muscat and is not affiliated with the manufacturer; we will confirm availability and lead time for your order.