Chint NB3LEU RCBO 16A Type B 30mA

In-Depth Look

An RCBO combines the jobs of an MCB and an RCD in one device. Each circuit fitted with its own RCBO has its own earth leakage protection, so an earth fault on that circuit trips that device rather than a shared RCD covering several circuits.

RCD Type

RCDs come in different types, such as AC and A, which respond to different kinds of earth fault current. Chint describes the NB3LEU range as available in AC and A types, and the Amazon listing for this device does not state the type. Read the type marked on the device itself and check it against what the circuit needs before fitting.

Rating and Curve

This device is rated 16A with a B curve, 30mA sensitivity and a 10kA breaking capacity. The right rating and curve for a circuit depend on the cable, the load and the installation, so that decision is for the electrician.

Summary

The Chint NB3LEU B16 is a 16A, B curve, 30mA RCBO with a 10kA breaking capacity in a single module width. Check the RCD type marked on the device and the busbar fit with your consumer unit before buying, and have a competent electrician fit it.

How It Compares

This Chint RCBO is from the NB3LEU range. It is a 16A, B-curve device with 30mA sensitivity and a breaking capacity of 10kA. It is a single module width (1P+N) and mounts on a DIN rail. An RCBO combines overload, short-circuit and earth-leakage protection in one device, which is why the label carries several markings.

The type of residual current protection is marked on the device. Read the type on your own device and compare it with what the circuit needs, rather than relying on a product title.

The Wylex NHXS1B20 RCBO is another RCBO. If you are looking at the whole board, the Hager VML106 consumer unit is a consumer unit. Our guide to choosing a consumer unit explains how the pieces fit together.

Common Questions

What does RCBO stand for and what does it do? It stands for residual current breaker with overcurrent protection. It combines an MCB and an RCD, so one device can trip on an overload, a short circuit or earth leakage.

What does B16 mean? The 16 is the amp rating. The B is the trip curve. A B-curve device trips at lower surge currents than a C-curve device. The right curve and rating depend on the circuit, so that decision is for the electrician.

What does 30mA mean? It is the leakage current at which the device is designed to trip, which gives personal protection. Treat it as a design figure, not a promise that nobody can receive a shock.

What does 10kA mean? It is the maximum fault current the device can interrupt. The kA rating is printed on the label, and whether it suits an installation is a question for the electrician.

Can I swap one myself? Consumer unit work should be done by a competent, registered electrician. If you are unsure, do not open the board. Follow the manufacturer’s instructions.

Electrical work should be done by a competent person. Follow the manufacturer’s instructions.